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Three Phase Induction Motors

Three Phase Induction Motors
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.

10 to 15%
5%
15 to 20 %
30 to 50%

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

1.5 %
2%
4%
Less than 1%

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Three Phase Induction Motors
The frequency of rotor current in a 6-pole , 50 Hz, 3-phase induction motor running at 950 rpm is

1.5 Hz
5 Hz
2.5 Hz
0.05 Hz

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Three Phase Induction Motors
The speed of a squirrel-cage induction motor can be controlled by all of the following except

Reducing supply voltage
Changing number of poles
Changing winding resistance
Changing supply frequency

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

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

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

Frequency
Square of supply voltage
Rotor inductive reactance
All of the listed here

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MORE MCQ ON Three Phase Induction Motors

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