Power supply to a 10 pole induction motor is supplied by 4 pole alternator which is driven at 1500 RPM. If the motor runs with slip of 4%, what is its speed?
- A. 750 RPM
- B. 576 RPM
- C. 600 RPM
- D. 240 RPM
Answer: B. 576 RPM
Explanation: Alternator frequency = 4×1500/120 = 50 Hz; motor Ns = 120×50/10 = 600 rpm; N = 600×0.96 = 576 rpm.