Question 1 of 18

1. What is the name of the converter?

Silicon controlled rectifier

Mercury arc rectifier

Metal rectifier

Rotary converter

Question 1 of 18

Question 2 of 18

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

Varying stator voltage in motor

Varying the rotor excitation

Varying the motor load

Varying stator current in motor

Question 2 of 18

Question 3 of 18

3. Which acts as both inverter and converter?

Synchronous converter

Semi conductor diode

Mercury arc rectifier

Metal rectifier

Question 3 of 18

Question 4 of 18

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

Varying the field excitation

Increasing the speed of motor

Varying the line voltage

Decreasing the speed of motor

Question 4 of 18

Question 5 of 18

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

Insufficient excitation

Defective pony motor

Short in damper winding

Open in damper winding

Question 5 of 18

Question 6 of 18

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

Designed for light emitting

Very low power device

Very sensitive to temperature

Heavily doped device

Question 6 of 18

Question 7 of 18

7. 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 7 of 18

Question 8 of 18

8. Which converting device can be over loaded?

Mercury arc rectifier

Rectifier unit

Rotary converter

Motor generator set

Question 8 of 18

Question 9 of 18

9. Which converter is having high efficiency?

Motor generator set

Rotary converter

Mercury arc rectifier

SCR converter

Question 9 of 18

Question 10 of 18

10. Which is the main application of synchronous motor?

Paper rolling mills

Elevators

AC to DC converter

Power factor correction device

Question 10 of 18

Question 11 of 18

11. Which application requires only DC?

Operating repulsion motor

Electroplating

Operating induction motor

Stepping up of voltage

Question 11 of 18

Question 12 of 18

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

Start the synchronous motor

Maintain power factor

Excite the field winding

Maintain constant speed

Question 12 of 18

Question 13 of 18

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

Converts AC to DC

Helps to deliver without noise

Reduces voltage drop

Collects the delivered direct current

Question 13 of 18

Question 14 of 18

14. What is the function of inverter?

Convert pulsating DC into pure D.C

Smoothening A.C sine wave

Convert D.C to A.C

Convert A.C to D.C

Question 14 of 18

Question 15 of 18

15. What is the name of the converter?

Mercury arc rectifier

Motor-Generator set

Metal rectifier

Rotary converter

Question 15 of 18

Question 16 of 18

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

Produces torque and runs near in synchronous speed

Produce a high magnetic-field to maintain a constant speed

Produce high voltage to initiate the rotation

Produce high current to start rotate the motor

Question 16 of 18

Question 17 of 18

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

Run the motor with over load

Run the motor at synchronous speed

Reduce the losses

Start the motor initially

Question 17 of 18

Question 18 of 18

18. What is the advantage of motor generator set?

DC output voltage can be easily controlled

High efficiency

Noiseless

Low maintenance required

Question 18 of 18