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Synchronous Motors

Synchronous Motors
A synchronous motor is a ______ motor.

None of the listed here
Variable pf
Singly fed
Variable speed

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

Zero
2 percent
4 percent
10 percent

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Synchronous Motors
A synchronous motor with large air gap has

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

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Synchronous Motors
A synchronous motor runs at only one speed because it ______

Has a damper winding
Has no losses
Is a doubly fed machine
None of the listed here

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Synchronous Motors
The back emf in the stator of a synchronous motor depends on

Rotor excitation
Flux density
Rotor speed
None of the listed here

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Synchronous Motors
The rotor of a synchronous motor is

Identical to that of a dc motor
Salient pole type
None of the listed here
Nonsalient pole type

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