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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______

36
None of the listed here
16
30

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Synchronous Motors
The back e.m.f. of a synchronous motor depends on

All of these
load
load angle
speed

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Synchronous Motors
The rotor of synchronous motor is excited with direct current when the motor _____

None of the listed here
Approches synchronous speed
Is at standstill
Approches half synchronous speed

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

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

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Synchronous Motors
In a synchronous motor, the magnitude of stator back emf depends on _____

Speed of the rotor
Load on the motor
Both the speed and rotor flux
Dc excitation only

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Synchronous Motors
The capacity of a synchronous capacitor is generally in the range of

MVAR
VAR
None of the listed here
kVAR

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