Question 1 of 18

1. Which application requires only DC?

Electroplating

Operating induction motor

Stepping up of voltage

Operating repulsion motor

Question 1 of 18

Question 2 of 18

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

Run the motor at synchronous speed

Carry more load in motor

Improve the power factor

Reduce the losses in motor

Question 2 of 18

Question 3 of 18

3. Which converter is having high efficiency?

Mercury arc rectifier

SCR converter

Motor generator set

Rotary converter

Question 3 of 18

Question 4 of 18

4. What is the name of the converter?

Mercury arc rectifier

Metal rectifier

Rotary converter

Motor-Generator set

Question 4 of 18

Question 5 of 18

5. 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 5 of 18

Question 6 of 18

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

Excite the field winding

Maintain constant speed

Maintain power factor

Start the synchronous motor

Question 6 of 18

Question 7 of 18

7. What is the function of inverter?

Smoothening A.C sine wave

Convert D.C to A.C

Convert A.C to D.C

Convert pulsating DC into pure D.C

Question 7 of 18

Question 8 of 18

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

Produce high current to start rotate the motor

Produces torque and runs near in synchronous speed

Produce high voltage to initiate the rotation

Produce a high magnetic-field to maintain a constant speed

Question 8 of 18

Question 9 of 18

9. What is the name of the converter?

Silicon controlled rectifier

Rotary converter

Metal rectifier

Mercury arc rectifier

Question 9 of 18

Question 10 of 18

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

Run the motor with over load

Reduce the losses

Start the motor initially

Run the motor at synchronous speed

Question 10 of 18

Question 11 of 18

11. Which is the main application of synchronous motor?

Paper rolling mills

AC to DC converter

Power factor correction device

Elevators

Question 11 of 18

Question 12 of 18

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

Varying the line voltage

Increasing the speed of motor

Decreasing the speed of motor

Varying the field excitation

Question 12 of 18

Question 13 of 18

13. What is the advantage of motor generator set?

Low maintenance required

Noiseless

High efficiency

DC output voltage can be easily controlled

Question 13 of 18

Question 14 of 18

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

Reduces voltage drop

Collects the delivered direct current

Helps to deliver without noise

Converts AC to DC

Question 14 of 18

Question 15 of 18

15. Which converting device can be over loaded?

Rotary converter

Mercury arc rectifier

Rectifier unit

Motor generator set

Question 15 of 18

Question 16 of 18

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

Defective pony motor

Short in damper winding

Open in damper winding

Insufficient excitation

Question 16 of 18

Question 17 of 18

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

Very sensitive to temperature

Heavily doped device

Very low power device

Designed for light emitting

Question 17 of 18

Question 18 of 18

18. Which acts as both inverter and converter?

Metal rectifier

Mercury arc rectifier

Synchronous converter

Semi conductor diode

Question 18 of 18