The stating torque of the slip ring induction motor can be increased by adding__________?
Correct answer: B. external resistance to the rotor
- A. external inductance to the rotor
- B. external resistance to the rotor
- C. external capacitance to the rotor
- D. both resistance and inductance to rotor
Explanation
Adding external rotor resistance increases the starting torque of a slip-ring motor by moving the maximum-torque condition toward starting slip. External inductance would increase reactance and generally worsen the starting power factor.
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