Question 1 of 18

1. 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 1 of 18

Question 2 of 18

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

Varying the field excitation

Varying the line voltage

Increasing the speed of motor

Decreasing the speed of motor

Question 2 of 18

Question 3 of 18

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

Very sensitive to temperature

Designed for light emitting

Very low power device

Heavily doped device

Question 3 of 18

Question 4 of 18

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

Run the motor with over load

Start the motor initially

Run the motor at synchronous speed

Reduce the losses

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. What is the function of inverter?

Convert D.C to A.C

Smoothening A.C sine wave

Convert pulsating DC into pure D.C

Convert A.C to D.C

Question 6 of 18

Question 7 of 18

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

Produce high current to start rotate the motor

Produce high voltage to initiate the rotation

Produces torque and runs near in synchronous speed

Produce a high magnetic-field to maintain a constant speed

Question 7 of 18

Question 8 of 18

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

Insufficient excitation

Short in damper winding

Open in damper winding

Defective pony motor

Question 8 of 18

Question 9 of 18

9. Which converting device can be over loaded?

Motor generator set

Rotary converter

Mercury arc rectifier

Rectifier unit

Question 9 of 18

Question 10 of 18

10. What is the advantage of motor generator set?

Low maintenance required

High efficiency

DC output voltage can be easily controlled

Noiseless

Question 10 of 18

Question 11 of 18

11. Which application requires only DC?

Electroplating

Stepping up of voltage

Operating repulsion motor

Operating induction motor

Question 11 of 18

Question 12 of 18

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

Maintain power factor

Start the synchronous motor

Maintain constant speed

Excite the field winding

Question 12 of 18

Question 13 of 18

13. What is the name of the converter?

Mercury arc rectifier

Rotary converter

Metal rectifier

Motor-Generator set

Question 13 of 18

Question 14 of 18

14. Which is the main application of synchronous motor?

Elevators

Power factor correction device

AC to DC converter

Paper rolling mills

Question 14 of 18

Question 15 of 18

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

Varying stator current in motor

Varying the rotor excitation

Varying stator voltage in motor

Varying the motor load

Question 15 of 18

Question 16 of 18

16. Which converter is having high efficiency?

Mercury arc rectifier

SCR converter

Rotary converter

Motor generator set

Question 16 of 18

Question 17 of 18

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

Improve the power factor

Carry more load in motor

Run the motor at synchronous speed

Reduce the losses in motor

Question 17 of 18

Question 18 of 18

18. Which acts as both inverter and converter?

Semi conductor diode

Metal rectifier

Synchronous converter

Mercury arc rectifier

Question 18 of 18