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Synchronous Motors

Synchronous Motors
A three phase synchronous motor will have

One slip rings
Two slip rings
Three slip rings
No slip rings

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Synchronous Motors
Mostly, synchronous motors are of

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

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

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

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

10 percent
4 percent
Zero
2 percent

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Synchronous Motors
In a synchronous motor, the magnitude of stator back emf depends on _____

Speed of the rotor
Both the speed and rotor flux
Load on the motor
Dc excitation only

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Synchronous Motors
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then

the stator current will be very small
the back e.m.f. will be more than the supply voltage
the stator current will be zero
the stator current will be very high

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