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Three Phase Induction Motors

Three Phase Induction Motors
The crawling in an induction motor is caused by

High loads
Low voltage supply
Harmonics developed in the rotor
Improper design of machine

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Three Phase Induction Motors
Size of a high speed motor as compared to low speed motor for the same HP will be

Same
Smaller
Bigger
Any of the listed here

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

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

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Three Phase Induction Motors
Reduced voltage starter can be used with

Squirrel cage as well as slip ring induction motor
None of these
Slip ring motor only but not with squirrel cage induction motor
Squirrel cage induction motor only but not with slip ring motor

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Three Phase Induction Motors
An induction motor with 1000 r.p.m. speed will have

8 poles
2 poles
4 poles
6 poles

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Three Phase Induction Motors
The air gap between stator and rotor of 3-phase induction motor ranges from ______

4 cm to 6 cm
2 cm to 4 cm
0.4 mm to 4 mm
1 cm to 2 cm

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MORE MCQ ON Three Phase Induction Motors

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