Discussion
The chief drawback of stator voltage control is
Answer: D
Correct answer: large rotor loss at reduced speed
Speed is reduced by increasing the slip, and the rotor copper loss is \( sP_g \). Running at 50 per cent slip means half the air gap power is burnt in the rotor, inside the machine, where it is hard to remove. This restricts the method to small machines and to loads whose power demand falls quickly with speed, which limits the running time spent at high slip.
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