SYNCHRONOUS MOTORS QUIZ

Mostly, synchronous motors are of

Smooth cylindrical type machines

Salient pole type machines

Alternator type machines

Induction type machines

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The speed regulation of a synchronous motor is always

Positive

Zero

0.5%

1%

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A rotary converter can also be run as a

Dc shunt generator

Synchronous motor

Dc series generator

Dc compound generator

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

The same as

None of the listed here

More than

Less than

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In a synchronous motor which loss varies with load ?

Core loss

Bearing friction loss

Copper loss

Windage loss

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While running, a synchronous motor is compelled to run at synchronous speed because of _______

Magnetic locking between stator and rotor poles

Damper winding in its pole faces

Compulsion due to lenz's law

Induced emf in rotor field winding by stator flux

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Which of the following motors is non self starting?

Synchronous motor

Wound rotor induction motor

Squirrel cage induction motor

Dc series motor

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Change of D.C. excitation of a synchronous motor changes

Motor speed

Any of the above

Power factor of power drawn by the motor

Applied voltage of the motor

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A synchronous motor with large air gap has

A higher value of stability limit

All of the listed here

A small value of inherent regulation

A higher synchronizing power which makes the machine less sensitive to load variations

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The pull out torque of a synchronous motor will ______ as the field excitation is increased.

Remain unchanged

Increase

Decrease

None of the listed here

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