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Synchronous Motors

Synchronous Motors
A synchronous motor can be used as a synchronous capacitor when it is

Over loaded
Over excited
Under loaded
Under excited

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

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

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

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Synchronous Motors
The mechanical power developed by a synchronous motor is independent of _________.

Field excitation
Applied stator voltage
Torque angle
Speed

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Synchronous Motors
The armature current of a synchronous motor will be minimum for ______ power factor.

None of the listed here
Unity
0.8 lagging
0.8 leading

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Synchronous Motors
The speed regulation of a synchronous motor is always

1%
0.5%
Positive
Zero

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