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1. A series RLC circuit R=2?, L=1mH, C=0.1?F. Value of quality factor?

A

25

B

30

C

40

D

50

2. Kirchhoff?s laws: 1. Junction law (sum of currents). 2. Loop law (sum of potential). Choose correct.

A

1 correct, 2 incorrect

B

2 correct, 1 incorrect

C

Both correct

D

Both incorrect

3. Magnetic field produced in stator of 3-phase induction motor travels at

A

Rotating speed

B

Synchronous speed

C

Asynchronous speed

D

Slip speed

4. Why AC cannot be measured by DC ammeter?

A

AC cannot pass

B

Average value zero

C

Direction changes

D

None

5. Wiring insulation resistance for 240V system, 2.4 kW load?

A

0.08 M?

B

0.05 M?

C

0.02 M?

D

0.12 M?

6. 3-phase 440V 50Hz motor with 5% slip. Rotor frequency?

A

50 Hz

B

2.5 Hz

C

5 Hz

D

2 Hz

7. Permanent wiring systems used in residential?

A

I,III

B

II,III

C

III,IV

D

I,II,III,IV

8. Min clearance of HV line across road?

A

6.1 m

B

5.2 m

C

5.8 m

D

8.1 m

9. If supply voltage of 3-phase induction motor ? 2 times, torque?

A

Twice

B

Four times

C

1/2

D

Same

10. Which is correct for induction motor?

A

Speed=0

B

Slip=0

C

Speed=synchronous

D

Slip<0

11. Correct about induction motor?

A

Single-phase induction high starting torque

B

Single-phase low starting torque

C

Power factor of single-phase more than 3-phase

D

All

12. Ward - Leonard controlled DC drives are generally used for:

A

Light duty excavators

B

Medium duty excavators

C

Heavy duty excavators

D

Low duty excavators

13. Bohr Magneton is unit of:

A

Magnetic energy

B

Permanent dipole moment due to spin

C

Polarisability

D

Hysteresis

14. What is the required connection for an enhancement type N-MOSFET to function as a resistor?

A

Gate connected to sources

B

Gate connected to drain

C

Drain connected to sources

D

Source open-circuited

15. What is the Output voltage of Op-amp for input voltage of Vi1=150 ?V,Vi2=140 ?V if the amplifier has differential gain of Ad=4000 and value of CMRR is 100.

A

45.8 mV

B

40.006 mV

C

10 ?V

D

145 ?V

16. What happens when the shunt resistance of a galvanometer circuit is increased?

A

Its current sensitivity increases.

B

Its current sensitivity decreases.

C

It?s damping increases.

D

It?s controlling torque increases.

17. A DC shunt generator supplies 450 A at 230 V. The resistances of shunt field and armature are 50 ? and 0.025 ? respectively. What will be the armature voltage drop?

A

11.24 V

B

22.7 V

C

31.6 V

D

38.4 V

18. A single phase 60 Hz generator supplies an inductive load of 4500kW at a power factor of 0.80 lagging by means of a 20 km long overhead transmission line. The line resistance and inductance are 0.0195 ohm and 0.60 mH per km. The voltage at the receiving end is required to be kept constant at 10.2 kV. Find the voltage regulation of the line.

A

12.59%

B

16.34%

C

32.68%

D

41.15%

19. What is the energy stored in the magnetic field at a solenoid of 40 cm long and 4 cm diameter wound with 100 turns of wire carrying a current at 20A?

A

0.705 Joule

B

0.789 Joule

C

0.587 Joule

D

0.658 Joule

20. What does the maximum Surge current rating of an SCR specify?

A

Repetitive current with sine wave.

B

Non-repetitive current with rectangular wave.

C

Non-repetitive current with sine wave.

D

Repetitive current with rectangular wave.