SYNCHRONOUS MOTORS QUIZ

In a synchronous motor, the maximum power developed depends on all of the following except

rotor excitation

direction of rotation

maximum value of coupling angle

supply voltage

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Dust and dirt accumulation on motor winding will result in

Shorting of coils

Rise in winding temperature

Increased core losses

Eddy current flow

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A synchronous machine with low value short circuit ratio has

Good speed regulation

Lower stability limit

Good voltage regulation

High stability limit

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In a synchronous motor which loss varies with load ?

Bearing friction loss

Copper loss

Core loss

Windage loss

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The size of a synchronous motor is determined by its _____

None of the listed here

kW rating

kVAR rating

kVA rating

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The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as

pull-in torque

pull-up torque

None of these

pull-out torque

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A synchronous capacitor is an over excited motor running at ________

None of the listed here

No load

Full load

Half full load

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If a synchronous motor is operating at a supply frequency of 50 cycles/second, then, rotor revolves at ______

25 cycles/ second

100 cycles/second

50 cycles/second

None of the listed here

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

Power factor of power drawn by the motor

Any of the above

Applied voltage of the motor

Motor speed

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A 50 Hz synchronous motor runs at 200 rpm. The number of salient poles on the rotor are______

16

36

None of the listed here

30

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