ABB VADODRA PAPER 2 MAY,2004
TECHNICAL PAPER-40 QUESTION, 45- MINUTES
(1)in a ckt. We r giving voltage of 50 Hz as well as 60. then what will be
the resultant frequency.
(a)less than 50 (b)more than 60(c)in between 50 & 60
(d)none..........according to our conclusion answer will be none because if
we apply two frequency component resultatnt frequency we can not say with
such an ease.U should confirm the answer
2.In a ckt a single resistor is connected across a d.c. source, what will be
the effect on current in first resistor if we connect one more resistance in
parallel with earlier one....
Answer.. no change since it is a parallel combination.
3.why we don,t like flashover in transmission line (t-line)-
(a ) it may create earth fault(b )it reduces the life of insulator.....
Read something about flashover & puncture.
4.total no of strands in a acsr conductor is 81, then what is the no. of
conductor in its outer layer....(a)36 (b)18 (c)24.......Also read some more
on acsr.
5.Two questions based on p.u. calculation like , p.u. calculation is given
with respect to some old base and u have to calculate it with reference to
new base.
(new resistance/old)=(mva new /mva old)*(old voltage/new voltage)2.
Other question is based upon transfer of p.u calculation in transformer i.e.
how base changes when we we move from primary to secondary or like wise.read
some more on p.u calculation.
6.which table is referred for sag calculation-
(a)stringing chart......answer
7.in a R-L ckt a ac voltage is applied , such that instantaneous power is
negative for 2ms, then what will be the power factor.
(a) 9 deg, (b) 18 deg, (c) 36 Deg...........(I don't know the correct ans)
8. In an incandescent lamp
(a) luminous intensity is more than non-luminous intensity
(b) ,, ,, ,, less ,, ,,
,,
Ans: Since efficiency is less than 100%, hence ans is (b), u should confirm
it further.
9. In which motor no-load to full-load diff. is lowest
(a) series motor, (b) shunt motor, (c) Compound motor
Ans: (b)
10. In a 60Hz induction motor full load speed is 850 rpm then what is the
Synchronous speed. (a) 900 rpm, (b) 950 rpm, (c) 1600
rpm....................Ans: (a)
11. A sync. Motor is running at synch. Speed, if al of sudden D.C.
excitation is removed, then
(a) it will rotate at slip speed, (b) it will stop, (c) it will continue to
rotate at sync. Speed
Ans: (a), because actually it will acts as Induction motor.
12. A transmission line is designed for 50Hz, 440KV. If we want to transfer
power at 60Hz, 440 KV, then the power transfer capability will
(a) decrease, (b) Increase, (c)None
Ans: (a) ...as P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque
angle.
13. Increased rotor resistance in rotor ckt of induction motor is related
with
(a) high starting torque, (b) more speed variation,.....................Ans:
(a)
14. In the formulae E = 4.44 f N Ô, Ô is
(a) Avg value, (b) Rms value, (c) Maximum value.....................Ans:
(a)...[confirm it]
15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then
rms power is
.......(refer book by Edministrator on NETWORK ..)
16. Input impedence of MOSFET is
(a) more than BJT........(Ans)
17, 18. Remember truth table of AND, NOR, NAND, OR, EX-OR ETC...
19. Conversion of Binary number into Equivalent decimal No.
20. Megger is used for the measurement of (a) Insulation resistance, (b)
Conductor resistance.............Ans: (a)
21. Form factor for sinusoidal as well as DC
22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is
(a) short transmission line, (b) long, (c) medium...................Ans: (a)
23. Improvement in power factor reduces
(a) power consumed by consumer, (b) power generation, (c) both a &
b...........Ans: (c)
[Confirm it]
24. Read about field test of Series Motor...
25. No-load test for Synchronous motor, the graph is drawn
(a) stator open ckt emf Vs field
current.......................................(Ans: a)
26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating
power has a frequency (a) 50 Hz, (b) 100, (c) no oscillating power is there
in resistive ckt......Ans: (a)
27. Insulation used in transformer ___________leakage flux.
(a) increases, (b) decreases............Ans: (b)
28.After rain what happens to Insulator (a) break-down strength of Insulator
decreases, (b)Arch length reduces, ..........Ans: (b).....[Confirm it]
29.Diversity factor helps to ............(what ?)
[Read diversity factor, load factor, Reserve capacity factor in depth, with
calculation]
30. Why capacitance is shown as a Shunt element in analysis of transmission
line
(a) it is between Conductor & earth, (b) because Admittance is used for
calculation of capacitive reactance........................Ans: (a)
31. B-R-Y sequence is followed in three phase system, if phase voltage in
B-phase is Vm sin 100, then the phase voltage in R-phase would be (a) Vm
sin (-20)......Ans:(a)
32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of
ckt is (a) pure resistive ckt....................[Ans]
33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is
the time constant...........Ans: time constant = L/R = 0.5
34. In electro-dynamometer A'meter & wattmeter the type of scale is
...Ans:Non-uniform
35. For the same current carrying capacity corona loss of ACSR will be
________than copper conductor. (a) more, (b) less, (c) equal...Ans:(b)
36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor,
then what happens to the illumination, if we change the capacitance.
Ans: No change at all
37. Read about surge impendence of over-head and under-ground cable, Surge
impedence formula = sqrt(L/C)
*****[N.B] We are not mentioning the options in sequence, and do not think
that ans for the most questions is option (a). Read all options very
carefully as all are very close to each other.
QUANTITATIVE PAPER + PCM paper
45 Questions ---------45 minutes
1. About 10 quanti questions ( based on Mixture, Work etc. of very easy
type)
2. What is GDP ?
3. Vector algebra, codition for Co-planer vector etc.
4. Gravitation, geo-synchronous satellite( it's hight, orbit , radius
etc.), escape velocity, how g (gravitational accln) varies, about
gravitational potential.
5. Basic electricity and Magnetism----Biot-savart law, current carrying
conductor properties.
6. Nuclear physics, Bohr's constant, and Other theories related .
7. Problem based on VIBGYOR , how wave length and frequency is varying.
8. Questions based on Plank's Theory, E =hv
9. V=u + at , V2=u2 + 2as and W = mgh
questions based on above theory
10. Faraday's laws of electrolysis, m = Zit
11. Heat conduction problem.
12. Co lour-coding of resistor (BBROYGBVGW)
13. How velocity of light changes in different medium while frequency remain
unchanged.
14. statistics , calculation of mode, co-efficient regression (3-4
Questions)
15. f(x) = Sin x + Cos x, find the maximum value of the function.......Ans:
sqrt (2)
16. Formulae for parallel plate capacitor and force between plates.
Showing posts with label ABB Placement Paper. Show all posts
Showing posts with label ABB Placement Paper. Show all posts
Saturday, August 16, 2008
ABB - Placement Paper - 2 May 2004 - Vadodra
ABB - Placement Paper - 2 May 2004 - Vadodra
1)in a ckt. We r giving voltage of 50 Hz as well as 60. then what will be the resultant frequency.
(a)less than 50 (b)more than 60(c)in between 50 & 60
(d)none……….according to our conclusion answer will be none because if we apply two frequency component resultatnt frequency we can not say with such an ease.U should confirm the answer
2.In a ckt a single resistor is connected across a d.c. source, what will be the effect on current in first resistor if we connect one more resistance in parallel with earlier one….
Answer.. no change since it is a parallel combination.
3.why we don,t like flashover in transmission line (t-line)-
(a ) it may create earth fault(b )it reduces the life of insulator…..
Read something about flashover & puncture.
4.total no of strands in a acsr conductor is 81, then what is the no. of conductor in its outer layer….(a)36 (b)18 (c)24…….Also read some more on acsr.
5.Two questions based on p.u. calculation like , p.u. calculation is given with respect to some old base and u have to calculate it with reference to new base.
(new resistance/old)=(mva new /mva old)*(old voltage/new voltage)2.
Other question is based upon transfer of p.u calculation in transformer i.e. how base changes when we we move from primary to secondary or like wise.read some more on p.u calculation.
6.which table is referred for sag calculation-
(a)stringing chart……answer
7.in a R-L ckt a ac voltage is applied , such that instantaneous power is negative for 2ms, then what will be the power factor.
(a) 9 deg, (b) 18 deg, (c) 36 Deg………..(I don’t know the correct ans)
8. In an incandescent lamp
(a) luminous intensity is more than non-luminous intensity
(b) ,, ,, ,, less ,, ,, ,,
Ans: Since efficiency is less than 100%, hence ans is (b), u should confirm it further.
9. In which motor no-load to full-load diff. is lowest
(a) series motor, (b) shunt motor, (c) Compound motor
Ans: (b)
10. In a 60Hz induction motor full load speed is 850 rpm then what is the Synchronous speed. (a) 900 rpm, (b) 950 rpm, (c) 1600 rpm………………..Ans: (a)
11. A sync. Motor is running at synch. Speed, if al of sudden D.C. excitation is removed, then
(a) it will rotate at slip speed, (b) it will stop, (c) it will continue to rotate at sync. Speed
Ans: (a), because actually it will acts as Induction motor.
12. A transmission line is designed for 50Hz, 440KV. If we want to transfer power at 60Hz, 440 KV, then the power transfer capability will
(a) decrease, (b) Increase, (c)None
Ans: (a) …as P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque angle.
13. Increased rotor resistance in rotor ckt of induction motor is related with
(a) high starting torque, (b) more speed variation,…………………Ans: (a)
14. In the formulae E = 4.44 f N Ф, Ф is
(a) Avg value, (b) Rms value, (c) Maximum value…………………Ans: (a)…[confirm it]
15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then rms power is
…….(refer book by Edministrator on NETWORK ..)
