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Two three phase induction motors A and B are identical in all respects except that motor A has a larger air-gap than motor B. Which motor will have better full-load power factor?

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Two three phase induction motors A and B are identical in all respects except that motor A has a larger air-gap than motor B. Which motor will have better full-load power factor?

(a) A

(b) B

(c) Both A and B

(d) Neither A nor B

The question was posed to me by my college director while I was bunking the class.

Query is from Principle of Operation topic in portion Induction Machines of Electrical Machines

1 Answer

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Best answer
Right choice is (b) B

Explanation: At full load conditions, the excitation current is not very high and so the power factor improves.

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