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Three Phase Induction Motors

Three Phase Induction Motors
In induction motor, percentage slip depends on

Copper losses in motor
Supply frequency
Supply voltage
None of these

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Three Phase Induction Motors
In an induction motor if air gap increased

Windage losses will be more
Bearing friction will reduce
Copper loss will reduce
The power factor will be low

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

High resistance
Low resistance
High inductance
None of the listed here

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Three Phase Induction Motors
A 3 phase induction motor is ________

Not easily maintainable
Essentially a constant speed motor
Very costly
A variable speed motor

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Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

1
0
0.5
0.1

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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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