Question 1 of 18

1. What is the name of the converter?

Motor-Generator set

Mercury arc rectifier

Metal rectifier

Rotary converter

Question 1 of 18

Question 2 of 18

2. What is the purpose of damper winding in a synchronous motor at starting?

Produces torque and runs near in synchronous speed

Produce high voltage to initiate the rotation

Produce high current to start rotate the motor

Produce a high magnetic-field to maintain a constant speed

Question 2 of 18

Question 3 of 18

3. Why the LED's are avoided as converters in rectifier diodes?

Heavily doped device

Very low power device

Very sensitive to temperature

Designed for light emitting

Question 3 of 18

Question 4 of 18

4. What is the function of the part marked as 'X' of the rotary converter?

Helps to deliver without noise

Collects the delivered direct current

Converts AC to DC

Reduces voltage drop

Question 4 of 18

Question 5 of 18

5. Which converting device can be over loaded?

Rectifier unit

Motor generator set

Mercury arc rectifier

Rotary converter

Question 5 of 18

Question 6 of 18

6. Which is the main application of synchronous motor?

Paper rolling mills

Power factor correction device

AC to DC converter

Elevators

Question 6 of 18

Question 7 of 18

7. Which acts as both inverter and converter?

Semi conductor diode

Metal rectifier

Mercury arc rectifier

Synchronous converter

Question 7 of 18

Question 8 of 18

8. How the synchronous motor is used as a synchronous condenser?

Varying the motor load

Varying the rotor excitation

Varying stator voltage in motor

Varying stator current in motor

Question 8 of 18

Question 9 of 18

9. What is the function of damper windings in synchronous motor?

Maintain power factor

Maintain constant speed

Excite the field winding

Start the synchronous motor

Question 9 of 18

Question 10 of 18

10. What is the name of the converter?

Mercury arc rectifier

Rotary converter

Metal rectifier

Silicon controlled rectifier

Question 10 of 18

Question 11 of 18

11. What is the advantage of motor generator set?

High efficiency

Noiseless

DC output voltage can be easily controlled

Low maintenance required

Question 11 of 18

Question 12 of 18

12. Why D.C supply is necessary for synchronous motor operation?

Run the motor at synchronous speed

Start the motor initially

Run the motor with over load

Reduce the losses

Question 12 of 18

Question 13 of 18

13. Which application requires only DC?

Stepping up of voltage

Operating repulsion motor

Electroplating

Operating induction motor

Question 13 of 18

Question 14 of 18

14. Why exciter is essential to run a synchronous motor?

Run the motor at synchronous speed

Reduce the losses in motor

Carry more load in motor

Improve the power factor

Question 14 of 18

Question 15 of 18

15. Why the synchronous motor fails to run at synchronous speed?

Short in damper winding

Defective pony motor

Insufficient excitation

Open in damper winding

Question 15 of 18

Question 16 of 18

16. How synchronous motor works as a power factor corrector?

Varying the line voltage

Varying the field excitation

Decreasing the speed of motor

Increasing the speed of motor

Question 16 of 18

Question 17 of 18

17. What is the function of inverter?

Convert A.C to D.C

Convert D.C to A.C

Smoothening A.C sine wave

Convert pulsating DC into pure D.C

Question 17 of 18

Question 18 of 18

18. Which converter is having high efficiency?

Mercury arc rectifier

Rotary converter

SCR converter

Motor generator set

Question 18 of 18