16. Input impedence of MOSFET is
(a) more than BJT……..(Ans)
17, 18. Remember truth table of AND, NOR, NAND , OR , EX-OR ETC…
19. Conversion of Binary number into Equivalent decimal No.
20. Megger is used for the measurement of (a) Insulation resistance, (b) Conductor resistance………….Ans: (a)
21. Form factor for sinusoidal as well as DC
22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is
(a) short transmission line, (b) long, (c) medium……………….Ans: (a)
23. Improvement in power factor reduces
(a) power consumed by consumer, (b) power generation, (c) both a & b………..Ans: (c)
[Confirm it]
24. Read about field test of Series Motor…
25. No-load test for Synchronous motor, the graph is drawn
(a) stator open ckt emf Vs field current…………………………………(Ans: a)
26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating power has a frequency (a) 50 Hz, (b) 100, (c) no oscillating power is there in resistive ckt……Ans: (a)
27. Insulation used in transformer ___________leakage flux.
(a) increases, (b) decreases…………Ans: (b)
28.After rain what happens to Insulator (a) break-down strength of Insulator decreases, (b)Arch length reduces, ……….Ans: (b)…..[Confirm it]
29.Diversity factor helps to …………(what ?)
[Read diversity factor, load factor, Reserve capacity factor in depth, with calculation]
30. Why capacitance is shown as a Shunt element in analysis of transmission line
(a) it is between Conductor & earth, (b) because Admittance is used for calculation of capacitive reactance……………………Ans: (a)
31. B-R-Y sequence is followed in three phase system, if phase voltage in B-phase is Vm sin 100, then the phase voltage in R-phase would be (a) Vm sin (-20)……Ans:(a)
32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is (a) pure resistive ckt………………..[Ans]
33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is the time constant………..Ans: time constant = L/R = 0.5
34. In electro-dynamometer A’meter & wattmeter the type of scale is …Ans:Non-uniform
35. For the same current carrying capacity corona loss of ACSR will be ________than copper conductor. (a) more, (b) less, (c) equal…Ans:(b)
36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor, then what happens to the illumination, if we change the capacitance.
Ans: No change at all
37. Read about surge impendence of over-head and under-ground cable, Surge impedence formula = sqrt(L/C)
*****[N.B] We are not mentioning the options in sequence, and do not think that ans for the most questions is option (a). Read all options very carefully as all are very close to each other.
QUANTITATIVE PAPER + PCM paper
45 Questions ---------45 minutes
1. About 10 quanti questions ( based on Mixture, Work etc. of very easy type)
2. What is GDP ?
3. Vector algebra, codition for Co-planer vector etc.
4. Gravitation, geo-synchronous satellite( it’s hight, orbit , radius etc.), escape velocity, how g (gravitational accln) varies, about gravitational potential.
5. Basic electricity and Magnetism----Biot-savart law, current carrying conductor properties.
6. Nuclear physics, Bohr’s constant, and Other theories related .
7. Problem based on VIBGYOR , how wave length and frequency is varying.
8. Questions based on Plank’s Theory, E =hv
9. V=u + at , V2=u2 + 2as and W = mgh
questions based on above theory
10. Faraday’s laws of electrolysis, m = Zit
11. Heat conduction problem.
12. Co lour-coding of resistor (BBROYGBVGW)
13. How velocity of light changes in different medium while frequency remain unchanged.
14. statistics , calculation of mode, co-efficient regression (3-4 Questions)
15. f(x) = Sin x + Cos x, find the maximum value of the function…….Ans: sqrt (2)
16. Formulae for parallel plate capacitor and force between plates.
1)in a ckt. We r giving voltage of 50 Hz as well as 60. then what will be the resultant frequency.
(a)less than 50 (b)more than 60(c)in between 50 & 60
(d)none……….according to our conclusion answer will be none because if we apply two frequency component resultatnt frequency we can not say with such an ease.U should confirm the answer
2.In a ckt a single resistor is connected across a d.c. source, what will be the effect on current in first resistor if we connect one more resistance in parallel with earlier one….
Answer.. no change since it is a parallel combination.
3.why we don,t like flashover in transmission line (t-line)-
(a ) it may create earth fault(b )it reduces the life of insulator…..
Read something about flashover & puncture.
4.total no of strands in a acsr conductor is 81, then what is the no. of conductor in its outer layer….(a)36 (b)18 (c)24…….Also read some more on acsr.
5.Two questions based on p.u. calculation like , p.u. calculation is given with respect to some old base and u have to calculate it with reference to new base.
(new resistance/old)=(mva new /mva old)*(old voltage/new voltage)2.
Other question is based upon transfer of p.u calculation in transformer i.e. how base changes when we we move from primary to secondary or like wise.read some more on p.u calculation.
6.which table is referred for sag calculation-
(a)stringing chart……answer
7.in a R-L ckt a ac voltage is applied , such that instantaneous power is negative for 2ms, then what will be the power factor.
(a) 9 deg, (b) 18 deg, (c) 36 Deg………..(I don’t know the correct ans)
8. In an incandescent lamp
(a) luminous intensity is more than non-luminous intensity
(b) ,, ,, ,, less ,, ,, ,,
Ans: Since efficiency is less than 100%, hence ans is (b), u should confirm it further.
9. In which motor no-load to full-load diff. is lowest
(a) series motor, (b) shunt motor, (c) Compound motor
Ans: (b)
10. In a 60Hz induction motor full load speed is 850 rpm then what is the Synchronous speed. (a) 900 rpm, (b) 950 rpm, (c) 1600 rpm………………..Ans: (a)
11. A sync. Motor is running at synch. Speed, if al of sudden D.C. excitation is removed, then
(a) it will rotate at slip speed, (b) it will stop, (c) it will continue to rotate at sync. Speed
Ans: (a), because actually it will acts as Induction motor.
12. A transmission line is designed for 50Hz, 440KV. If we want to transfer power at 60Hz, 440 KV, then the power transfer capability will
(a) decrease, (b) Increase, (c)None
Ans: (a) …as P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque angle.
13. Increased rotor resistance in rotor ckt of induction motor is related with
(a) high starting torque, (b) more speed variation,…………………Ans: (a)
14. In the formulae E = 4.44 f N Ф, Ф is
(a) Avg value, (b) Rms value, (c) Maximum value…………………Ans: (a)…[confirm it]
15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then rms power is
…….(refer book by Edministrator on NETWORK ..)
16. Input impedence of MOSFET is
(a) more than BJT……..(Ans)
17, 18. Remember truth table of AND, NOR, NAND , OR , EX-OR ETC…
19. Conversion of Binary number into Equivalent decimal No.
20. Megger is used for the measurement of (a) Insulation resistance, (b) Conductor resistance………….Ans: (a)
21. Form factor for sinusoidal as well as DC
22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is
(a) short transmission line, (b) long, (c) medium……………….Ans: (a)
23. Improvement in power factor reduces
(a) power consumed by consumer, (b) power generation, (c) both a & b………..Ans: (c)
[Confirm it]
24. Read about field test of Series Motor…
25. No-load test for Synchronous motor, the graph is drawn
(a) stator open ckt emf Vs field current…………………………………(Ans: a)
26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating power has a frequency (a) 50 Hz, (b) 100, (c) no oscillating power is there in resistive ckt……Ans: (a)
27. Insulation used in transformer ___________leakage flux.
(a) increases, (b) decreases…………Ans: (b)
28.After rain what happens to Insulator (a) break-down strength of Insulator decreases, (b)Arch length reduces, ……….Ans: (b)…..[Confirm it]
29.Diversity factor helps to …………(what ?)
[Read diversity factor, load factor, Reserve capacity factor in depth, with calculation]
30. Why capacitance is shown as a Shunt element in analysis of transmission line
(a) it is between Conductor & earth, (b) because Admittance is used for calculation of capacitive reactance……………………Ans: (a)
31. B-R-Y sequence is followed in three phase system, if phase voltage in B-phase is Vm sin 100, then the phase voltage in R-phase would be (a) Vm sin (-20)……Ans:(a)
32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is (a) pure resistive ckt………………..[Ans]
33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is the time constant………..Ans: time constant = L/R = 0.5
34. In electro-dynamometer A’meter & wattmeter the type of scale is …Ans:Non-uniform
35. For the same current carrying capacity corona loss of ACSR will be ________than copper conductor. (a) more, (b) less, (c) equal…Ans:(b)
36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor, then what happens to the illumination, if we change the capacitance.
Ans: No change at all
37. Read about surge impendence of over-head and under-ground cable, Surge impedence formula = sqrt(L/C)
*****[N.B] We are not mentioning the options in sequence, and do not think that ans for the most questions is option (a). Read all options very carefully as all are very close to each other.
QUANTITATIVE PAPER + PCM paper
45 Questions ---------45 minutes
1. About 10 quanti questions ( based on Mixture, Work etc. of very easy type)
2. What is GDP ?
3. Vector algebra, codition for Co-planer vector etc.
4. Gravitation, geo-synchronous satellite( it’s hight, orbit , radius etc.), escape velocity, how g (gravitational accln) varies, about gravitational potential.
5. Basic electricity and Magnetism----Biot-savart law, current carrying conductor properties.
6. Nuclear physics, Bohr’s constant, and Other theories related .
7. Problem based on VIBGYOR , how wave length and frequency is varying.
8. Questions based on Plank’s Theory, E =hv
9. V=u + at , V2=u2 + 2as and W = mgh
questions based on above theory
10. Faraday’s laws of electrolysis, m = Zit
11. Heat conduction problem.
12. Co lour-coding of resistor (BBROYGBVGW)
13. How velocity of light changes in different medium while frequency remain unchanged.
14. statistics , calculation of mode, co-efficient regression (3-4 Questions)
15. f(x) = Sin x + Cos x, find the maximum value of the function…….Ans: sqrt (2)
16. Formulae for parallel plate capacitor and force between plates.
ABB - Placement Paper -1 Jan 2005
ABB - Placement Paper -1 Jan 2005
1.What would be the output of the following program.
#include
main()
{
extern int a;
printf("%d",a);;
}
int a=20;
(a) 20 (b) 0 (c) garbage value (d) error!!
2.What would be the output of the following program.
main()
{
int a[5]={2,3};
printf("\n %d %d %d",a[2],a[3],a[4]);
}
(a) garbage value (b) 2 3 3 (c) 3 2 2 (d) 0 0 0
3.What would be the output of the following program.
main()
{
inti=-3,j=2,k=0,m;
m=++i&&++j||++k;
printf("\n %d %d %d %d",i,j,k,m);
}
(a) -2 3 0 1 (b) -3 2 0 1 (c) -2 3 1 1 (d) error
4.What would be the output of the following program.
main()
{
int a,b;
a=sumdig(123);
b=sumdig(123);
printf("%d %d",a,b);
}
sumdig(int n)
{
static int s=0;
int d;
if(n!=0)
{
d=n%10;
n=(n-d)/10;
s=s+d;
sumdig(n);
}
else return(s);
}
(a) 12 6 (b) 6 12 (c) 3 15 (d) error
5.What would be the output of the following program.
