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Synchronous Motors

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

armature input
supply lines
motor input
c. source

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Synchronous Motors
Leading power factor synchronous motors cost ______ the unity pf motors.

More than
None of the listed here
Less than
About the same as

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

lagging
unity
leading
zero

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Synchronous Motors
A synchronous motor working at leading power factor can be used as

Phase advancer
Mechanical synchronizer
Noise generator
Voltage booster

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

Windage loss
Core loss
Bearing friction loss
Copper loss

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

90°
45°
60°
120°

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