A three-phase induction motor used for a commercial application in Oman 50HZ runs at 584 rpm at no load and at 546 rpm at full load.    a) How many poles do this motor have? b) What is the percentage slip at full load?   c) The frequency of the rotor currents when slip is 7 % d) The frequency of the rotor currents at standstill.

A 3-phase, 60 Hz induction motor has 2 poles. If the slip is 2% at a certain load, determine  the synchronous speed and the speed of the rotor and the frequency of the induced e.m.f.’s in the rotor

22. A) Why is the power factor of a lightly loaded 3-phase squirrel-cage induction motor very low? a) most of the power supplied to the motor at light loads is magnetization or inductive power b) most of the power supplied to the motor at light loads is resistive power c) most of the power supplied to the motor at light loads is capacitive power d) none of the above B) What happens to the power factor as load is increased on the motor? a) the power factor increases b) the power factor deceases c) remains the same

A certain 60Hz, four-pole split-phase induction motor spins at 1760rpm when running with no torque load. Find its slip at no load. A. 1800rpm C. 1150rpmB. 90rpm D. 40rpm