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Synchronous Motors

Synchronous Motors
A synchronous motor can be used as a synchronous capacitor when it is

Under excited
Under loaded
Over excited
Over loaded

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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
Polarity of rotor poles
Current to field winding

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Synchronous Motors
In a synchronous motor, the maximum power developed depends on all of the following except

supply voltage
maximum value of coupling angle
rotor excitation
direction of rotation

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Synchronous Motors
The shaft of synchronous motor is made of

Mild steel
Chrome steel
Stainless steel
Alcino

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

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

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Synchronous Motors
The construction of a synchronous motor ressembles

A series motor
An induction motor
A rotary converter
An alternator

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