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Synchronous Motors

Synchronous Motors
A synchronous motor is a ______ motor.

None of the listed here
Singly fed
Variable pf
Variable speed

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Synchronous Motors
The mechanical power developed by a synchronous motor is independent of _________.

Applied stator voltage
Speed
Torque angle
Field excitation

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Synchronous Motors
In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then

the torque generated is maximum
the excitation is said to be hundred per cent
the motor is said to be fully loaded
the excitation is said to be zero per cent

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Synchronous Motors
When the synchronous motor runs at synchronous speed, the voltage induced in the damper winding is _____

None of the listed here
minimum
Maximum
Zero

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Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor

Will refused ro start
Will not come upto speed
Will fail to pull into step
Will overheat in spots

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Synchronous Motors
The standard full-load power factor ratings for synchronous motors are

unity or 0.8 lagging
zero or 0.8 leading
unity or zero
unity or 0.8 leading

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