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Synchronous Motors

Synchronous Motors
The back e.m.f. of a synchronous motor depends on

load angle
load
speed
All of these

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Synchronous Motors
Power factor of a synchronous motor is unity when

The armature current is minimum
None of the listed here
The armature current is maximum
The armature current is zero

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Synchronous Motors
The maximum speed variation in a 3 phase synchronous motor is

10 percent
4 percent
2 percent
Zero

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Synchronous Motors
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is

twice
less
more
equal

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Synchronous Motors
Synchronous motor always run at

More than synchronous speed
None of the listed here
Less than synchronous speed
The synchronous speed

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Synchronous Motors
The rotor copper losses, in a synchronous motor, are met by

supply lines
motor input
c. source
armature input

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