The full-load stator losses and the rotational looses of a 40 kW induction motor amount to 1.5 kW and 0.8 kW respectively. The machine has a full-load slip of 0.04 per unit. Determine at full load the...

The full-load stator losses and the rotational looses of a 40 kW induction motor amount to 1.5 kW and 0.8 kW respectively. The machine has a full-load slip of 0.04 per unit. Determine at full load the following:

(1) The mechanical power developed in the rotor in kW.

(2) The electro-mechanical power in kW.

(3) The per phase rotor copper losses in watts.

(4) The % efficiency of the motor.