To study running & speed reversal of a 3-phase induction motor and record speed in both direction
1) An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 720 rpm. The frequency of the rotor current of the motor in Hz is __________
2) The frame of an induction motor is made of ______
3) Slip ring of an induction motor is usually made up of
4)A double squirrel-cage induction motor has