Question 1 of 18

1. What is the advantage of motor generator set?

DC output voltage can be easily controlled

Low maintenance required

High efficiency

Noiseless

Question 1 of 18

Question 2 of 18

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

Improve the power factor

Run the motor at synchronous speed

Reduce the losses in motor

Carry more load in motor

Question 2 of 18

Question 3 of 18

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

Heavily doped device

Very sensitive to temperature

Designed for light emitting

Very low power device

Question 3 of 18

Question 4 of 18

4. Which application requires only DC?

Electroplating

Stepping up of voltage

Operating induction motor

Operating repulsion motor

Question 4 of 18

Question 5 of 18

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

Produce high voltage to initiate the rotation

Produce a high magnetic-field to maintain a constant speed

Produce high current to start rotate the motor

Produces torque and runs near in synchronous speed

Question 5 of 18

Question 6 of 18

6. 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 6 of 18

Question 7 of 18

7. Which converting device can be over loaded?

Rotary converter

Rectifier unit

Mercury arc rectifier

Motor generator set

Question 7 of 18

Question 8 of 18

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

Maintain power factor

Excite the field winding

Start the synchronous motor

Maintain constant speed

Question 8 of 18

Question 9 of 18

9. Which is the main application of synchronous motor?

Power factor correction device

Elevators

AC to DC converter

Paper rolling mills

Question 9 of 18

Question 10 of 18

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

Decreasing the speed of motor

Increasing the speed of motor

Varying the line voltage

Varying the field excitation

Question 10 of 18

Question 11 of 18

11. Which converter is having high efficiency?

Mercury arc rectifier

Motor generator set

Rotary converter

SCR converter

Question 11 of 18

Question 12 of 18

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

Collects the delivered direct current

Reduces voltage drop

Helps to deliver without noise

Converts AC to DC

Question 12 of 18

Question 13 of 18

13. What is the function of inverter?

Smoothening A.C sine wave

Convert D.C to A.C

Convert pulsating DC into pure D.C

Convert A.C to D.C

Question 13 of 18

Question 14 of 18

14. 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 14 of 18

Question 15 of 18

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

Defective pony motor

Insufficient excitation

Short in damper winding

Open in damper winding

Question 15 of 18

Question 16 of 18

16. What is the name of the converter?

Metal rectifier

Rotary converter

Mercury arc rectifier

Motor-Generator set

Question 16 of 18

Question 17 of 18

17. Which acts as both inverter and converter?

Synchronous converter

Mercury arc rectifier

Semi conductor diode

Metal rectifier

Question 17 of 18

Question 18 of 18

18. What is the name of the converter?

Metal rectifier

Silicon controlled rectifier

Mercury arc rectifier

Rotary converter

Question 18 of 18