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SYNCHRONOUS MOTORS

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

Lower stability limit
Good speed regulation
High stability limit
Good voltage regulation

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

Rotor excitation
None of the listed here
Rotor speed
Flux density

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Synchronous Motors
The construction of a synchronous motor ressembles

An alternator
A series motor
An induction motor
A rotary converter

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Synchronous Motors
A synchronous motor develop maximum power when load angle is

120°
60°
90°
45°

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Synchronous Motors
A synchronous motor can operate at

Lagging, leading and unity power factors
Leading power factor
Lagging power factor only
Unity power factor only

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