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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.

Equal to
Greater than
None of the listed here
Smaller than

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Three Phase Induction Motors
The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

high resistance
Large slip
High reactance
Low resistance

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

600 rpm
300 rpm
1200 rpm
1000 rpm

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of rotor bars is generally ________

Prime number
Equal to stator poles
None of the listed here
Even number

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Three Phase Induction Motors
The crawling in an induction motor is caused by

Improper design of machine
High loads
Low voltage supply
Harmonics developed in the rotor

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Three Phase Induction Motors
In the circle diagram for induction motor, the diameter of the circle represents

Line voltage
Running torque
Rotor current
Slip

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