Q.

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 poorer power factor?

A. a
B. b
C. both a and b
D. neither a nor b
Answer» A. a
Explanation: due to larger air gap of motor a, it will need more of exciting current. so the no load angle will increase and power factor will deteriorate.
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