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If induction motor air gap power is 11 KW and mechanically developed power is 2 KW, then rotor ohmic loss will be _________ KW.

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If induction motor air gap power is 11 KW and mechanically developed power is 2 KW, then rotor ohmic loss will be _________ KW.

(a) 8

(b) 10

(c) 9

(d) 11

This question was addressed to me during an online exam.

I'd like to ask this question from Traction Drives topic in portion Traction Drives of Electric Drives

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The correct option is (c) 9

The explanation: Rotor ohmic losses are due to the resistance of armature windings. Net input power to the rotor is equal to the sum of rotor ohmic losses and mechanically developed power. Rotor ohmic losses = Air gap power – Mechanical developed power = 11-2 = 9 KW.

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