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The ratio of the rotor gross power and air gap power is _______

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The ratio of the rotor gross power and air gap power is _______

(a) s

(b) 1-s

(c) 1+s

(d) 0

The question was asked in an online quiz.

Asked question is from Induction Motors in chapter Braking of DC Motors & Induction Motors of Electric Drives

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Correct option is (b) 1-s

The best I can explain: The ratio of the rotor gross power and air gap power is 1-s. The air gap power in the induction motor is Pg and the rotor gross power is (1-s)×Pg. The ratio is 1-s.

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