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Synchronous Motors

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

Zero
Maximum
None of the listed here
minimum

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Synchronous Motors
An over excited synchronous motor is used for

Fluctuating loads
Low torque loads
Variable speed loads
Power factor corrections

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

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Synchronous Motors
A 50 Hz synchronous motor runs at 200 rpm. The number of salient poles on the rotor are______

30
None of the listed here
16
36

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Synchronous Motors
When a synchronous motor is on no load, the torque angle is about ________

45° electrical
30° electrical
0° electrical
90° electrical

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Synchronous Motors
The induced e.m.f. in a synchronous motor working on leading power factor will be

None of these
more than the supply voltage
equal to the supply voltage
less than the supply voltage

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