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Synchronous Motors

Synchronous Motors
The rotor copper losses, in a synchronous motor, are met by

supply lines
motor input
armature input
c. source

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Synchronous Motors
In a synchronous motor, the rotor copper loss are met by ______

Dc source
Motor input
Armature input
Supply lines

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Synchronous Motors
An important advantage of a synchronous motor over wound round induction motor is that

its speed may be controlled more easily
its speed is independent of supply frequency
None of these
its power factor may be varied at will

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Synchronous Motors
In a 3-phase synchronous motor, the negative phase sequence exists when the motor is

over-loaded
under-loaded
None of these
supplied with unbalanced voltage

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Synchronous Motors
A synchronous motor will always stop when

Load in motor varies
Excitation winding gets disconnected
Supply voltage fluctuates
Supply voltage frequency changes

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

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