A. at the unit value of slip
B. at the zero value of slip
C. at the value of the slip which makes rotor reactance per phase equal to the resistance per phase
D. at the value of the slip which makes the rotor reactance half of the roto
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A. at the unit value of slip
B. at the zero value of slip
C. at the value of the slip which makes rotor reactance per phase equal to the resistance per phase
D. at the value of the slip which makes the rotor reactance half of the roto
This Answer Is C,.
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This point of maximum torque is determined by the supply voltage to the motor and the rotor resistance per phase, R2. At this point, the torque is directly proportional to the slip, meaning that increasing the slip increases the torque and vice versa.
Therefore, in order to obtain maximum torque, the rotor resistance needs to be adjusted accordingly.