Discussion
Assertion (A): Rotor resistance control is inefficient.
Reason (R): Reducing the speed increases the slip and hence the rotor loss.
Select the correct option.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
The assertion is true: rotor resistance control is inefficient. The reason is true and explains it exactly. Speed is reduced only by increasing the slip, and the rotor loss is \( sP_g \), all of it burnt in the external resistors. Running at 25 per cent slip means a quarter of the air gap power is thrown away, so the efficiency falls roughly as \( 1-s \).
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