HAL Technical - Other

 I am from Electrical and Electronics department, attended for

Hai I am from Electrical and Electronics department, attended for HAL-Management Trainee On-Line written test on 14^th-Nov-2008

Time:      12:30-15:00

Venue:      Narayanamma Institute of Technology,      Hyderabad

 

Some of the questions from my paper are given below:

  

1. When length of a wire increases  its resistance

a. doubles            b. half               c. remains same

Ans:            ( a )

2.   When a 50 Hz ,6-pole Induction Motor runs at 975rpm,the rotor emf frequency is 

      a. 12.5Hz      b. 1.25Hz      c. 4Hz

      Ans:      ( b )

3.   When a 6 pole 50Hz Induction Motor runs at 1450 rpm , it’s working mode is

      a. motoring       b. braking       c. generating

      Ans:      ( a )

4.   Slips for Different modes of operation of Induction Motor  are

      answer:      motoring -0<S<1,generating-      S<0,braking -      S>1

5. Damping ratio ( ξ ) is 0.75, natural frequency is 12 rad/s are given & asked to find peak time
6. In electrodynamo-meter type wattmeter

a.      pressure coil is made fixed

b.      current coil is made fixed

c.      both the coils are made fixed

Ans:            ( a )

7. In flux meter control torque is produced by

a.      weights attached to it.

b.      Springs

c.      No control torque is there

Ans:            ( c )

8. One question regarding hot wire instrument
9. In MI meters deflecting torque is proportional to

a.      square of the current

b.      square of the voltage

Ans:            ( a )

10. In 3-Φ system total power is given by

a.      √3V­_LI_Lcos Φ

b.      3V­_LI_Lcos Φ

c.      V­_LI_Lcos Φ 

Ans:            ( a )

11. From supply one 3-Φ step-down transformer is drawing 10 A, the secondary current will be minimum when the transformer is

a.      star-delta

b.      delta-star

c.      delta-delta

d.      star-star

Ans:            ( b )

12. Transformer rating is expressed in

a.      KVA

b.      KVAR

c.      KW

Ans:            ( a )

 

           

13. Manganin is a

a.      Insulator

b.      Semi-conductor

c.      Alloy

Ans:            ( I think it is alloy )

14. Dual scope oscilloscope has

a.      two separate horizontal and two separate vertical plates

b.      one horizontal and two separate vertical plates

c.      two separate horizontal and one vertical plates

d.      one horizontal and one vertical plates

15. Standard Cell voltage is measured by

a.      MI meter     

b.      MC meter

c.      Potentiometer

16. The input resistance of the CRO is of the order of

a.      tens of ohm

b.      mega ohm

c.      kilo ohm

d.      fraction of an ohm

Ans:            ( b )

17. Errors are introduced in Wheatstone bridge due to

a.      lead resistance

b.      contact resistance

c.      some thing is given

d.      all of the above

Ans:            ( I think d )

18. HRC fuse and circuit-breaker combination is used CB operates for

a.      low over-load currents

b.      high over-load currents

c.      combination is never used

Ans:            ( I think a )

19. G(s) = K / s(s+5)(s+1)  is given to find the value of K for stable operation
20. By increasing gain of the system root locus will

a.      moves away from poles

b.      moves away from zeros

c.      crosses imaginary axis

Ans:            ( a )

21. When the load current is high while measuring power using wattmeter

a.      current coil is connected near load

b.      pressure coil is connected near load

22. C = 0.01µF and L = 1 mH and current is 10 A and asked to find the voltage drop
23. Transmission line is terminated by R and no reflection is there , then the value of  R is _________

Ans:            400 ohm

24. One question regarding shunt ohm-meter and seriea ohm-meter
25. Inverted V curves are drawn between ________

Ans:            field current             Vs            power factor

26. Copper loss and Iron loss are given and asked to find at what fraction of full load max.efficiency occurs              ( easy to solve )
27. Aroud 3-4 questions from errors by giving resistance values with their standard deviation like 15 ± 5 % asked to find out the series combination error and parallel combination error likewise
28. Odd man out in aptitude about two questions
29. In reasoning finding the next diagram in series
30. One Antonym
31. Mainly you should perfect in tenses for solving English questions

 

 

