GATE EE 2014 Set 1 — Question 48
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Electrical Machines → Three-Phase Induction Machines → Torque-Speed & Max Torque
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Question
A 3 phase, 50 Hz, six pole induction motor has a rotor resistance of 0.1 and reactance of 0.92 . Neglect the voltage drop in stator and assume that the rotor resistance is constant. