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Three Phase Induction Motors

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

Greater than
Smaller than
Equal to
None of the listed here

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Three Phase Induction Motors
Insertion of resistance in the rotor of an induction motor to develop a given torque

Increases the rotor current
Decreases the rotor current
Rotor current becomes zero
Rotor current remains same

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Three Phase Induction Motors
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

60 Hz
50 Hz
None of the listed here
25 Hz

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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

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

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Three Phase Induction Motors
A four speed squirrel cage induction motor uses______ stator windings.

One
Two
Three
Four

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Three Phase Induction Motors
For the same kVA rating, the leakage flux in induction motor is _______ that of transformer.

More than
Less than
About the same
None of the listed here

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