A 50Hz 20 poles 3 phase I.M. has a full load slip 1.33%. Its rotor im – McqOptions

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1.	A 50Hz 20 poles 3 phase I.M. has a full load slip 1.33%. Its rotor impedance per phase on standstill is 0.02+j0.3ohms. Then the ratio of starting torque to the maximum torque is____.
A.	0.384
B.	0.527
C.	0.132
D.	0.854
Answer» D. 0.854

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