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Synchronous Motors

Synchronous Motors
The shaft of synchronous motor is made of

Mild steel
Stainless steel
Chrome steel
Alcino

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Synchronous Motors
Mostly, synchronous motors are of

Smooth cylindrical type machines
Salient pole type machines
Alternator type machines
Induction type machines

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Synchronous Motors
A synchronous machine with low value of short-circuit ratio has

good voltage regulation
good speed regulation
lower stability limit
high stability limit

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Synchronous Motors
The direction of rotation of a synchronous motor can be reversed by reversing,

None of the listed here
Supply phase sequence
Current to field winding
Polarity of rotor poles

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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
Which of the following motors is non self starting?

Synchronous motor
Dc series motor
Wound rotor induction motor
Squirrel cage induction motor

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