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Synchronous Motors

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

30
None of the listed here
36
16

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Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be

zero
unity
leading
lagging

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Synchronous Motors
The direction of rotation of a synchronous motor can be reversed by reversing,

None of the listed here
Supply phase sequence
Current to field winding
Polarity of rotor poles

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

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

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Synchronous Motors
A synchronous motor develop maximum power when load angle is

120°
90°
60°
45°

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Synchronous Motors
The pull out torque of a synchronous motor will ______ as the field excitation is increased.

Increase
None of the listed here
Remain unchanged
Decrease

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