Discussion
The starting torque of an induction motor corresponds to a slip of
Answer: D
Correct answer: unity
Starting means standstill, so \( N = 0 \) and
\[ s = \frac{N_s - 0}{N_s} = 1 \]Slip zero is synchronous speed, where no torque is developed at all. The slip of maximum torque and the rated full-load slip are both particular operating points on the characteristic and are neither of them the starting condition.
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