1.

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 BI had been asked this question in class test.This intriguing question originated from Principle of Operation topic in portion Induction Machines of Electrical Machines

Answer»

The CORRECT option is (a) A

The BEST I can explain: 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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