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Synchronous Motors

Synchronous Motors
A synchronous motor can be used as a synchronous capacitor when it is

Over excited
Under loaded
Under excited
Over loaded

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Synchronous Motors
A synchronous motor develops maximum power when load angle is

120°
90°
45°
60°

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Synchronous Motors
The angle between the rotor poles and stator poles, in a synchronous motor, is known as

Angle of retardation
Power factor angle
Torque angle
Synchronising angle

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

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

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

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

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Synchronous Motors
The shaft of synchronous motor is made of

Mild steel
Alcino
Chrome steel
Stainless steel

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