Discussion
The chief objection to rotor resistance control is that
Answer: D
Correct answer: the slip power is wasted in the resistance
The rotor circuit carries \( sP_g \), and in this scheme all of it is dissipated as heat in the external resistors. At 30 per cent slip that is nearly a third of the air gap power thrown away, so the efficiency is roughly \( 1 - s \). The method does reduce the speed below synchronous, and it leaves the maximum torque untouched; it is the wasted energy that condemns it, and the slip power recovery schemes exist precisely to reclaim it.
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