Calculate - Ratio of starting torque to maximum torque

Q.  A 16 pole, 50 Hz, star connected three phase induction motor has rotor resistance of 0.012 ohm per phase and rotor reactance of 0.220 ohm per phase at standstill. Its full load torque is at speed of 220 rpm. Ratio of its starting torque to maximum torque is
- Published on 23 Oct 15

a. 0.1208
b. 0.1087
c. 0.1102
d. 0.1012

ANSWER: 0.1087

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