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Synchronous Motors

Synchronous Motors
The maximum speed variation in a 3 phase synchronous motor is

Zero
4 percent
2 percent
10 percent

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Synchronous Motors
The direction of rotation of a synchronous motor can be reversed by reversing,

Polarity of rotor poles
None of the listed here
Current to field winding
Supply phase sequence

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

armature input
supply lines
c. source
motor input

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Synchronous Motors
A synchronous motor can be started by

All of the listed here
Pony motor
Provinding damper winding
Dc compound motor

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Synchronous Motors
Leading power factor synchronous motors cost ______ the unity pf motors.

More than
About the same as
Less than
None of the listed here

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Synchronous Motors
Most of the synchronous motors are _______ power factor metors.

0.8 leading
0.8 lagging
Unity
0.5 leading

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