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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 _____

75°
45°
30°
0°

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

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Synchronous Motors
An important advantage of a synchronous motor over wound round induction motor is that

None of these
its power factor may be varied at will
its speed is independent of supply frequency
its speed may be controlled more easily

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Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be

lagging
zero
leading
unity

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Synchronous Motors
The rotor of a synchronous motor is

Salient pole type
Nonsalient pole type
None of the listed here
Identical to that of a dc motor

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

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

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