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Synchronous Motors

Synchronous Motors
The duration of sudden short-circuit test on a synchronous motor is usually about

one second
one hour
one minute
None of these

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Synchronous Motors
A synchronous motor runs at speed ranging from ______

1800 to 3600 rpm
None of the listed here
3600 to 6000 rpm
150 to 1800 rpm

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Synchronous Motors
An over excited synchronous motor behaves as _____

A resistor
An inductor
None of the listed here
A capacitor

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Synchronous Motors
A synchronous motor develop maximum power when load angle is

90°
60°
120°
45°

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

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

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Synchronous Motors
The induced e.m.f. in a synchronous motor working on leading power factor will be

equal to the supply voltage
more than the supply voltage
None of these
less than the supply voltage

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