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Synchronous Motors

Synchronous Motors
The maximum speed variation in a 3 phase synchronous motor is

10 percent
2 percent
Zero
4 percent

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Synchronous Motors
When load on a synchronous motor is increased, its armature current is increased provided, it is ______

All of these
Under-excited
Over-excited
Normally excited

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Synchronous Motors
If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then

it continues to run at the same speed
it runs at a slower speed
the motor stops
it runs at a very high speed

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

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

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Synchronous Motors
A synchronous motor working at leading power factor can be used as

Mechanical synchronizer
Noise generator
Voltage booster
Phase advancer

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Synchronous Motors
By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?

By changing the load
By changing the supply frequency
By interchanging any two phases
By changing the applied voltage

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