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Synchronous Motors

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

unity
leading
zero
lagging

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Synchronous Motors
The efficiency of a properly designed synchronous motor will usually fall in range

85 to 95%
99 to 99.5%
60 to 70%
75 to 80%

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

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

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

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

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Synchronous Motors
For power factor correction, synchronous motors operate at

normal load with minimum excitation
no-load and greatly over-excited fields
normal load with zero excitation
no-load and under-excited fields

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Synchronous Motors
When the synchronous motor is pulled out of synchronism, the stator current _______

Remains unchanged
Is increased too much
Becomes zero
Is decreased too much

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