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Synchronous Motors

Synchronous Motors
The maximum speed variation in a 3 phase synchronous motor is

10 percent
4 percent
2 percent
Zero

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Synchronous Motors
The construction of a synchronous motor ressembles

An alternator
A series motor
An induction motor
A rotary converter

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Synchronous Motors
The speed of a synchronous motor

Always remains constant
None of the listed here
Increases as the load increases
Decreases as the load decreases

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

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

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

leading
lagging
unity
zero

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Synchronous Motors
The percentage slip in case of a synchronous motor is

0.005
1
zero
0.01

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