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Synchronous Motors

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

Flux density
All of the listed here
Horse power rating
Speed

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Synchronous Motors
For power factor correction, synchronous motors operate at

no-load and greatly over-excited fields
normal load with minimum excitation
no-load and under-excited fields
normal load with zero excitation

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Synchronous Motors
A synchronous motor runs at speed ranging from ______

150 to 1800 rpm
None of the listed here
1800 to 3600 rpm
3600 to 6000 rpm

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

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

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

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Synchronous Motors
A synchronous motor runs at only one speed because it ______

None of the listed here
Has no losses
Has a damper winding
Is a doubly fed machine

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