#define CUBE(x) (x*x*x)
main()
{
int a,b=3;
a=CUBE(b++);
printf("\n %d %d",a,b);
}
(a) 64 4 (b) 27 4 (c) 27 6 (d) 64 6
6.What would be the output of the following program.
main()
{
const int x=get();
printf("%d",x);
}
get()
{
return(20);
}
(a) 20 (b) garbage value (c) error (d) 0
7.A function has this prototype void f1(int **x),
How will you call this function?
(a) int **a; (b) int a; (c) int *a; (d) int a=5;
f1(a); f1(&a); f1(&a); f1(&&a);
8.pointout the error, if any, in the for loop
main()
{
int l=1;
for(;;)
{
printf("%d",l++);
if(l>10)
break;
}
}
(a) The condition in the for loop is a must (b) The two semicolons should be dropped
(c) The for loop should be replaced by awhile loop (d) No error
9.Can the following piece of code be executed?
int main(void)
{
char strA[10]="compile",strB[10];
my_strcpy(strB,strA);
puts(strB);
}
char * my_strcpy(char *destination,char *source)
{
char *p=destination;
while(*source!='\0')
{
*p++=*source++;
}
*p='\0';
return destination;
}
(a) Compilation will only give a warning but will proceed to execute & will display "compile"
(b) The compilation error char *(char *,char *) differs in levels of indirection from 'int()' will occur
(c) Yes & it will print compile on the screen (d) None of the above
10.What would be the output of the following program.
#include
main()
{
char str[5]="fast";
static char *ptr_to_array = str;
printf("%s",ptr_to_array);
}
(a) Compilation will only give a warning but will proceed to execute & will display "fast"
(b) display "fast" on screen (c) will give a compilation error (d) none of the above
11.What would be the output of the following program.
main()
{
int num,*p;
num=5;
p=#
printf("%d",*p);
}
(a) 6 (b) 5 (c) junk value (d) compilation error
12.What would be the output of the following program.
main()
{
int a[3]={2,3,4};
char *p;
p=a;
p=(char *)((int *)p+1);
printf("%d",p);
}
(a) 2 (b) 0 (c) junk value (d) 3
13.What would be the output of the following program.
main()
{
int i=10;
fn(i);
printf("%d",i);
}
fn(int i)
{
return ++i;
}
(a) 10 (b) 11 (c) 12 (d) Compilation error
14. What will be the value of i & j after the loop isexecuted?
for(i=0,j=0;i<5,j<25;i++,j++)
(a) i=4,j= 24 (b) i=24,j= 24 (c) i=25,j= 25 (d) i=5,j=25
15.What would be the output of the following program.
main()
{
int i,j;
i=10;
j=sizeof(++i);
printf("%d",i);
}
(a) 11 (b) 10 (c) 4 (d) compilation error
16.What would be the output of the following program.
main()
{
int i=7;
printf("%d\n",i++*i++);
}
(a) 49 (b) 56 (c) 72 (d) compilation error
17. What will the printf print?
main()
{
char *p,*f();
p=f();
printf("f() returns:%s\n",p);
}
char *f()
{
char result[80];
strcpy(result,"anything will do");
return (result);
}
(a) f() returns: anything will do (b) f() returns:
(c) compilation error (d) The printf statement is not going to be executed
18.How many times the following program would print 'Jamboree'?
main()
{
printf("\n Jamboree");
main();
}
(a) infinite number of times (b) 32767 times
(c) 65535 times (d) till the stack does not overflow
19.Notice the error in the default statement in the code snippet below.Will it give a compilation error?
main()
{
int a=10,j;
j=fn(a);
switch(j)
{
case 30: printf("the value is 30");
break;
case 50: printf("the value is 50");
break;
default:printf("the value is not 30 or 50");
}
}
fn(int a)
{
return (++a);
}
(a) Will display "the value is 30" (b) Will display "The value is not 30 or 50"
(c) Yes a compilation error would happen
(d) No compilation errors but there will be no output on the screen
20.What would be the output of the following program.
main()
{
struct emp
{
char name[20];
int age;
float sal;
};
struct emp e = {"tiger"};
printf("\n %d %f",e.age,e.sal);
}
(a) 0 0.000000 (b) Garbage values (c) Error (d) none of the above
1.What would be the output of the following program.
#include
main()
{
extern int a;
printf("%d",a);;
}
int a=20;
(a) 20 (b) 0 (c) garbage value (d) error!!
2.What would be the output of the following program.
main()
{
int a[5]={2,3};
printf("\n %d %d %d",a[2],a[3],a[4]);
}
(a) garbage value (b) 2 3 3 (c) 3 2 2 (d) 0 0 0
3.What would be the output of the following program.
main()
{
inti=-3,j=2,k=0,m;
m=++i&&++j||++k;
printf("\n %d %d %d %d",i,j,k,m);
}
(a) -2 3 0 1 (b) -3 2 0 1 (c) -2 3 1 1 (d) error
4.What would be the output of the following program.
main()
{
int a,b;
a=sumdig(123);
b=sumdig(123);
printf("%d %d",a,b);
}
sumdig(int n)
{
static int s=0;
int d;
if(n!=0)
{
d=n%10;
n=(n-d)/10;
s=s+d;
sumdig(n);
}
else return(s);
}
(a) 12 6 (b) 6 12 (c) 3 15 (d) error
5.What would be the output of the following program.
#define CUBE(x) (x*x*x)
main()
{
int a,b=3;
a=CUBE(b++);
printf("\n %d %d",a,b);
}
(a) 64 4 (b) 27 4 (c) 27 6 (d) 64 6
6.What would be the output of the following program.
main()
{
const int x=get();
printf("%d",x);
}
get()
{
return(20);
}
(a) 20 (b) garbage value (c) error (d) 0
7.A function has this prototype void f1(int **x),
How will you call this function?
(a) int **a; (b) int a; (c) int *a; (d) int a=5;
f1(a); f1(&a); f1(&a); f1(&&a);
8.pointout the error, if any, in the for loop
main()
{
int l=1;
for(;;)
{
printf("%d",l++);
if(l>10)
break;
}
}
(a) The condition in the for loop is a must (b) The two semicolons should be dropped
(c) The for loop should be replaced by awhile loop (d) No error
9.Can the following piece of code be executed?
int main(void)
{
char strA[10]="compile",strB[10];
my_strcpy(strB,strA);
puts(strB);
}
char * my_strcpy(char *destination,char *source)
{
char *p=destination;
while(*source!='\0')
{
*p++=*source++;
}
*p='\0';
return destination;
}
(a) Compilation will only give a warning but will proceed to execute & will display "compile"
(b) The compilation error char *(char *,char *) differs in levels of indirection from 'int()' will occur
(c) Yes & it will print compile on the screen (d) None of the above
10.What would be the output of the following program.
#include
main()
{
char str[5]="fast";
static char *ptr_to_array = str;
printf("%s",ptr_to_array);
}
(a) Compilation will only give a warning but will proceed to execute & will display "fast"
(b) display "fast" on screen (c) will give a compilation error (d) none of the above
11.What would be the output of the following program.
main()
{
int num,*p;
num=5;
p=#
printf("%d",*p);
}
(a) 6 (b) 5 (c) junk value (d) compilation error
12.What would be the output of the following program.
main()
{
int a[3]={2,3,4};
char *p;
p=a;
p=(char *)((int *)p+1);
printf("%d",p);
}
(a) 2 (b) 0 (c) junk value (d) 3
13.What would be the output of the following program.
main()
{
int i=10;
fn(i);
printf("%d",i);
}
fn(int i)
{
return ++i;
}
(a) 10 (b) 11 (c) 12 (d) Compilation error
14. What will be the value of i & j after the loop isexecuted?
for(i=0,j=0;i<5,j<25;i++,j++)
(a) i=4,j= 24 (b) i=24,j= 24 (c) i=25,j= 25 (d) i=5,j=25
15.What would be the output of the following program.
main()
{
int i,j;
i=10;
j=sizeof(++i);
printf("%d",i);
}
(a) 11 (b) 10 (c) 4 (d) compilation error
16.What would be the output of the following program.
main()
{
int i=7;
printf("%d\n",i++*i++);
}
(a) 49 (b) 56 (c) 72 (d) compilation error
17. What will the printf print?
main()
{
char *p,*f();
p=f();
printf("f() returns:%s\n",p);
}
char *f()
{
char result[80];
strcpy(result,"anything will do");
return (result);
}
(a) f() returns: anything will do (b) f() returns:
(c) compilation error (d) The printf statement is not going to be executed
18.How many times the following program would print 'Jamboree'?
main()
{
printf("\n Jamboree");
main();
}
(a) infinite number of times (b) 32767 times
(c) 65535 times (d) till the stack does not overflow
19.Notice the error in the default statement in the code snippet below.Will it give a compilation error?
main()
{
int a=10,j;
j=fn(a);
switch(j)
{
case 30: printf("the value is 30");
break;
case 50: printf("the value is 50");
break;
default:printf("the value is not 30 or 50");
}
}
fn(int a)
{
return (++a);
}
(a) Will display "the value is 30" (b) Will display "The value is not 30 or 50"
(c) Yes a compilation error would happen
(d) No compilation errors but there will be no output on the screen
20.What would be the output of the following program.
main()
{
struct emp
{
char name[20];
int age;
float sal;
};
struct emp e = {"tiger"};
printf("\n %d %f",e.age,e.sal);
}
(a) 0 0.000000 (b) Garbage values (c) Error (d) none of the above
ABB VADODRA PAPER 2 MAY,2004
ABB VADODRA PAPER 2 MAY,2004
TECHNICAL PAPER-40 QUESTION, 45- MINUTES
(1)in a ckt. We r giving voltage of 50 Hz as well as 60. then what will be
the resultant frequency.
