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Three Phase Induction Motors

Three Phase Induction Motors
3-phase wound rotor morors are also called _____ motors.

Slip ring
Series
Synchronous
Commutator

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

Large
Practically zero
Small
None of the listed here

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

Supply frequency
Copper losses in motor
Supply voltage
None of these

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

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

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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
Four times
Two times
None of the listed here

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Three Phase Induction Motors
The complete circle diagram of induction motor can be drawn with the help of data found from

Stator resistance test
All of these
No-load test
Blocked rotor test

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