GATE EE 2024 Set 1 — Question 17
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Electrical Machines → Three-Phase Induction Machines → Performance Calculations
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Question
A three phase, 50 Hz, 6 pole induction motor runs at 960 rpm. The stator copper loss, core loss, and the rotational loss of the motor can be neglected. The percentage efficiency of the motor is
Correct answer
(C) 96
Solution
1.Calculate the synchronous speed ():
2.Calculate the slip ():
3.Calculate the efficiency ():
Since stator and rotational losses are neglected, the efficiency is approximately equal to the ratio of mechanical power developed to the air-gap power:Thus, the percentage efficiency is 96.
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