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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

Unity
0.5 leading
0.2 leading
0.2 lagging

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

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

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

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

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Three Phase Induction Motors
An induction motor is

Non self starting
Self starting with zero torque
Self starting with low torque
Self starting with high torque

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

Maximum at no load
Remains the same at all loads
Minimum at no load
None of the listed here

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Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

50 Hz
20 Hz
2 Hz
200 Hz

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