Discussion
An induction motor takes 20 kW across its air gap while running at 5 per cent slip. Its rotor copper loss is
Answer: B
Correct answer: 1 kW
Rotor copper loss is the slip times the air gap power:
\[ P_{cu,r} = sP_g = 0.05 \times 20 = 1 \text{ kW} \]The 19 kW figure is the mechanical power, which is what remains, and 0.05 kW would follow from multiplying the slip by 1 kW rather than by the air gap power.
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