The name plate of a squirrel-cage four-pole induction motor has the following information: 25 hp, 220 volts, three-phase, 60 Hz, 830 rev/min, 64A line current. If the motor draws 20,800 watts when operating at full load, calculate:
a. Slip
b. Percent regulation if the no-load speed is 895 rpm
c. Power factor
d. Torque
e. Efficiency