Synchronous Motor MCQs Part 2

Synchronous Motor MCQs Part 2

A 3-phase synchronous motor is running in clockwise direction. When direction of its field current is reversed

A 3-phase synchronous motor is running in clockwise direction. When direction of its field current is reversed:

1. Motor will continue to run in same direction
2. Winding of motor will burn
3. Motor will run in reverse direction
4. Motor will stop

Correct answer: 1. Motor will continue to run in same direction

A synchronous motor can be made self-starting by providing

A synchronous motor can be made self-starting by providing:

1. Damper winding on stator
2. Damper winding on rotor poles
3. Damper winding on stator as well as rotor poles
4. None of the above

Correct answer: 4. None of the above

Armature of a synchronous machine is

Armature of a synchronous machine is:

1. Armature is associated with large power as compared to the field circuits
2. Of reducing number of slip rings on the rotor
3. Of difficulty of providing high voltage insulation on rotor
4. All of these

Correct answer: 4. All of these

Change in DC excitation of a synchronous motor changes

Change in DC excitation of a synchronous motor changes:

1. Motor speed
2. Applied voltage of the motor
3. Power factor of power drawn by the motor
4. Any of the above

Correct answer: 3. Power factor of power drawn by the motor

Damper windings are provided in synchronous motor on

Damper windings are provided in synchronous motor on:

1. Rotor shaft
2. Stator frame
3. Pole faces
4. None of these

Correct answer: 3. Pole faces