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Three Phase Induction Motors

Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

High inductance
High resistance
Low resistance
None of the listed here

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Three Phase Induction Motors
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

2880 rpm
1000 rpm
1440 rpm
730 rpm

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Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

None of the listed here
Equal to
Smaller than
Greater than

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Three Phase Induction Motors
The rotor of induction motor

Always revolves in the direction of stator flux
Always revolves in the direction opposite to stator flux
None of the listed here
Insufficient data

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Three Phase Induction Motors
The speed of a squirrel-cage induction motor can be controlled by all of the following except

Changing winding resistance
Changing supply frequency
Reducing supply voltage
Changing number of poles

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Three Phase Induction Motors
The rotor of an induction motor runs at

Below synchronous speed
Above synchronous speed
Any of the above
Synchronous speed

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