a) The power supplied to a three-phase induction motor is 32kW and the stator losses are 1200W. If the slip is 5% , determine i. The rotor copper loss. ii. The total mechanical power developed by the rotor iii. The output power of the motor if friction and windage losses are 750W iv. The efficiency of the motor, neglecting rotor iron loss

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a) The power supplied to a three-phase induction motor is
32kW and the stator losses are 1200W. If the slip is 5% ,
determine
i. The rotor copper loss.
ii. The total mechanical power developed by the rotor
iii. The output power of the motor if friction and windage
losses are 750W
iv. The efficiency of the motor, neglecting rotor iron loss
b) The speed of the induction motor of Question 3 (a) is
reduced to 35% of its synchronous speed by using external
rotor resistance, if the torque and the stator losses are
unchanged, calculate;
i. The rotor copper loss
ii. The efficiency of the motor
Transcribed Image Text:a) The power supplied to a three-phase induction motor is 32kW and the stator losses are 1200W. If the slip is 5% , determine i. The rotor copper loss. ii. The total mechanical power developed by the rotor iii. The output power of the motor if friction and windage losses are 750W iv. The efficiency of the motor, neglecting rotor iron loss b) The speed of the induction motor of Question 3 (a) is reduced to 35% of its synchronous speed by using external rotor resistance, if the torque and the stator losses are unchanged, calculate; i. The rotor copper loss ii. The efficiency of the motor
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