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Synchronous Motors

Synchronous Motors
The back emf in the stator of a synchronous motor depends on

None of the listed here
Rotor excitation
Flux density
Rotor speed

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Synchronous Motors
For reciprocating compressor, the synchronous motor is designed to have pull in torque of about ______ times the full load torque.

5
0.5
2
6

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Synchronous Motors
The angle between the rotor poles and stator poles, in a synchronous motor, is known as

Angle of retardation
Power factor angle
Synchronising angle
Torque angle

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Synchronous Motors
The rotor of synchronous motor is excited with direct current when the motor _____

None of the listed here
Is at standstill
Approches synchronous speed
Approches half synchronous speed

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Synchronous Motors
For the same active power consumed, the stator current of a synchronous motor is ______ that of a 3 phase induction motor.

More than
Less than
The same as
None of the listed here

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Synchronous Motors
The magnitude of field flux in a 3-phase synchronous motor

Varies with the load
Varies with speed
Varies with power factor
Remains constant at all loads

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