Discussion
An induction machine's torque at a given slip varies with the applied voltage as
Answer: C
Correct answer: the square of the voltage
Torque depends on the product of flux and rotor current, and both are proportional to the applied voltage, so torque varies as its square. The consequence is severe: a ten per cent voltage drop removes nearly twenty per cent of the torque, which is why supply voltage is the first thing to check when a machine fails to start.
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