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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
2880 rpm
1440 rpm
1000 rpm

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

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

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Three Phase Induction Motors
An induction motor is preferred to a dc motor because it _______

Has simple and rugged construction
None of the listed here
Provides high starting torque
Provides fine speed control

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Three Phase Induction Motors
The term cogging is associated with

Three phase transformer
Compound generators
Dc series motors
Induction motors

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Three Phase Induction Motors
In a 3 phase induction motor, the rotor speed is _____ the synchronous speed.

None of the listed here
Smaller than
Greater than
Equal to

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

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

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