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Synchronous Motors

Synchronous Motors
The construction of a synchronous motor resembles

an induction motor
a rotary converter
a series motor
an alternator

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Synchronous Motors
An over excited synchronous motor behaves as _____

None of the listed here
A capacitor
A resistor
An inductor

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Synchronous Motors
The speed regulation of a synchronous motor is always

Zero
1%
Positive
0.5%

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

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Synchronous Motors
A synchronous motor is a ______ motor.

Singly fed
None of the listed here
Variable speed
Variable pf

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Synchronous Motors
The duration of sudden short-circuit test on a synchronous motor is usually about

one second
None of these
one minute
one hour

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