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Three Phase Induction Motors

Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

20 to 30 %
None of the listed here
10 to 20 %
2 to 5 %

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Three Phase Induction Motors
For higher efficiency of 3-phase induction motor, the slip should be

As small as possible
Large
1
Very large

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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

200 Hz
50 Hz
2 Hz
20 Hz

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

Supply voltage
Copper losses in motor
None of these
Supply frequency

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Three Phase Induction Motors
The starting torque of a 3-phase induction motor is _______ supply voltage.

Independent of
Directly proportional to sqaure of
None of the listed here
Directly proportional to

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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
The power factor will be low
Copper loss will reduce

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MORE MCQ ON Three Phase Induction Motors

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