Question

A four-pole, three phase induction motor runs at 1440 rpm. Supply voltage is 500 V at 50 Hz.
Mechanical power output is 20.3 H.P. and mechanical loss is 2.23 H.P. Calculate (i) mechanical power
developed, (ii) rotor copper loss, and (iii) efficiency

Answer 1

all powers given but how to input power ?

if input power find then efficiency will calculate easily