(b) A 3-phase, 415 V, 50 Hz, 4-pole-pair, star-connected induction motor is 90% efficient when operated at a slip of 3% at rated voltage and frequency. It has the following equivalent circuit...

Extracted text: (b) A 3-phase, 415 V, 50 Hz, 4-pole-pair, star-connected induction motor is 90% efficient when operated at a slip of 3% at rated voltage and frequency. It has the following equivalent circuit impedances referred to the stator. R1= 0.50 0, XI = 1.20 Q, Xm = 25.00, R'z = 0.35 2, X'2 = 1.202 (1) Describe with the aid of a diagram the causes of losses associate with the machine. () Calculate the motor speed. () Draw a simplified per-phase equivalent circuit of the motor, calculate the mechanical output power and calculate core losses (in watts) assuming negligible rotational losses.