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If induction motor rotor power is 26 KW and gross developed power is 21 KW, then rotor ohmic loss will be _________ KW.

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If induction motor rotor power is 26 KW and gross developed power is 21 KW, then rotor ohmic loss will be _________ KW.

(a) 5

(b) 6

(c) 7

(d) 8

I had been asked this question during a job interview.

The doubt is from Traction Drives in chapter Traction Drives of Electric Drives

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Correct answer is (a) 5

Best 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=26-21=5 KW.

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