(a)less than 50 (b)more than 60(c)in between 50 & 60
(d)none..........according to our conclusion answer will be none because if
we apply two frequency component resultatnt frequency we can not say with
such an ease.U should confirm the answer
2.In a ckt a single resistor is connected across a d.c. source, what will be
the effect on current in first resistor if we connect one more resistance in
parallel with earlier one....
Answer.. no change since it is a parallel combination.
3.why we don,t like flashover in transmission line (t-line)-
(a ) it may create earth fault(b )it reduces the life of insulator.....
Read something about flashover & puncture.
4.total no of strands in a acsr conductor is 81, then what is the no. of
conductor in its outer layer....(a)36 (b)18 (c)24.......Also read some more
on acsr.
5.Two questions based on p.u. calculation like , p.u. calculation is given
with respect to some old base and u have to calculate it with reference to
new base.
(new resistance/old)=(mva new /mva old)*(old voltage/new voltage)2.
Other question is based upon transfer of p.u calculation in transformer i.e.
how base changes when we we move from primary to secondary or like wise.read
some more on p.u calculation.
6.which table is referred for sag calculation-
(a)stringing chart......answer
7.in a R-L ckt a ac voltage is applied , such that instantaneous power is
negative for 2ms, then what will be the power factor.
(a) 9 deg, (b) 18 deg, (c) 36 Deg...........(I don't know the correct ans)
8. In an incandescent lamp
(a) luminous intensity is more than non-luminous intensity
(b) ,, ,, ,, less ,, ,,
,,
Ans: Since efficiency is less than 100%, hence ans is (b), u should confirm
it further.
9. In which motor no-load to full-load diff. is lowest
(a) series motor, (b) shunt motor, (c) Compound motor
Ans: (b)
10. In a 60Hz induction motor full load speed is 850 rpm then what is the
Synchronous speed. (a) 900 rpm, (b) 950 rpm, (c) 1600
rpm....................Ans: (a)
11. A sync. Motor is running at synch. Speed, if al of sudden D.C.
excitation is removed, then
(a) it will rotate at slip speed, (b) it will stop, (c) it will continue to
rotate at sync. Speed
Ans: (a), because actually it will acts as Induction motor.
12. A transmission line is designed for 50Hz, 440KV. If we want to transfer
power at 60Hz, 440 KV, then the power transfer capability will
(a) decrease, (b) Increase, (c)None
Ans: (a) ...as P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque
angle.
13. Increased rotor resistance in rotor ckt of induction motor is related
with
(a) high starting torque, (b) more speed variation,.....................Ans:
(a)
14. In the formulae E = 4.44 f N Ô, Ô is
(a) Avg value, (b) Rms value, (c) Maximum value.....................Ans:
(a)...[confirm it]
15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then
rms power is
.......(refer book by Edministrator on NETWORK ..)
16. Input impedence of MOSFET is
(a) more than BJT........(Ans)
17, 18. Remember truth table of AND, NOR, NAND, OR, EX-OR ETC...
19. Conversion of Binary number into Equivalent decimal No.
20. Megger is used for the measurement of (a) Insulation resistance, (b)
Conductor resistance.............Ans: (a)
21. Form factor for sinusoidal as well as DC
22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is
(a) short transmission line, (b) long, (c) medium...................Ans: (a)
23. Improvement in power factor reduces
(a) power consumed by consumer, (b) power generation, (c) both a &
b...........Ans: (c)
[Confirm it]
24. Read about field test of Series Motor...
25. No-load test for Synchronous motor, the graph is drawn
(a) stator open ckt emf Vs field
current.......................................(Ans: a)
26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating
power has a frequency (a) 50 Hz, (b) 100, (c) no oscillating power is there
in resistive ckt......Ans: (a)
27. Insulation used in transformer ___________leakage flux.
(a) increases, (b) decreases............Ans: (b)
28.After rain what happens to Insulator (a) break-down strength of Insulator
decreases, (b)Arch length reduces, ..........Ans: (b).....[Confirm it]
29.Diversity factor helps to ............(what ?)
[Read diversity factor, load factor, Reserve capacity factor in depth, with
calculation]
30. Why capacitance is shown as a Shunt element in analysis of transmission
line
(a) it is between Conductor & earth, (b) because Admittance is used for
calculation of capacitive reactance........................Ans: (a)
31. B-R-Y sequence is followed in three phase system, if phase voltage in
B-phase is Vm sin 100, then the phase voltage in R-phase would be (a) Vm
sin (-20)......Ans:(a)
32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of
ckt is (a) pure resistive ckt....................[Ans]
33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is
the time constant...........Ans: time constant = L/R = 0.5
34. In electro-dynamometer A'meter & wattmeter the type of scale is
...Ans:Non-uniform
35. For the same current carrying capacity corona loss of ACSR will be
________than copper conductor. (a) more, (b) less, (c) equal...Ans:(b)
36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor,
then what happens to the illumination, if we change the capacitance.
Ans: No change at all
37. Read about surge impendence of over-head and under-ground cable, Surge
impedence formula = sqrt(L/C)
*****[N.B] We are not mentioning the options in sequence, and do not think
that ans for the most questions is option (a). Read all options very
carefully as all are very close to each other.
QUANTITATIVE PAPER + PCM paper
45 Questions ---------45 minutes
1. About 10 quanti questions ( based on Mixture, Work etc. of very easy
type)
2. What is GDP ?
3. Vector algebra, codition for Co-planer vector etc.
4. Gravitation, geo-synchronous satellite( it's hight, orbit , radius
etc.), escape velocity, how g (gravitational accln) varies, about
gravitational potential.
5. Basic electricity and Magnetism----Biot-savart law, current carrying
conductor properties.
6. Nuclear physics, Bohr's constant, and Other theories related .
7. Problem based on VIBGYOR , how wave length and frequency is varying.
8. Questions based on Plank's Theory, E =hv
9. V=u + at , V2=u2 + 2as and W = mgh
questions based on above theory
10. Faraday's laws of electrolysis, m = Zit
11. Heat conduction problem.
12. Co lour-coding of resistor (BBROYGBVGW)
13. How velocity of light changes in different medium while frequency remain
unchanged.
14. statistics , calculation of mode, co-efficient regression (3-4
Questions)
15. f(x) = Sin x + Cos x, find the maximum value of the function.......Ans:
sqrt (2)
16. Formulae for parallel plate capacitor and force between plates.
TECHNICAL PAPER-40 QUESTION, 45- MINUTES
(1)in a ckt. We r giving voltage of 50 Hz as well as 60. then what will be
the resultant frequency.
(a)less than 50 (b)more than 60(c)in between 50 & 60
(d)none..........according to our conclusion answer will be none because if
we apply two frequency component resultatnt frequency we can not say with
such an ease.U should confirm the answer
2.In a ckt a single resistor is connected across a d.c. source, what will be
the effect on current in first resistor if we connect one more resistance in
parallel with earlier one....
Answer.. no change since it is a parallel combination.
3.why we don,t like flashover in transmission line (t-line)-
(a ) it may create earth fault(b )it reduces the life of insulator.....
Read something about flashover & puncture.
4.total no of strands in a acsr conductor is 81, then what is the no. of
conductor in its outer layer....(a)36 (b)18 (c)24.......Also read some more
on acsr.
5.Two questions based on p.u. calculation like , p.u. calculation is given
with respect to some old base and u have to calculate it with reference to
new base.
(new resistance/old)=(mva new /mva old)*(old voltage/new voltage)2.
Other question is based upon transfer of p.u calculation in transformer i.e.
how base changes when we we move from primary to secondary or like wise.read
some more on p.u calculation.
6.which table is referred for sag calculation-
(a)stringing chart......answer
7.in a R-L ckt a ac voltage is applied , such that instantaneous power is
negative for 2ms, then what will be the power factor.
(a) 9 deg, (b) 18 deg, (c) 36 Deg...........(I don't know the correct ans)
8. In an incandescent lamp
(a) luminous intensity is more than non-luminous intensity
(b) ,, ,, ,, less ,, ,,
,,
Ans: Since efficiency is less than 100%, hence ans is (b), u should confirm
it further.
9. In which motor no-load to full-load diff. is lowest
(a) series motor, (b) shunt motor, (c) Compound motor
Ans: (b)
10. In a 60Hz induction motor full load speed is 850 rpm then what is the
Synchronous speed. (a) 900 rpm, (b) 950 rpm, (c) 1600
rpm....................Ans: (a)
11. A sync. Motor is running at synch. Speed, if al of sudden D.C.
excitation is removed, then
(a) it will rotate at slip speed, (b) it will stop, (c) it will continue to
rotate at sync. Speed
Ans: (a), because actually it will acts as Induction motor.
12. A transmission line is designed for 50Hz, 440KV. If we want to transfer
power at 60Hz, 440 KV, then the power transfer capability will
(a) decrease, (b) Increase, (c)None
Ans: (a) ...as P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque
angle.
13. Increased rotor resistance in rotor ckt of induction motor is related
with
(a) high starting torque, (b) more speed variation,.....................Ans:
(a)
14. In the formulae E = 4.44 f N Ô, Ô is
(a) Avg value, (b) Rms value, (c) Maximum value.....................Ans:
(a)...[confirm it]
15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then
rms power is
.......(refer book by Edministrator on NETWORK ..)
16. Input impedence of MOSFET is
(a) more than BJT........(Ans)
17, 18. Remember truth table of AND, NOR, NAND, OR, EX-OR ETC...
19. Conversion of Binary number into Equivalent decimal No.
20. Megger is used for the measurement of (a) Insulation resistance, (b)
Conductor resistance.............Ans: (a)
21. Form factor for sinusoidal as well as DC
22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is
(a) short transmission line, (b) long, (c) medium...................Ans: (a)
23. Improvement in power factor reduces
(a) power consumed by consumer, (b) power generation, (c) both a &
b...........Ans: (c)
[Confirm it]
24. Read about field test of Series Motor...
25. No-load test for Synchronous motor, the graph is drawn
(a) stator open ckt emf Vs field
current.......................................(Ans: a)
26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating
power has a frequency (a) 50 Hz, (b) 100, (c) no oscillating power is there
in resistive ckt......Ans: (a)
27. Insulation used in transformer ___________leakage flux.
(a) increases, (b) decreases............Ans: (b)
28.After rain what happens to Insulator (a) break-down strength of Insulator
decreases, (b)Arch length reduces, ..........Ans: (b).....[Confirm it]
29.Diversity factor helps to ............(what ?)
