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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
0.5 leading
Unity
0.2 leading

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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
Four times
None of the listed here
Equal to

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Three Phase Induction Motors
Less maintenance troubles are experienced in terms of

Both squirrel cage and slip ring
Squirrel cage induction motor
None of the listed here
Slip ring induction motor

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Three Phase Induction Motors
5 H.P., 50Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest?

730 rpm
1000 rpm
2880 rpm
1440 rpm

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

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

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Three Phase Induction Motors
In medium sized induction motor, the slip is generally around

0.04 %
14%
0.4 %
4 %

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MORE MCQ ON Three Phase Induction Motors

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