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Synchronous Motors

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

0.8 lagging
0.8 leading
Unity
None of the listed here

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Synchronous Motors
The maximum speed variation in a 3 phase synchronous motor is

Zero
10 percent
4 percent
2 percent

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Synchronous Motors
Power factor of a synchronous motor is unity when

The armature current is maximum
None of the listed here
The armature current is minimum
The armature current is zero

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Synchronous Motors
The construction of a synchronous motor resembles

an alternator
a rotary converter
a series motor
an induction motor

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Synchronous Motors
A synchronous motor can be started by

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

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

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

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