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Three Phase Induction Motors

Three Phase Induction Motors
The starting torque of an induction motor is maximum when rotor resistance per phase is _____ rotor reactance / phase.

Four times
None of the listed here
Two times
Equal to

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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
None of the listed here
Less rotor losses

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Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(S-1) × rotor input
(1-S) × rotor input
(1+S) × rotor input
S × rotor input

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Three Phase Induction Motors
At starting of a double squirrel cage induction motor _______

None of the listed here
Outer cage winding has good pf
Lower cage winding has low reactance
Lower winding is more effective

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

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

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Three Phase Induction Motors
An induction motor with 1000 r.p.m. speed will have

4 poles
8 poles
2 poles
6 poles

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