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Three Phase Induction Motors

Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Same as full load torque
Negligible
Slightly more than full load torque
Low

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Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

99%
60 to 90%
95 to 98 %
80 to 90%

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

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

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Rotor emf
Rotor current
Shaft diameter
Rotor power factor

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Three Phase Induction Motors
A 3 phase induction motor is ________

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

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

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

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