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SYNCHRONOUS MOTORS

Synchronous Motors
When a unity pf synchronous motor is operated at a leading pf, it results in _______

More than rated horseppwer output
More than rated rotor current
Less than rated horsepower output
None of the listed here

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Synchronous Motors
The rotor of synchronous motor is excited with direct current when the motor _____

Is at standstill
Approches synchronous speed
None of the listed here
Approches half synchronous speed

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

Maximum
minimum
None of the listed here
Zero

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Synchronous Motors
The speed of a synchronous motor can be changed by varying _______

None of the listed here
Supply frequency
Mechanical load
Field excitation

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Synchronous Motors
If a synchronous motor is operating at a supply frequency of 50 cycles/second, then, rotor revolves at ______

50 cycles/second
None of the listed here
25 cycles/ second
100 cycles/second

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