A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6-poles. The slip of the machine will be
A. 0.01
B. 0.02
C. 0.03
D. 0.04
Answer: Option D
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Nr = 960
p=6
f=50
ns =120*50/6=1000
f= Formula to find slip = (ns - n) /ns
1000-960/1000=0.04
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