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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
The magnitude of field flux in a 3-phase synchronous motor

Varies with the load
Varies with speed
Remains constant at all loads
Varies with power factor

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Synchronous Motors
A synchronous motor working at leading power factor can be used as

Phase advancer
Mechanical synchronizer
Noise generator
Voltage booster

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

Torque angle
Speed
Applied stator voltage
Field excitation

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Synchronous Motors
When the field of a synchronous motor is under-excited, the power factor will be

leading
unity
zero
lagging

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

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

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