GATE 2022 IN – Question 29

Electrical Circuits and Machines · Transformers and electrical machines · 1 mark · Numerical answer

A 440 V, 8 kW, 4-pole, 50 Hz, star-connected induction motor has a full load slip of 0.04. The rotor speed (in rpm) at full load is _________ (round off to one decimal place)

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Correct answer: 1440.0 to 1440.0

Explanation

Synchronous speed is 120f/P=120×50/4=1500 rpm. Rotor speed is (1−s)Ns=0.96×1500=**1440.0 rpm**.