ABB Placement Interview questions with answers and careers

ABB Placement Interview questions with answers and careers:

1.For the same current carrying capacity corona loss of ACSR will be  ________than the copper conductor.

(a) more 

(b) less 

(c) equal. 

Ans: (b)

2. Improvement in power factor reduces

(a) power consumed by consumer

(b) power generation 

(c) both a & b

3.Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is

(a) short transmission line

(b) long

(c) medium

4.In the formulae E = 4.44 f N ?, ? is

(a) Avg value 

(b) Rms value 

(c) Maximum value

5.In which motor no-load to full-load diff. is lowest

(a) series motor 

(b) shunt motor 

(c) Compound motor

Ans: (b)

6.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

7.Increased rotor resistance in rotor ckt of induction motor is related with

(a) high starting torque

(b) more speed variation

Ans: (a)

8.In the formulae E = 4.44 f N ?, ? is

(a) Avg value 

(b) Rms value

(c) Maximum value

Ans: (a)

9.f(x) = Sin x + Cos x, find the maximum value of the function

10.What is GDP ?

11. 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)

12.Insulation used in transformer ___________leakage flux.

(a) increases

(b) decreases 

Ans: (b)

13.Megger is used for the measurement of (a) Insulation resistance, (b)  Conductor resistance

Ans: (a)

14.In the formulae E = 4.44 f N ?, ? is

(a) Avg value, (b) Rms value, (c) Maximum value

Ans: (a)

15.In which motor no-load to full-load diff. is lowest

(a) series motor, (b) shunt motor, (c) Compound motor

Ans: (b)

16.why we don,t like flashover in transmission line (t-line)-

(a ) it may create earth fault(b )it reduces the life of insulator

17..After rain what happens to Insulator (a) break-down strength of Insulator  decreases, (b)Arch length reduces,

Ans: (b)

18.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)

19. 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

20.What would be the output of the following program.

main()
{
int i=7;
printf(“%d
“,i++*i++);
}

(a) 49 

(b) 56 

(c) 72 

(d) compilation error

21.What would be the output of the following program.

main()
{
struct emp
{
char name[20];
int age;
float sal;
};
struct emp e = {“tiger”};
printf(”
%d %f”,e.age,e.sal);
}

(a) 0 0.000000 

(b) Garbage values 

(c) Error 

(d) none of the above

22.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

23.What would be the output of the following program.

#define CUBE(x) (x*x*x)
main()
{
int a,b=3;
a=CUBE(b++);
printf(”
%d %d”,a,b);
}

(a) 64 4 

(b) 27 4 

(c) 27 6 

(d) 64 6

24.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!!

25.What would be the output of the following program.

main()
{
int a[5]={2,3};
printf(”
%d %d %d”,a[2],a[3],a[4]);
}

(a) garbage value 

(b) 2 3 3 

(c) 3 2 2 

(d) 0 0 0

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