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Synchronous Motors

Synchronous Motors
Most of the synchronous motors are _______ power factor metors.

0.8 leading
0.8 lagging
0.5 leading
Unity

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Synchronous Motors
A synchronous motor runs at only one speed because it ______

Is a doubly fed machine
Has a damper winding
Has no losses
None of the listed here

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Synchronous Motors
If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then

it runs at a slower speed
it runs at a very high speed
it continues to run at the same speed
the motor stops

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

supply voltage
maximum value of coupling angle
direction of rotation
rotor excitation

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Synchronous Motors
A synchronous motor is cheaper than 3-phase induction motor for _____

Low speed, high output
High speed, high output
High speed, low output
None of the listed here

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Synchronous Motors
A synchronous motor is a ______ motor.

None of the listed here
Variable pf
Variable speed
Singly fed

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