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What is the angle at which the value of the flux density should be for the calculation of mmf?

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What is the angle at which the value of the flux density should be for the calculation of mmf?

(a) 40°

(b) 60°

(c) 80°

(d) 70°

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I want to ask this question from Operating Characteristics topic in division Design of Single Phase Induction Motor of Design of Electrical Machines

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Correct answer is (b) 60°

To explain: The calculation of mmf should be based upon the value of the flux density. The value of flux density at 60° from the interpolar axis as far as gap and teeth are concerned.

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