engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Electrical Machines Three Phase Induction Motor
A three phase 4-pole induction motor runs at a speed of 1440 rpm on 500 V, 50 Hz mains. The shaft power developed by the motor is 20.3 HP. The rotational losses are 2.23 HP. Assuming no copper losses, the motor efficiency is
(Assume 1 HP = 735.5 W)
1
85.5%
2
90.1%
3
86.5%
4
88.7%