A 4 pole, 50Hz , 3 phase I M is running at 1425rpm on full load havin – McqOptions

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1.	A 4 pole, 50Hz , 3 phase I M is running at 1425rpm on full load having rotor impedance per phase on standstill as 0.4+j2Î©. The external resistance required in the rotor per phase to get maximum torque at start is ___.
A.	0.2
B.	1.6
C.	0.8
D.	0.4
Answer» C. 0.8

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