A change of 5% in supply voltage to an induction motor will produce a change of approximately
- A. 5% in the rotor torque
- B. 7.5% in the rotor torque
- C. 10% in the rotor torque
- D. 25% in the rotor torque
Answer: C. 10% in the rotor torque
Explanation: Torque developed by an induction motor is proportional to V² (T ∝ V²). A 5% change in voltage produces ΔT/T ≈ 2(ΔV/V) = 2×5% = 10% change in rotor torque.