ISRO Electrical Engineering (EE) 2013 - Question 37

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If the full-load speed of a 3-phase, 50Hz induction motor is 950 r.p.m, what is its half load speed nearly equal to?

  • A. 100 r.p.m
  • B. 450 r.p.m
  • C. 1900 r.p.m
  • D. 975 r.p.m

Answer: D. 975 r.p.m

Explanation: Ns = 1000 rpm; full-load slip 5 %; half-load slip ≈ 2.5 % gives about 975 rpm.

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