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Synchronous Motors

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

None of the listed here
Zero
Maximum
minimum

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Synchronous Motors
The percentage slip in case of a synchronous motor is

0.005
zero
1
0.01

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Synchronous Motors
When the field of a synchronous motor is under-excited, the power factor will be

zero
leading
unity
lagging

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Synchronous Motors
The construction of a synchronous motor ressembles

A rotary converter
A series motor
An alternator
An induction motor

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Synchronous Motors
Change of D.C. excitation of a synchronous motor changes

Power factor of power drawn by the motor
Any of the above
Applied voltage of the motor
Motor speed

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

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

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