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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?

730 rpm
1440 rpm
2880 rpm
1000 rpm

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Three Phase Induction Motors
The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______

65%
40%
90%
None of the listed here

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Three Phase Induction Motors
The injected e.m.f. in the rotor of induction motor must have

High value for the satisfactory speed control
The same phase as the rotor e.m.f.
The same frequency as the slip frequency
Zero frequency

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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

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

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

One
Three
Four
Two

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Three Phase Induction Motors
In induction motor, percentage slip depends on

Supply frequency
Supply voltage
Copper losses in motor
None of these

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