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Synchronous Motors

Synchronous Motors
When the synchronous motor runs at synchronous speed, the voltage induced in the damper winding is _____

Maximum
minimum
None of the listed here
Zero

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Synchronous Motors
If a synchronous motor is operating at a supply frequency of 50 cycles/second, then, rotor revolves at ______

100 cycles/second
25 cycles/ second
50 cycles/second
None of the listed here

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

VAR
kVAR
None of the listed here
MVAR

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Synchronous Motors
Synchronous motors are generally used in application requiring _______

Variable speed
Infrequent starting
Frequent stopping
Sudden application of heavy loads

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Synchronous Motors
Mostly, synchronous motors are of

Induction type machines
Salient pole type machines
Smooth cylindrical type machines
Alternator type machines

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

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

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