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Synchronous Motors

Synchronous Motors
The size of a synchronous motor decreases with the increase in

Speed
All of the listed here
Flux density
Horse power rating

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

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

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

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Synchronous Motors
The magnitude of field flux in a 3-phase synchronous motor

Varies with the load
Varies with power factor
Varies with speed
Remains constant at all loads

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Synchronous Motors
In order to to reverse the direction of a synchronous motor, _______

Change supply frequency
Reduce dc field excitation to zero
Interchange any two stator lines
None of the listed here

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Synchronous Motors
The percentage slip in case of a synchronous motor is

1
0.005
zero
0.01

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