Question 1 of 18

1. Which application requires only DC?

Operating repulsion motor

Stepping up of voltage

Electroplating

Operating induction motor

Question 1 of 18

Question 2 of 18

2. Which converter is having high efficiency?

Motor generator set

SCR converter

Mercury arc rectifier

Rotary converter

Question 2 of 18

Question 3 of 18

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

Produce high current to start rotate the motor

Produce a high magnetic-field to maintain a constant speed

Produces torque and runs near in synchronous speed

Produce high voltage to initiate the rotation

Question 3 of 18

Question 4 of 18

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

Very low power device

Designed for light emitting

Heavily doped device

Very sensitive to temperature

Question 4 of 18

Question 5 of 18

5. What is the name of the converter?

Mercury arc rectifier

Metal rectifier

Rotary converter

Silicon controlled rectifier

Question 5 of 18

Question 6 of 18

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

Open in damper winding

Defective pony motor

Insufficient excitation

Short in damper winding

Question 6 of 18

Question 7 of 18

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

Reduces voltage drop

Converts AC to DC

Helps to deliver without noise

Collects the delivered direct current

Question 7 of 18

Question 8 of 18

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

Start the motor initially

Run the motor at synchronous speed

Run the motor with over load

Reduce the losses

Question 8 of 18

Question 9 of 18

9. What is the advantage of motor generator set?

Noiseless

High efficiency

DC output voltage can be easily controlled

Low maintenance required

Question 9 of 18

Question 10 of 18

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

Increasing the speed of motor

Varying the line voltage

Varying the field excitation

Decreasing the speed of motor

Question 10 of 18

Question 11 of 18

11. Which converting device can be over loaded?

Rotary converter

Rectifier unit

Motor generator set

Mercury arc rectifier

Question 11 of 18

Question 12 of 18

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

Varying stator current in motor

Varying the motor load

Varying stator voltage in motor

Varying the rotor excitation

Question 12 of 18

Question 13 of 18

13. What is the function of inverter?

Convert A.C to D.C

Convert pulsating DC into pure D.C

Convert D.C to A.C

Smoothening A.C sine wave

Question 13 of 18

Question 14 of 18

14. What is the name of the converter?

Rotary converter

Metal rectifier

Motor-Generator set

Mercury arc rectifier

Question 14 of 18

Question 15 of 18

15. Which acts as both inverter and converter?

Mercury arc rectifier

Synchronous converter

Semi conductor diode

Metal rectifier

Question 15 of 18

Question 16 of 18

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

Improve the power factor

Run the motor at synchronous speed

Carry more load in motor

Reduce the losses in motor

Question 16 of 18

Question 17 of 18

17. 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 17 of 18

Question 18 of 18

18. Which is the main application of synchronous motor?

AC to DC converter

Elevators

Paper rolling mills

Power factor correction device

Question 18 of 18