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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

Full load
Starting
Half full load
No load

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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.

Two times
Equal to
None of the listed here
Four times

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Three Phase Induction Motors
The shaft of induction motor is made of

Stiff
Any of the listed here
Flexible
Hollow

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Three Phase Induction Motors
The crawling in an induction motor is caused by

Improper design of machine
High loads
Harmonics developed in the rotor
Low voltage supply

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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 ______

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

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

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