[Read diversity factor, load factor, Reserve capacity factor in depth, with
calculation]
30. Why capacitance is shown as a Shunt element in analysis of transmission
line
(a) it is between Conductor & earth, (b) because Admittance is used for
calculation of capacitive reactance........................Ans: (a)
31. B-R-Y sequence is followed in three phase system, if phase voltage in
B-phase is Vm sin 100, then the phase voltage in R-phase would be (a) Vm
sin (-20)......Ans:(a)
32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of
ckt is (a) pure resistive ckt....................[Ans]
33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is
the time constant...........Ans: time constant = L/R = 0.5
34. In electro-dynamometer A'meter & wattmeter the type of scale is
...Ans:Non-uniform
35. For the same current carrying capacity corona loss of ACSR will be
________than copper conductor. (a) more, (b) less, (c) equal...Ans:(b)
36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor,
then what happens to the illumination, if we change the capacitance.
Ans: No change at all
37. Read about surge impendence of over-head and under-ground cable, Surge
impedence formula = sqrt(L/C)
*****[N.B] We are not mentioning the options in sequence, and do not think
that ans for the most questions is option (a). Read all options very
carefully as all are very close to each other.
QUANTITATIVE PAPER + PCM paper
45 Questions ---------45 minutes
1. About 10 quanti questions ( based on Mixture, Work etc. of very easy
type)
2. What is GDP ?
3. Vector algebra, codition for Co-planer vector etc.
4. Gravitation, geo-synchronous satellite( it's hight, orbit , radius
etc.), escape velocity, how g (gravitational accln) varies, about
gravitational potential.
5. Basic electricity and Magnetism----Biot-savart law, current carrying
conductor properties.
6. Nuclear physics, Bohr's constant, and Other theories related .
7. Problem based on VIBGYOR , how wave length and frequency is varying.
8. Questions based on Plank's Theory, E =hv
9. V=u + at , V2=u2 + 2as and W = mgh
questions based on above theory
10. Faraday's laws of electrolysis, m = Zit
11. Heat conduction problem.
12. Co lour-coding of resistor (BBROYGBVGW)
13. How velocity of light changes in different medium while frequency remain
unchanged.
14. statistics , calculation of mode, co-efficient regression (3-4
Questions)
15. f(x) = Sin x + Cos x, find the maximum value of the function.......Ans:
sqrt (2)
16. Formulae for parallel plate capacitor and force between plates.
ABB VADODRA PAPER 2 MAY,2004
ABB VADODRA PAPER 2 MAY,2004
TECHNICAL PAPER-40 QUESTION, 45- MINUTES
(1)in a ckt. We r giving voltage of 50 Hz as well as 60. then what will be the resultant frequency.
(a)less than 50 (b)more than 60(c)in between 50 & 60
(d)none..........according to our conclusion answer will be none because if we apply two frequency component resultatnt frequency we can not say with such an ease.U should confirm the answer
2.In a ckt a single resistor is connected across a d.c. source, what will be the effect on current in first resistor if we connect one more resistance in parallel with earlier one....
Answer.. no change since it is a parallel combination.
3.why we don,t like flashover in transmission line (t-line)- (a ) it may create earth fault(b )it reduces the life of insulator.....
Read something about flashover & puncture.
4.total no of strands in a acsr conductor is 81, then what is the no. of conductor in its outer layer....(a)36 (b)18 (c)24.......Also read some more on acsr.
5.Two questions based on p.u. calculation like , p.u. calculation is given with respect to some old base and u have to calculate it with reference to new base. (new resistance/old)=(mva new /mva old)*(old voltage/new voltage)2.
Other question is based upon transfer of p.u calculation in transformer i.e. how base changes when we we move from primary to secondary or like wise.read some more on p.u calculation.
6.which table is referred for sag calculation-
(a)stringing chart......answer
7.in a R-L ckt a ac voltage is applied , such that instantaneous power is negative for 2ms, then what will be the power factor.
(a) 9 deg, (b) 18 deg, (c) 36 Deg...........(I don't know the correct ans)
8. In an incandescent lamp
(a) luminous intensity is more than non-luminous intensity
(b) ,, ,, ,, less ,, ,, ,,
Ans: Since efficiency is less than 100%, hence ans is (b), u should confirm
it further.
9. In which motor no-load to full-load diff. is lowest
(a) series motor, (b) shunt motor, (c) Compound motor
Ans: (b)
10. In a 60Hz induction motor full load speed is 850 rpm then what is the Synchronous speed. (a) 900 rpm, (b) 950 rpm, (c) 1600
rpm....................Ans: (a)
11. A sync. Motor is running at synch. Speed, if al of sudden D.C. excitation is removed, then
(a) it will rotate at slip speed, (b) it will stop, (c) it will continue to rotate at sync. Speed
Ans: (a), because actually it will acts as Induction motor.
12. A transmission line is designed for 50Hz, 440KV. If we want to transfer power at 60Hz, 440 KV, then the power transfer capability will
(a) decrease, (b) Increase, (c)None
Ans: (a) ...as P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque
angle.
13. Increased rotor resistance in rotor ckt of induction motor is related with
(a) high starting torque, (b) more speed variation,.....................Ans:
(a)
14. In the formulae E = 4.44 f N Ô, Ô is
(a) Avg value, (b) Rms value, (c) Maximum value.....................Ans:
(a)...[confirm it]
15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then rms power is
.......(refer book by Edministrator on NETWORK ..)
16. Input impedence of MOSFET is
(a) more than BJT........(Ans)
17, 18. Remember truth table of AND, NOR, NAND, OR, EX-OR ETC...
19. Conversion of Binary number into Equivalent decimal No.
20. Megger is used for the measurement of (a) Insulation resistance, (b)
Conductor resistance.............Ans: (a)
21. Form factor for sinusoidal as well as DC
22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is
(a) short transmission line, (b) long, (c) medium...................Ans: (a)
23. Improvement in power factor reduces
(a) power consumed by consumer, (b) power generation, (c) both a &
b...........Ans: (c)
[Confirm it]
24. Read about field test of Series Motor...
25. No-load test for Synchronous motor, the graph is drawn
(a) stator open ckt emf Vs field
current.......................................(Ans: a)
26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating power has a frequency (a) 50 Hz, (b) 100, (c) no oscillating power is there in resistive ckt......Ans: (a)
27. Insulation used in transformer ___________leakage flux.
(a) increases, (b) decreases............Ans: (b)
28.After rain what happens to Insulator (a) break-down strength of Insulator decreases, (b)Arch length reduces, ..........Ans: (b).....[Confirm it]
29.Diversity factor helps to ............(what ?) [Read diversity factor, load factor, Reserve capacity factor in depth, with
calculation]
30. Why capacitance is shown as a Shunt element in analysis of transmission line
(a) it is between Conductor & earth, (b) because Admittance is used for calculation of capacitive reactance........................Ans: (a)
31. B-R-Y sequence is followed in three phase system, if phase voltage in B-phase is Vm sin 100, then the phase voltage in R-phase would be (a) Vm sin (-20)
Ans:(a)
32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is (a) pure resistive ckt
[Ans]
33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is the time constant...........Ans: time constant = L/R = 0.5
34. In electro-dynamometer A'meter & wattmeter the type of scale is
Ans:Non-uniform
35. For the same current carrying capacity corona loss of ACSR will be ________than copper conductor.
(a) more, (b) less, (c) equal.
Ans:(b)
36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor, then what happens to the illumination, if we change the capacitance.
Ans: No change at all
37. Read about surge impendence of over-head and under-ground cable, Surge impedence formula = sqrt(L/C)
[N.B] We are not mentioning the options in sequence, and do not think that ans for the most questions is option (a). Read all options very carefully as all are very close to each other.
QUANTITATIVE PAPER + PCM paper
45 Questions ---------45 minutes
1. About 10 quanti questions ( based on Mixture, Work etc. of very easy type)
2. What is GDP ?
3. Vector algebra, codition for Co-planer vector etc.
4. Gravitation, geo-synchronous satellite( it's hight, orbit , radius
etc.), escape velocity, how g (gravitational accln) varies, about gravitational potential.
5. Basic electricity and Magnetism----Biot-savart law, current carrying conductor properties.
6. Nuclear physics, Bohr's constant, and Other theories related .
7. Problem based on VIBGYOR , how wave length and frequency is varying.
8. Questions based on Plank's Theory, E =hv
9. V=u + at , V2=u2 + 2as and W = mgh questions based on above theory
10. Faraday's laws of electrolysis, m = Zit
11. Heat conduction problem.
12. Co lour-coding of resistor (BBROYGBVGW)
13. How velocity of light changes in different medium while frequency remain unchanged.
14. statistics , calculation of mode, co-efficient regression (3-4 Questions)
15. f(x) = Sin x + Cos x, find the maximum value of the function.......Ans: sqrt (2)
16. Formulae for parallel plate capacitor and force between plates.
TECHNICAL PAPER-40 QUESTION, 45- MINUTES
(1)in a ckt. We r giving voltage of 50 Hz as well as 60. then what will be the resultant frequency.
(a)less than 50 (b)more than 60(c)in between 50 & 60
(d)none..........according to our conclusion answer will be none because if we apply two frequency component resultatnt frequency we can not say with such an ease.U should confirm the answer
2.In a ckt a single resistor is connected across a d.c. source, what will be the effect on current in first resistor if we connect one more resistance in parallel with earlier one....
Answer.. no change since it is a parallel combination.
3.why we don,t like flashover in transmission line (t-line)- (a ) it may create earth fault(b )it reduces the life of insulator.....
Read something about flashover & puncture.
4.total no of strands in a acsr conductor is 81, then what is the no. of conductor in its outer layer....(a)36 (b)18 (c)24.......Also read some more on acsr.
5.Two questions based on p.u. calculation like , p.u. calculation is given with respect to some old base and u have to calculate it with reference to new base. (new resistance/old)=(mva new /mva old)*(old voltage/new voltage)2.
