Question 1 of 18

1. Which converter is having high efficiency?

Mercury arc rectifier

SCR converter

Motor generator set

Rotary converter

Question 1 of 18

Question 2 of 18

2. Which converting device can be over loaded?

Mercury arc rectifier

Rotary converter

Motor generator set

Rectifier unit

Question 2 of 18

Question 3 of 18

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

Excite the field winding

Start the synchronous motor

Maintain power factor

Maintain constant speed

Question 3 of 18

Question 4 of 18

4. Which is the main application of synchronous motor?

Power factor correction device

AC to DC converter

Elevators

Paper rolling mills

Question 4 of 18

Question 5 of 18

5. What is the name of the converter?

Mercury arc rectifier

Silicon controlled rectifier

Rotary converter

Metal rectifier

Question 5 of 18

Question 6 of 18

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

Varying the motor load

Varying stator voltage in motor

Varying stator current in motor

Varying the rotor excitation

Question 6 of 18

Question 7 of 18

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

Open in damper winding

Defective pony motor

Short in damper winding

Insufficient excitation

Question 7 of 18

Question 8 of 18

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

Converts AC to DC

Collects the delivered direct current

Helps to deliver without noise

Reduces voltage drop

Question 8 of 18

Question 9 of 18

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

Run the motor with over load

Start the motor initially

Reduce the losses

Run the motor at synchronous speed

Question 9 of 18

Question 10 of 18

10. What is the advantage of motor generator set?

Noiseless

High efficiency

Low maintenance required

DC output voltage can be easily controlled

Question 10 of 18

Question 11 of 18

11. What is the function of inverter?

Convert D.C to A.C

Convert pulsating DC into pure D.C

Smoothening A.C sine wave

Convert A.C to D.C

Question 11 of 18

Question 12 of 18

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

Carry more load in motor

Reduce the losses in motor

Improve the power factor

Run the motor at synchronous speed

Question 12 of 18

Question 13 of 18

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

Increasing the speed of motor

Varying the field excitation

Varying the line voltage

Decreasing the speed of motor

Question 13 of 18

Question 14 of 18

14. Which application requires only DC?

Operating induction motor

Electroplating

Operating repulsion motor

Stepping up of voltage

Question 14 of 18

Question 15 of 18

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

Very sensitive to temperature

Very low power device

Heavily doped device

Designed for light emitting

Question 15 of 18

Question 16 of 18

16. What is the name of the converter?

Metal rectifier

Mercury arc rectifier

Motor-Generator set

Rotary converter

Question 16 of 18

Question 17 of 18

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

Produce a high magnetic-field to maintain a constant speed

Produce high current to start rotate the motor

Produce high voltage to initiate the rotation

Produces torque and runs near in synchronous speed

Question 17 of 18

Question 18 of 18

18. Which acts as both inverter and converter?

Semi conductor diode

Metal rectifier

Mercury arc rectifier

Synchronous converter

Question 18 of 18