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Three Phase Induction Motors

Three Phase Induction Motors
The power factor of an induction motor under no load conditions will be closer to

0.2 lagging
0.2 leading
Unity
0.5 leading

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

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

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

Equal to
None of the listed here
Two times
Four times

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Three Phase Induction Motors
The frame of an induction motor is usually made of

Cast iron
Aluminium
Silicon steel
Bronze

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of rotor bars is generally ________

None of the listed here
Even number
Equal to stator poles
Prime number

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

Half full load
Starting
Full load
No load

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