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Synchronous Motors

Synchronous Motors
The pull out torque of a practical synchronous motor will occur when the torque angle is about _____

45°
75°
0°
30°

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Synchronous Motors
The back emf in the stator of a synchronous motor depends on

Rotor speed
None of the listed here
Flux density
Rotor excitation

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Synchronous Motors
When pull-out torque occurs in a synchronous motor, the poles of the rotor are _______

Mid way between N and S poles of stator
Coincident with statorbpoles
None of the listed here
45° (electrical) behind stator poles

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Synchronous Motors
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as

pull-up torque
pull-in torque
pull-out torque
None of these

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

90°
45°
60°
120°

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Synchronous Motors
A synchronous capacitor is an over excited motor running at ________

Full load
None of the listed here
Half full load
No load

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