Discussion
A 4-pole, 3-phase induction motor is supplied through a 50 Hz supply. If it runs at the speed of 1410 rpm, Find the slip.
Answer: D
The slip is 6 %. The synchronous speed of a 4-pole motor on a 50 Hz supply is 1500 rpm, and the slip is the difference between this and the rotor speed, divided by the synchronous speed.
\[ N_s = \frac{120 \times 50}{4} = 1500\ \text{rpm} \]
\[ s = \frac{1500 - 1410}{1500} = 0.06 = 6\% \]
The values 3 %, 4 % and 5 % would give speeds of 1455, 1440 and 1425 rpm. So the fourth option is correct.
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