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Synchronous Motors

Synchronous Motors
A synchronous motor can be started by

Provinding damper winding
Pony motor
Dc compound motor
All of the listed here

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Synchronous Motors
When a synchronous motor is on no load, the torque angle is about ________

30° electrical
90° electrical
45° electrical
0° electrical

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Synchronous Motors
A synchronous motor can be made self starting by providing

Damper winding on rotor poles
Damper winding on stator
None of the listed here
Damper winding on stator as well as rotor poles

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Synchronous Motors
Mostly, synchronous motors are of

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

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Synchronous Motors
A synchronous motor is cheaper than 3-phase induction motor for _____

High speed, high output
Low speed, high output
High speed, low output
None of the listed here

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

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

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