The starting torque of a three phase induction motor can be increased by
- A. Increasing rotor reactance
- B. Increasing rotor resistance
- C. Increasing stator resistance
- D. None of the above
Answer: B. Increasing rotor resistance
Explanation: Starting torque Tst ∝ R2/(R2² + X2²). Increasing rotor resistance R2 shifts the maximum torque toward standstill (s = 1), thereby increasing starting torque.