These are the questions I have remembered from my paper, I think major share in my question paper is from measurements and next  AC machines

 

ALL THE VERY BEST

 

Raj psn

Time:      12:30-15:00

Venue:      Narayanamma Institute of Technology,      Hyderabad

 Some of the questions from my paper are given below:

1. When length of a wire increases  its resistance

a. doubles            b. half               c. remains same

Ans:            ( a )

2.   When a 50 Hz ,6-pole Induction Motor runs at 975rpm,the rotor emf frequency is 

      a. 12.5Hz      b. 1.25Hz      c. 4Hz

      Ans:      ( b )

3.   When a 6 pole 50Hz Induction Motor runs at 1450 rpm , it’s working mode is

      a. motoring       b. braking       c. generating

      Ans:      ( a )

4.   Slips for Different modes of operation of Induction Motor  are

      answer:      motoring -0<S<1,generating-      S<0,braking -      S>1

5. Damping ratio ( ξ ) is 0.75, natural frequency is 12 rad/s are given & asked to find peak time
6. In electrodynamo-meter type wattmeter

a.      pressure coil is made fixed

b.      current coil is made fixed

c.      both the coils are made fixed

Ans:            ( a )

7. In flux meter control torque is produced by

a.      weights attached to it.

b.      Springs

c.      No control torque is there

Ans:            ( c )

8. One question regarding hot wire instrument
9. In MI meters deflecting torque is proportional to

a.      square of the current

b.      square of the voltage

Ans:            ( a )

10. In 3-Φ system total power is given by

a.      √3V­_LI_Lcos Φ

b.      3V­_LI_Lcos Φ

c.      V­_LI_Lcos Φ 

Ans:            ( a )

11. From supply one 3-Φ step-down transformer is drawing 10 A, the secondary current will be minimum when the transformer is

a.      star-delta

b.      delta-star

c.      delta-delta

d.      star-star

Ans:            ( b )

12. Transformer rating is expressed in

a.      KVA

b.      KVAR

c.      KW

Ans:            ( a )

       

13. Manganin is a

a.      Insulator

b.      Semi-conductor

c.      Alloy

Ans:            ( I think it is alloy )

14. Dual scope oscilloscope has

a.      two separate horizontal and two separate vertical plates

b.      one horizontal and two separate vertical plates

c.      two separate horizontal and one vertical plates

d.      one horizontal and one vertical plates

15. Standard Cell voltage is measured by

a.      MI meter     

b.      MC meter

c.      Potentiometer

16. The input resistance of the CRO is of the order of

a.      tens of ohm

b.      mega ohm

c.      kilo ohm

d.      fraction of an ohm

Ans:            ( b )

17. Errors are introduced in Wheatstone bridge due to

a.      lead resistance

b.      contact resistance

c.      some thing is given

d.      all of the above

Ans:            ( I think d )

18. HRC fuse and circuit-breaker combination is used CB operates for

a.      low over-load currents

b.      high over-load currents

c.      combination is never used

Ans:            ( I think a )

19. G(s) = K / s(s+5)(s+1)  is given to find the value of K for stable operation
20. By increasing gain of the system root locus will

a.      moves away from poles

b.      moves away from zeros

c.      crosses imaginary axis

Ans:            ( a )

21. When the load current is high while measuring power using wattmeter

a.      current coil is connected near load

b.      pressure coil is connected near load

22. C = 0.01µF and L = 1 mH and current is 10 A and asked to find the voltage drop
23. Transmission line is terminated by R and no reflection is there , then the value of  R is _________

Ans:            400 ohm

24. One question regarding shunt ohm-meter and seriea ohm-meter
25. Inverted V curves are drawn between ________

Ans:            field current             Vs            power factor

26. Copper loss and Iron loss are given and asked to find at what fraction of full load max.efficiency occurs              ( easy to solve )
27. Aroud 3-4 questions from errors by giving resistance values with their standard deviation like 15 ± 5 % asked to find out the series combination error and parallel combination error likewise
28. Odd man out in aptitude about two questions
29. In reasoning finding the next diagram in series
30. One Antonym
31. Mainly you should perfect in tenses for solving English questions

 

These are the questions I have remembered from my paper, I think major share in my question paper is from measurements and next  AC machines

 ALL THE VERY BEST

 Raj psn