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Synchronous Motors

Synchronous Motors
In a synchronous motor which loss varies with load ?

Bearing friction loss
Copper loss
Core loss
Windage loss

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Synchronous Motors
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as

pull-out torque
pull-up torque
pull-in torque
None of these

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Synchronous Motors
While running, a synchronous motor is compelled to run at synchronous speed because of _______

Damper winding in its pole faces
Induced emf in rotor field winding by stator flux
Compulsion due to lenz's law
Magnetic locking between stator and rotor poles

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Synchronous Motors
The armature current of a synchronous motor will be minimum for ______ power factor.

0.8 leading
0.8 lagging
None of the listed here
Unity

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

None of these
one hour
one minute
one second

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Synchronous Motors
The net armature voltage of a synchronous motor is equal to the

arithmetic difference of Eb and V
vector difference of Eh and V
arithmetic sum of Eb and V
vector sum of Eb and V

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