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Three Phase Induction Motors

Three Phase Induction Motors
The reactance of the rotor circuit of a 3-phase induction motor is maximum at

No load
Starting
Full load
Half full load

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Three Phase Induction Motors
An induction motor is so called because its operation depends on

Mutual induction
Self induction
Hysteresis
Eddy currents

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Three Phase Induction Motors
The starting torque of a 3-phase induction motor is _______ supply voltage.

Independent of
Directly proportional to sqaure of
None of the listed here
Directly proportional to

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

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

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Three Phase Induction Motors
The low power factor of induction motor is due to

Rotor leakage reactance
All of these
Stator reactance
The reactive lagging magnetizing current necessary to generate the magnetic flux

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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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