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Synchronous Motors

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

One minute
One hour
None of the listed here
One second

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Synchronous Motors
Leading power factor synchronous motors cost ______ the unity pf motors.

About the same as
Less than
None of the listed here
More than

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

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

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

36
None of the listed here
30
16

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Synchronous Motors
An important advantage of a synchronous motor over wound round induction motor is that

its speed is independent of supply frequency
None of these
its power factor may be varied at will
its speed may be controlled more easily

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

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

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