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Synchronous Motors

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

None of the listed here
Flux density
Rotor excitation
Rotor speed

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Synchronous Motors
The operating speed of a synchronous motor can be changed to new fixed value by

using brakes
changing frequency
changing the load
changing the supply voltage

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Synchronous Motors
Synchronous motors are generally used in application requiring _______

Variable speed
Frequent stopping
Sudden application of heavy loads
Infrequent starting

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Synchronous Motors
Which of the following motors is non self starting?

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

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Synchronous Motors
The back e.m.f. of a synchronous motor depends on

speed
load angle
All of these
load

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Synchronous Motors
A synchronous motor can develop synchronous torque

below or above synchronous speed
only at synchronous speed
when under loaded
while over-excited

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