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Synchronous Motors

Synchronous Motors
The pull out torque of a synchronous motor is generally ______ times its full-load torque.

1.25 to 3.5
6 to 9
0.5
5 to 10

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Synchronous Motors
Power factor of a synchronous motor is unity when

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

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Synchronous Motors
The mechanical power developed by a synchronous motor is ______ stator voltage.

Invesely proportional to
Independent of
Directly proportional to
Directly proportional to square of

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Synchronous Motors
The shaft of synchronous motor is made of

Chrome steel
Mild steel
Stainless steel
Alcino

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Synchronous Motors
An over excited synchronous motor behaves as _____

An inductor
A resistor
None of the listed here
A capacitor

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Synchronous Motors
A synchronous motor with large air gap has

A higher value of stability limit
A higher synchronizing power which makes the machine less sensitive to load variations
All of the listed here
A small value of inherent regulation

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