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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.

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

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

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

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always less than the number of
Always greater than the number of
Either more or less than the number of
Always eqaul to the number of

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Three Phase Induction Motors
The injected e.m.f. in the rotor of induction motor must have

The same phase as the rotor e.m.f.
Zero frequency
High value for the satisfactory speed control
The same frequency as the slip frequency

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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 supply frequency
Changing winding resistance
Changing number of poles

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

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

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MORE MCQ ON Three Phase Induction Motors

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