Other question is based upon transfer of p.u calculation in transformer i.e. how base changes when we we move from primary to secondary or like wise.read some more on p.u calculation.
6.which table is referred for sag calculation-
(a)stringing chart......answer
7.in a R-L ckt a ac voltage is applied , such that instantaneous power is negative for 2ms, then what will be the power factor.
(a) 9 deg, (b) 18 deg, (c) 36 Deg...........(I don't know the correct ans)
8. In an incandescent lamp
(a) luminous intensity is more than non-luminous intensity
(b) ,, ,, ,, less ,, ,, ,,
Ans: Since efficiency is less than 100%, hence ans is (b), u should confirm
it further.
9. In which motor no-load to full-load diff. is lowest
(a) series motor, (b) shunt motor, (c) Compound motor
Ans: (b)
10. In a 60Hz induction motor full load speed is 850 rpm then what is the Synchronous speed. (a) 900 rpm, (b) 950 rpm, (c) 1600
rpm....................Ans: (a)
11. A sync. Motor is running at synch. Speed, if al of sudden D.C. excitation is removed, then
(a) it will rotate at slip speed, (b) it will stop, (c) it will continue to rotate at sync. Speed
Ans: (a), because actually it will acts as Induction motor.
12. A transmission line is designed for 50Hz, 440KV. If we want to transfer power at 60Hz, 440 KV, then the power transfer capability will
(a) decrease, (b) Increase, (c)None
Ans: (a) ...as P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque
angle.
13. Increased rotor resistance in rotor ckt of induction motor is related with
(a) high starting torque, (b) more speed variation,.....................Ans:
(a)
14. In the formulae E = 4.44 f N Ô, Ô is
(a) Avg value, (b) Rms value, (c) Maximum value.....................Ans:
(a)...[confirm it]
15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then rms power is
.......(refer book by Edministrator on NETWORK ..)
16. Input impedence of MOSFET is
(a) more than BJT........(Ans)
17, 18. Remember truth table of AND, NOR, NAND, OR, EX-OR ETC...
19. Conversion of Binary number into Equivalent decimal No.
20. Megger is used for the measurement of (a) Insulation resistance, (b)
Conductor resistance.............Ans: (a)
21. Form factor for sinusoidal as well as DC
22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is
(a) short transmission line, (b) long, (c) medium...................Ans: (a)
23. Improvement in power factor reduces
(a) power consumed by consumer, (b) power generation, (c) both a &
b...........Ans: (c)
[Confirm it]
24. Read about field test of Series Motor...
25. No-load test for Synchronous motor, the graph is drawn
(a) stator open ckt emf Vs field
current.......................................(Ans: a)
26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating power has a frequency (a) 50 Hz, (b) 100, (c) no oscillating power is there in resistive ckt......Ans: (a)
27. Insulation used in transformer ___________leakage flux.
(a) increases, (b) decreases............Ans: (b)
28.After rain what happens to Insulator (a) break-down strength of Insulator decreases, (b)Arch length reduces, ..........Ans: (b).....[Confirm it]
29.Diversity factor helps to ............(what ?) [Read diversity factor, load factor, Reserve capacity factor in depth, with
calculation]
30. Why capacitance is shown as a Shunt element in analysis of transmission line
(a) it is between Conductor & earth, (b) because Admittance is used for calculation of capacitive reactance........................Ans: (a)
31. B-R-Y sequence is followed in three phase system, if phase voltage in B-phase is Vm sin 100, then the phase voltage in R-phase would be (a) Vm sin (-20)
Ans:(a)
32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is (a) pure resistive ckt
[Ans]
33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is the time constant...........Ans: time constant = L/R = 0.5
34. In electro-dynamometer A'meter & wattmeter the type of scale is
Ans:Non-uniform
35. For the same current carrying capacity corona loss of ACSR will be ________than copper conductor.
(a) more, (b) less, (c) equal.
Ans:(b)
36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor, then what happens to the illumination, if we change the capacitance.
Ans: No change at all
37. Read about surge impendence of over-head and under-ground cable, Surge impedence formula = sqrt(L/C)
[N.B] We are not mentioning the options in sequence, and do not think that ans for the most questions is option (a). Read all options very carefully as all are very close to each other.
QUANTITATIVE PAPER + PCM paper
45 Questions ---------45 minutes
1. About 10 quanti questions ( based on Mixture, Work etc. of very easy type)
2. What is GDP ?
3. Vector algebra, codition for Co-planer vector etc.
4. Gravitation, geo-synchronous satellite( it's hight, orbit , radius
etc.), escape velocity, how g (gravitational accln) varies, about gravitational potential.
5. Basic electricity and Magnetism----Biot-savart law, current carrying conductor properties.
6. Nuclear physics, Bohr's constant, and Other theories related .
7. Problem based on VIBGYOR , how wave length and frequency is varying.
8. Questions based on Plank's Theory, E =hv
9. V=u + at , V2=u2 + 2as and W = mgh questions based on above theory
10. Faraday's laws of electrolysis, m = Zit
11. Heat conduction problem.
12. Co lour-coding of resistor (BBROYGBVGW)
13. How velocity of light changes in different medium while frequency remain unchanged.
14. statistics , calculation of mode, co-efficient regression (3-4 Questions)
15. f(x) = Sin x + Cos x, find the maximum value of the function.......Ans: sqrt (2)
16. Formulae for parallel plate capacitor and force between plates.
ABB - Placement Paper -1 Jan 2005
ABB - Placement Paper -1 Jan 2005
1.What would be the output of the following program.
#include
main()
{
extern int a;
printf("%d",a);;
}
int a=20;
(a) 20 (b) 0 (c) garbage value (d) error!!
2.What would be the output of the following program.
main()
{
int a[5]={2,3};
printf("\n %d %d %d",a[2],a[3],a[4]);
}
(a) garbage value (b) 2 3 3 (c) 3 2 2 (d) 0 0 0
3.What would be the output of the following program.
main()
{
inti=-3,j=2,k=0,m;
m=++i&&++j||++k;
printf("\n %d %d %d %d",i,j,k,m);
}
(a) -2 3 0 1 (b) -3 2 0 1 (c) -2 3 1 1 (d) error
4.What would be the output of the following program.
main()
{
int a,b;
a=sumdig(123);
b=sumdig(123);
printf("%d %d",a,b);
}
sumdig(int n)
{
static int s=0;
int d;
if(n!=0)
{
d=n%10;
n=(n-d)/10;
s=s+d;
sumdig(n);
}
else return(s);
}
(a) 12 6 (b) 6 12 (c) 3 15 (d) error
5.What would be the output of the following program.
#define CUBE(x) (x*x*x)
main()
{
int a,b=3;
a=CUBE(b++);
printf("\n %d %d",a,b);
}
(a) 64 4 (b) 27 4 (c) 27 6 (d) 64 6
6.What would be the output of the following program.
main()
{
const int x=get();
printf("%d",x);
}
get()
{
return(20);
}
(a) 20 (b) garbage value (c) error (d) 0
7.A function has this prototype void f1(int **x),
How will you call this function?
(a) int **a; (b) int a; (c) int *a; (d) int a=5;
f1(a); f1(&a); f1(&a); f1(&&a);
8.pointout the error, if any, in the for loop
main()
{
int l=1;
for(;;)
{
printf("%d",l++);
if(l>10)
break;
}
}
(a) The condition in the for loop is a must (b) The two semicolons should be dropped
(c) The for loop should be replaced by awhile loop (d) No error
9.Can the following piece of code be executed?
int main(void)
{
char strA[10]="compile",strB[10];
my_strcpy(strB,strA);
puts(strB);
}
char * my_strcpy(char *destination,char *source)
{
char *p=destination;
while(*source!='\0')
{
*p++=*source++;
}
*p='\0';
return destination;
}
(a) Compilation will only give a warning but will proceed to execute & will display "compile"
(b) The compilation error char *(char *,char *) differs in levels of indirection from 'int()' will occur
(c) Yes & it will print compile on the screen (d) None of the above
10.What would be the output of the following program.
#include
main()
{
char str[5]="fast";
static char *ptr_to_array = str;
printf("%s",ptr_to_array);
}
(a) Compilation will only give a warning but will proceed to execute & will display "fast"
(b) display "fast" on screen (c) will give a compilation error (d) none of the above
11.What would be the output of the following program.
main()
{
int num,*p;
num=5;
p=#
printf("%d",*p);
}
(a) 6 (b) 5 (c) junk value (d) compilation error
12.What would be the output of the following program.
main()
{
int a[3]={2,3,4};
char *p;
p=a;
p=(char *)((int *)p+1);
printf("%d",p);
}
(a) 2 (b) 0 (c) junk value (d) 3
13.What would be the output of the following program.
main()
{
int i=10;
fn(i);
printf("%d",i);
}
fn(int i)
{
return ++i;
}
(a) 10 (b) 11 (c) 12 (d) Compilation error
14. What will be the value of i & j after the loop isexecuted?
for(i=0,j=0;i<5,j<25;i++,j++)
(a) i=4,j= 24 (b) i=24,j= 24 (c) i=25,j= 25 (d) i=5,j=25
15.What would be the output of the following program.
main()
{
int i,j;
i=10;
j=sizeof(++i);
printf("%d",i);
}
(a) 11 (b) 10 (c) 4 (d) compilation error
16.What would be the output of the following program.
main()
{
int i=7;
printf("%d\n",i++*i++);
}
(a) 49 (b) 56 (c) 72 (d) compilation error
17. What will the printf print?
main()
{
char *p,*f();
p=f();
printf("f() returns:%s\n",p);
}
char *f()
{
char result[80];
strcpy(result,"anything will do");
return (result);
}
(a) f() returns: anything will do (b) f() returns:
(c) compilation error (d) The printf statement is not going to be executed
18.How many times the following program would print 'Jamboree'?
main()
{
printf("\n Jamboree");
main();
}
(a) infinite number of times (b) 32767 times
(c) 65535 times (d) till the stack does not overflow
19.Notice the error in the default statement in the code snippet below.Will it give a compilation error?
main()
{
int a=10,j;
j=fn(a);
switch(j)
{
case 30: printf("the value is 30");
break;
case 50: printf("the value is 50");
break;
default:printf("the value is not 30 or 50");
}
}
fn(int a)
{
return (++a);
}
(a) Will display "the value is 30" (b) Will display "The value is not 30 or 50"
(c) Yes a compilation error would happen
(d) No compilation errors but there will be no output on the screen
20.What would be the output of the following program.
main()
{
struct emp
{
char name[20];
int age;
float sal;
};
struct emp e = {"tiger"};
printf("\n %d %f",e.age,e.sal);
}
(a) 0 0.000000 (b) Garbage values (c) Error (d) none of the above
1.What would be the output of the following program.
