Discussion
If that machine runs at 3 per cent slip, its rotor copper loss is
Answer: D
Correct answer: 0.84 kW
The rotor copper loss is the slip fraction of the air gap power: \[ 0.03 \times 28 = 0.84\ \mathrm{kW}. \] This relation is exact and it is the reason slip and efficiency are so closely tied - every per cent of slip is a per cent of the air gap power turned into heat in the rotor.
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