A 3phase induction motor has negligible stator impedance the

A 3-phase induction motor has negligible stator impedance. the speed of the motor is controlled by rotor resistance at constance torque load. unde these conditions the slip fo the motor is directly proportional to :

A.) rotor resistance

B.) inversely proportional to rotor resistance

C.) independent of rotor resistance

D.) varies with rotor stand still resistance

Solution

We know that SLIP MAX =R2/X2. IE at that this Slip motor attains a max Torque. AS The Rotor Resistance is increased by adding external Resistance which is possible for a Slip ring induction Motor. So the the slip at which max torque occurs also changes. Hence the slip of Induction Motor is directly Proportional to the Rotor Resistance that is R2.

Hence option A is correct answer.