#include
main()
{
extern int a;
printf("%d",a);;
}
int a=20;
(a) 20 (b) 0 (c) garbage value (d) error!!
2.What would be the output of the following program.
main()
{
int a[5]={2,3};
printf("\n %d %d %d",a[2],a[3],a[4]);
}
(a) garbage value (b) 2 3 3 (c) 3 2 2 (d) 0 0 0
3.What would be the output of the following program.
main()
{
inti=-3,j=2,k=0,m;
m=++i&&++j||++k;
printf("\n %d %d %d %d",i,j,k,m);
}
(a) -2 3 0 1 (b) -3 2 0 1 (c) -2 3 1 1 (d) error
4.What would be the output of the following program.
main()
{
int a,b;
a=sumdig(123);
b=sumdig(123);
printf("%d %d",a,b);
}
sumdig(int n)
{
static int s=0;
int d;
if(n!=0)
{
d=n%10;
n=(n-d)/10;
s=s+d;
sumdig(n);
}
else return(s);
}
(a) 12 6 (b) 6 12 (c) 3 15 (d) error
5.What would be the output of the following program.
#define CUBE(x) (x*x*x)
main()
{
int a,b=3;
a=CUBE(b++);
printf("\n %d %d",a,b);
}
(a) 64 4 (b) 27 4 (c) 27 6 (d) 64 6
6.What would be the output of the following program.
main()
{
const int x=get();
printf("%d",x);
}
get()
{
return(20);
}
(a) 20 (b) garbage value (c) error (d) 0
7.A function has this prototype void f1(int **x),
How will you call this function?
(a) int **a; (b) int a; (c) int *a; (d) int a=5;
f1(a); f1(&a); f1(&a); f1(&&a);
8.pointout the error, if any, in the for loop
main()
{
int l=1;
for(;;)
{
printf("%d",l++);
if(l>10)
break;
}
}
(a) The condition in the for loop is a must (b) The two semicolons should be dropped
(c) The for loop should be replaced by awhile loop (d) No error
9.Can the following piece of code be executed?
int main(void)
{
char strA[10]="compile",strB[10];
my_strcpy(strB,strA);
puts(strB);
}
char * my_strcpy(char *destination,char *source)
{
char *p=destination;
while(*source!='\0')
{
*p++=*source++;
}
*p='\0';
return destination;
}
(a) Compilation will only give a warning but will proceed to execute & will display "compile"
(b) The compilation error char *(char *,char *) differs in levels of indirection from 'int()' will occur
(c) Yes & it will print compile on the screen (d) None of the above
10.What would be the output of the following program.
#include
main()
{
char str[5]="fast";
static char *ptr_to_array = str;
printf("%s",ptr_to_array);
}
(a) Compilation will only give a warning but will proceed to execute & will display "fast"
(b) display "fast" on screen (c) will give a compilation error (d) none of the above
11.What would be the output of the following program.
main()
{
int num,*p;
num=5;
p=#
printf("%d",*p);
}
(a) 6 (b) 5 (c) junk value (d) compilation error
12.What would be the output of the following program.
main()
{
int a[3]={2,3,4};
char *p;
p=a;
p=(char *)((int *)p+1);
printf("%d",p);
}
(a) 2 (b) 0 (c) junk value (d) 3
13.What would be the output of the following program.
main()
{
int i=10;
fn(i);
printf("%d",i);
}
fn(int i)
{
return ++i;
}
(a) 10 (b) 11 (c) 12 (d) Compilation error
14. What will be the value of i & j after the loop isexecuted?
for(i=0,j=0;i<5,j<25;i++,j++)
(a) i=4,j= 24 (b) i=24,j= 24 (c) i=25,j= 25 (d) i=5,j=25
15.What would be the output of the following program.
main()
{
int i,j;
i=10;
j=sizeof(++i);
printf("%d",i);
}
(a) 11 (b) 10 (c) 4 (d) compilation error
16.What would be the output of the following program.
main()
{
int i=7;
printf("%d\n",i++*i++);
}
(a) 49 (b) 56 (c) 72 (d) compilation error
17. What will the printf print?
main()
{
char *p,*f();
p=f();
printf("f() returns:%s\n",p);
}
char *f()
{
char result[80];
strcpy(result,"anything will do");
return (result);
}
(a) f() returns: anything will do (b) f() returns:
(c) compilation error (d) The printf statement is not going to be executed
18.How many times the following program would print 'Jamboree'?
main()
{
printf("\n Jamboree");
main();
}
(a) infinite number of times (b) 32767 times
(c) 65535 times (d) till the stack does not overflow
19.Notice the error in the default statement in the code snippet below.Will it give a compilation error?
main()
{
int a=10,j;
j=fn(a);
switch(j)
{
case 30: printf("the value is 30");
break;
case 50: printf("the value is 50");
break;
default:printf("the value is not 30 or 50");
}
}
fn(int a)
{
return (++a);
}
(a) Will display "the value is 30" (b) Will display "The value is not 30 or 50"
(c) Yes a compilation error would happen
(d) No compilation errors but there will be no output on the screen
20.What would be the output of the following program.
main()
{
struct emp
{
char name[20];
int age;
float sal;
};
struct emp e = {"tiger"};
printf("\n %d %f",e.age,e.sal);
}
(a) 0 0.000000 (b) Garbage values (c) Error (d) none of the above
ABB Placement Paper -2 MAY 2007,VADODRA
TECHNICAL PAPER-40 QUESTION, 45- MINUTES
(1)in a ckt. We r giving voltage of 50 Hz as well as 60. then what will be the resultant frequency.
(a)less than 50 (b)more than 60(c)in between 50 & 60
(d)none……….according to our conclusion answer will be none because if we apply two frequency component resultant frequency we can not say with such an ease.U should confirm the answer
2.In a ckt a single resistor is connected across a d.c. source, what will be the effect on current in first resistor if we connect one more resistance in parallel with earlier one….
Answer.. no change since it is a parallel combination.
3.why we don’t like flashover in transmission line (t-line)-
(a ) it may create earth fault(b )it reduces the life of insulator…..
Read something about flashover & puncture.
4.total no of strands in a arcs conductor is 81, then what is the no. of conductor in its outer layer….(a)36 (b)18 (c)24…….Also read some more on acsr.
5.Two questions based on p.u. calculation like , p.u. calculation is given with respect to some old base and u have to calculate it with reference to new base.
(new resistance/old)=(mva new /mva old)*(old voltage/new voltage)2.
Other question is based upon transfer of p.u calculation in transformer i.e. how base changes when we we move from primary to secondary or like wise.read some more on p.u calculation.
6.which table is referred for sag calculation-
(a)stringing chart……answer
7.in a R-L ckt a ac voltage is applied , such that instantaneous power is negative for 2ms, then what will be the power factor.
(a) 9 deg, (b) 18 deg, (c) 36 Deg………..(I don’t know the correct ans)
8. In an incandescent lamp
(a) luminous intensity is more than non-luminous intensity
(b) ,, ,, ,, less ,, ,, ,,
Ans: Since efficiency is less than 100%, hence ans is (b), u should confirm it further.
9. In which motor no-load to full-load diff. is lowest
(a) series motor, (b) shunt motor, (c) Compound motor
Ans: (b)
10. In a 60Hz induction motor full load speed is 850 rpm then what is the Synchronous speed. (a) 900 rpm, (b) 950 rpm, (c) 1600 rpm………………..Ans: (a)
11. A sync. Motor is running at synch. Speed, if al of sudden D.C. excitation is removed, then
(a) it will rotate at slip speed, (b) it will stop, (c) it will continue to rotate at sync. Speed
Ans: (a), because actually it will acts as Induction motor.
12. A transmission line is designed for 50Hz, 440KV. If we want to transfer power at 60Hz, 440 KV, then the power transfer capability will
(a) decrease, (b) Increase, (c)None
Ans: (a) …as P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque angle.
13. Increased rotor resistance in rotor ckt of induction motor is related with
(a) high starting torque, (b) more speed variation,…………………Ans: (a)
14. In the formulae E = 4.44 f N Ф, Ф is
(a) Avg value, (b) Rms value, (c) Maximum value…………………Ans: (a)…[confirm it]
15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then rms power is
…….(refer book by Edministrator on NETWORK ..)
16. Input impedence of MOSFET is
(a) more than BJT……..(Ans)
17, 18. Remember truth table of AND, NOR, NAND, OR, EX-OR ETC…
19. Conversion of Binary number into Equivalent decimal No.
20. Megger is used for the measurement of (a) Insulation resistance, (b) Conductor resistance………….Ans: (a)
21. Form factor for sinusoidal as well as DC
22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is
(a) short transmission line, (b) long, (c) medium……………….Ans: (a)
23. Improvement in power factor reduces
(a) power consumed by consumer, (b) power generation, (c) both a & b………..Ans: (c)
[Confirm it]
24. Read about field test of Series Motor…
25. No-load test for Synchronous motor, the graph is drawn
(a) stator open ckt emf Vs field current…………………………………(Ans: a)
26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating power has a frequency (a) 50 Hz, (b) 100, (c) no oscillating power is there in resistive ckt……Ans: (a)
27. Insulation used in transformer ___________leakage flux.
(a) increases, (b) decreases…………Ans: (b)
28.After rain what happens to Insulator (a) break-down strength of Insulator decreases, (b)Arch length reduces, ……….Ans: (b)…..[Confirm it]
29.Diversity factor helps to …………(what ?)
