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Three Phase Induction Motors

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

Same
Any of the listed here
Smaller
Bigger

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Three Phase Induction Motors
At no load the rotor core loss of a 3 phase induction motor is

Large
Practically zero
None of the listed here
Small

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

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

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

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

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Three Phase Induction Motors
A four speed squirrel cage induction motor uses______ stator windings.

Two
One
Three
Four

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Three Phase Induction Motors
At starting of a double squirrel cage induction motor _______

Lower cage winding has low reactance
Outer cage winding has good pf
None of the listed here
Lower winding is more effective

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