A 6 pole, 50 Hz, 3-Φ induction motor is running at 950 rpm and has rotor Cu loss of 5kW. Its rotor input is ______ kW
- A. 100
- B. 10
- C. 95
- D. 5.3
Answer: A. 100
Explanation: Ns = 120×50/6 = 1000 rpm; Slip s = (1000 − 950)/1000 = 0.05. Rotor Cu loss = s × Rotor input ⇒ Rotor input = 5 kW / 0.05 = 100 kW.