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Synchronous Motors

Synchronous Motors
The speed regulation of a synchronous motor is always

Positive
0.5%
1%
Zero

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

supply lines
c. source
motor input
armature input

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Synchronous Motors
The pull out torque of a practical synchronous motor will occur when the torque angle is about _____

45°
75°
30°
0°

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Synchronous Motors
Dust and dirt accumulation on motor winding will result in

Shorting of coils
Increased core losses
Rise in winding temperature
Eddy current flow

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Synchronous Motors
A synchronous motor will always stop when

Supply voltage fluctuates
Excitation winding gets disconnected
Supply voltage frequency changes
Load in motor varies

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

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

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