[Read diversity factor, load factor, Reserve capacity factor in depth, with calculation]
30. Why capacitance is shown as a Shunt element in analysis of transmission line
(a) it is between Conductor & earth, (b) because Admittance is used for calculation of capacitive reactance……………………Ans: (a)
31. B-R-Y sequence is followed in three phase system, if phase voltage in B-phase is Vm sin 100, then the phase voltage in R-phase would be (a) Vm sin (-20)……Ans:(a)
32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is (a) pure resistive ckt………………..[Ans]
33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is the time constant………..Ans: time constant = L/R = 0.5
34. In electro-dynamometer A’meter & wattmeter the type of scale is …Ans:Non-uniform
35. For the same current carrying capacity corona loss of ACSR will be ________than copper conductor. (a) more, (b) less, (c) equal…Ans:(b)
36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor, then what happens to the illumination, if we change the capacitance.
Ans: No change at all
37. Read about surge impendence of over-head and under-ground cable, Surge impedence formula = sqrt(L/C)
*****[N.B] We are not mentioning the options in sequence, and do not think that ans for the most questions is option (a). Read all options very carefully as all are very close to each other.
QUANTITATIVE PAPER + PCM paper
45 Questions ---------45 minutes
1. About 10 quanti questions ( based on Mixture, Work etc. of very easy type)
2. What is GDP ?
3. Vector algebra, codition for Co-planer vector etc.
4. Gravitation, geo-synchronous satellite( it’s hight, orbit , radius etc.), escape velocity, how g (gravitational accln) varies, about gravitational potential.
5. Basic electricity and Magnetism----Biot-savart law, current carrying conductor properties.
6. Nuclear physics, Bohr’s constant, and Other theories related .
7. Problem based on VIBGYOR , how wave length and frequency is varying.
8. Questions based on Plank’s Theory, E =hv
9. V=u + at , V2=u2 + 2as and W = mgh
questions based on above theory
10. Faraday’s laws of electrolysis, m = Zit
11. Heat conduction problem.
12. Co lour-coding of resistor (BBROYGBVGW)
13. How velocity of light changes in different medium while frequency remain unchanged.
14. statistics , calculation of mode, co-efficient regression (3-4 Questions)
15. f(x) = Sin x + Cos x, find the maximum value of the function…….Ans: sqrt (2)
16. Formulae for parallel plate capacitor and force between plates.
(1)in a ckt. We r giving voltage of 50 Hz as well as 60. then what will be the resultant frequency.
(a)less than 50 (b)more than 60(c)in between 50 & 60
(d)none……….according to our conclusion answer will be none because if we apply two frequency component resultant frequency we can not say with such an ease.U should confirm the answer
2.In a ckt a single resistor is connected across a d.c. source, what will be the effect on current in first resistor if we connect one more resistance in parallel with earlier one….
Answer.. no change since it is a parallel combination.
3.why we don’t like flashover in transmission line (t-line)-
(a ) it may create earth fault(b )it reduces the life of insulator…..
Read something about flashover & puncture.
4.total no of strands in a arcs conductor is 81, then what is the no. of conductor in its outer layer….(a)36 (b)18 (c)24…….Also read some more on acsr.
5.Two questions based on p.u. calculation like , p.u. calculation is given with respect to some old base and u have to calculate it with reference to new base.
(new resistance/old)=(mva new /mva old)*(old voltage/new voltage)2.
Other question is based upon transfer of p.u calculation in transformer i.e. how base changes when we we move from primary to secondary or like wise.read some more on p.u calculation.
6.which table is referred for sag calculation-
(a)stringing chart……answer
7.in a R-L ckt a ac voltage is applied , such that instantaneous power is negative for 2ms, then what will be the power factor.
(a) 9 deg, (b) 18 deg, (c) 36 Deg………..(I don’t know the correct ans)
8. In an incandescent lamp
(a) luminous intensity is more than non-luminous intensity
(b) ,, ,, ,, less ,, ,, ,,
Ans: Since efficiency is less than 100%, hence ans is (b), u should confirm it further.
9. In which motor no-load to full-load diff. is lowest
(a) series motor, (b) shunt motor, (c) Compound motor
Ans: (b)
10. In a 60Hz induction motor full load speed is 850 rpm then what is the Synchronous speed. (a) 900 rpm, (b) 950 rpm, (c) 1600 rpm………………..Ans: (a)
11. A sync. Motor is running at synch. Speed, if al of sudden D.C. excitation is removed, then
(a) it will rotate at slip speed, (b) it will stop, (c) it will continue to rotate at sync. Speed
Ans: (a), because actually it will acts as Induction motor.
12. A transmission line is designed for 50Hz, 440KV. If we want to transfer power at 60Hz, 440 KV, then the power transfer capability will
(a) decrease, (b) Increase, (c)None
Ans: (a) …as P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque angle.
13. Increased rotor resistance in rotor ckt of induction motor is related with
(a) high starting torque, (b) more speed variation,…………………Ans: (a)
14. In the formulae E = 4.44 f N Ф, Ф is
(a) Avg value, (b) Rms value, (c) Maximum value…………………Ans: (a)…[confirm it]
15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then rms power is
…….(refer book by Edministrator on NETWORK ..)
16. Input impedence of MOSFET is
(a) more than BJT……..(Ans)
17, 18. Remember truth table of AND, NOR, NAND, OR, EX-OR ETC…
19. Conversion of Binary number into Equivalent decimal No.
20. Megger is used for the measurement of (a) Insulation resistance, (b) Conductor resistance………….Ans: (a)
21. Form factor for sinusoidal as well as DC
22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is
(a) short transmission line, (b) long, (c) medium……………….Ans: (a)
23. Improvement in power factor reduces
(a) power consumed by consumer, (b) power generation, (c) both a & b………..Ans: (c)
[Confirm it]
24. Read about field test of Series Motor…
25. No-load test for Synchronous motor, the graph is drawn
(a) stator open ckt emf Vs field current…………………………………(Ans: a)
26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating power has a frequency (a) 50 Hz, (b) 100, (c) no oscillating power is there in resistive ckt……Ans: (a)
27. Insulation used in transformer ___________leakage flux.
(a) increases, (b) decreases…………Ans: (b)
28.After rain what happens to Insulator (a) break-down strength of Insulator decreases, (b)Arch length reduces, ……….Ans: (b)…..[Confirm it]
29.Diversity factor helps to …………(what ?)
[Read diversity factor, load factor, Reserve capacity factor in depth, with calculation]
30. Why capacitance is shown as a Shunt element in analysis of transmission line
(a) it is between Conductor & earth, (b) because Admittance is used for calculation of capacitive reactance……………………Ans: (a)
31. B-R-Y sequence is followed in three phase system, if phase voltage in B-phase is Vm sin 100, then the phase voltage in R-phase would be (a) Vm sin (-20)……Ans:(a)
32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is (a) pure resistive ckt………………..[Ans]
33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is the time constant………..Ans: time constant = L/R = 0.5
34. In electro-dynamometer A’meter & wattmeter the type of scale is …Ans:Non-uniform
35. For the same current carrying capacity corona loss of ACSR will be ________than copper conductor. (a) more, (b) less, (c) equal…Ans:(b)
36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor, then what happens to the illumination, if we change the capacitance.
Ans: No change at all
37. Read about surge impendence of over-head and under-ground cable, Surge impedence formula = sqrt(L/C)
*****[N.B] We are not mentioning the options in sequence, and do not think that ans for the most questions is option (a). Read all options very carefully as all are very close to each other.
QUANTITATIVE PAPER + PCM paper
45 Questions ---------45 minutes
1. About 10 quanti questions ( based on Mixture, Work etc. of very easy type)
2. What is GDP ?
3. Vector algebra, codition for Co-planer vector etc.
4. Gravitation, geo-synchronous satellite( it’s hight, orbit , radius etc.), escape velocity, how g (gravitational accln) varies, about gravitational potential.
5. Basic electricity and Magnetism----Biot-savart law, current carrying conductor properties.
6. Nuclear physics, Bohr’s constant, and Other theories related .
7. Problem based on VIBGYOR , how wave length and frequency is varying.
8. Questions based on Plank’s Theory, E =hv
9. V=u + at , V2=u2 + 2as and W = mgh
questions based on above theory
10. Faraday’s laws of electrolysis, m = Zit
11. Heat conduction problem.
12. Co lour-coding of resistor (BBROYGBVGW)
13. How velocity of light changes in different medium while frequency remain unchanged.
14. statistics , calculation of mode, co-efficient regression (3-4 Questions)
15. f(x) = Sin x + Cos x, find the maximum value of the function…….Ans: sqrt (2)
16. Formulae for parallel plate capacitor and force between plates.
ABB Placement Paper -8th JULY AT COIMBATORE
ABB PAPER ON 8th JULY AT COIMBATORE
Hi friends,
I attended ABB last week and the test pattern is as follows:
1) Verbal section - 20 (20 mins): Very easy. No need special preps
2) Analytical - 20(25 mins): Somewhat tough. Time matters
3) Attention to detail - 15(15 mins): Easy. Questions like which two are alike
4) Technical - 60(60 mins): Very tough. Questions from almost every nook and corner of EEE. More questions from switchgears, circuit breakers. etc
The test will be online and there is sectional cut-off. The shortlisted will be called to Bangalore.
Interview:
More of technical. Be thorough with ur basics like the current eqn in series RLC circuit. Questions may be from anywhere. Prepare ur project and paper well. They asked
abt the paper for one hr. Very tricky hr questions will be asked. If u clear this round there will be a psychometric test and hr round again. Not like all other companis.
U should be very formal and prepare well
Hi friends,
I attended ABB last week and the test pattern is as follows:
1) Verbal section - 20 (20 mins): Very easy. No need special preps
2) Analytical - 20(25 mins): Somewhat tough. Time matters
3) Attention to detail - 15(15 mins): Easy. Questions like which two are alike
4) Technical - 60(60 mins): Very tough. Questions from almost every nook and corner of EEE. More questions from switchgears, circuit breakers. etc
The test will be online and there is sectional cut-off. The shortlisted will be called to Bangalore.
Interview:
More of technical. Be thorough with ur basics like the current eqn in series RLC circuit. Questions may be from anywhere. Prepare ur project and paper well. They asked
abt the paper for one hr. Very tricky hr questions will be asked. If u clear this round there will be a psychometric test and hr round again. Not like all other companis.
U should be very formal and prepare well
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