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Synchronous Motors

Synchronous Motors
When the field of a synchronous motor is under-excited, the power factor will be

zero
lagging
unity
leading

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Synchronous Motors
In case one phase of a three-phase synchronous motor is short-circuited the motor will

run with excessive vibrations
take less than the rated load
not start
run at 2/3 of synchronous speed

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

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

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Synchronous Motors
The angle between the rotor poles and stator poles, in a synchronous motor, is known as

Power factor angle
Synchronising angle
Angle of retardation
Torque angle

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

Unity
0.8 leading
0.8 lagging
0.5 leading

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Synchronous Motors
In a synchronous motor, the rotor copper loss are met by ______

Dc source
Motor input
Supply lines
Armature input

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