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An 8 poles,230V,60Hz delta connected three-phase induction motor has a rotor impedance of 0.025+j0.1 phase the...

An 8 poles,230V,60Hz delta connected three-phase induction motor has a rotor impedance of 0.025+j0.1 phase the stator winding impedance is negligible and the Xm=infinity.Determine

a- the speed at maximum torque.

b-the maximum torque.

c-the staring torque as a percentage of the maximum torque.

d-what additional resistance must be inserted in the rotor circuit to make the starting torque equal to 75% of the maximum torque?

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