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Synchronous Motors

Synchronous Motors
The ratio of starting torque to running torque in a synchronous motor is

Two
Zero
One
Infinity

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Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be

zero
unity
leading
lagging

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Synchronous Motors
Which of the following motors is non self starting?

Squirrel cage induction motor
Wound rotor induction motor
Synchronous motor
Dc series motor

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Synchronous Motors
Synchronous motors are generally used in application requiring _______

Infrequent starting
Frequent stopping
Variable speed
Sudden application of heavy loads

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Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor

Will fail to pull into step
Will refused ro start
Will not come upto speed
Will overheat in spots

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Synchronous Motors
A synchronous motor with large air gap has

All of the listed here
A higher value of stability limit
A small value of inherent regulation
A higher synchronizing power which makes the machine less sensitive to load variations

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