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Three Phase Induction Motors

Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

1-S
1/S
S
S/1-S

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Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

None of the listed here
10 to 20 %
20 to 30 %
2 to 5 %

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Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

Pole changing
Rheostatic control
Cascade control
None of the listed here

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Uniform torque
Greater mechanical strength
Less rotor losses
None of the listed here

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

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

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Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

200 Hz
2 Hz
50 Hz
20 Hz

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MORE MCQ ON Three Phase Induction Motors

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