B2. (a) A4 pole, 380 V, 50 Hz, three-phase induction motor delivers an output power of 15 kW when the motor induces a ro

[answerhappygod]

B2 A A4 Pole 380 V 50 Hz Three Phase Induction Motor Delivers An Output Power Of 15 Kw When The Motor Induces A Ro 1 (33.15 KiB) Viewed 23 times

B2. (a) A4 pole, 380 V, 50 Hz, three-phase induction motor delivers an output power of 15 kW when the motor induces a rotor e.m.f. at a frequency of 3 Hz. The total stator copper loss and core loss is 600 W. If the rotational losses absorb a torque of 15 Nm, evaluate (1 mark) (i) the slip (ii) the motor speed in rev/min, and (iii) the motor input power. (4 marks) (5 marks) (b) A shunt D.C. motor is connected to a 200 V D.C. supply, and the motor draws an armature current of 15 A at 200 rev/min. If the armature resistance is 0.512, evaluate (i) the back e.m.f. induced on armature, the mechanical power developed by the motor, and (ii) the motor speed in rev/min if the torque is reduced by 40 %. (2 marks) (2 marks) (6 marks)