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Three Phase Induction Motors

Three Phase Induction Motors
The induction motor has lagging power factor during

Both starting and operation
None of the listed here
Starting only
Operation only

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

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

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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 ______

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

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

No load
Full load
Half full load
Starting

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Three Phase Induction Motors
A high starting torque can be obtained in a 3phase induction motor by _______

Decreasing rotor resistance
Increasing rotor resistance
Increasing rotor reactance
None of the listed here

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Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

Low resistance
High resistance
High inductance
None of the listed here

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