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Three Phase Induction Motors

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
1440 rpm
730 rpm
1000 rpm

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

Leakage reactances are increased
Leakage reactances are decreased
None of the listed here
No load current is decreased

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

Increasing rotor reactance
Increasing rotor resistance
Decreasing rotor resistance
None of the listed here

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Three Phase Induction Motors
The cogging of an induction motor can be avoided by

Proper ventilation
Using DOL starter
Auto transformer starter
Having number of rotor slots more or less than the number of stator slots

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Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

None of the listed here
Partly star and partly delta
Delta
Star

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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 ______

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

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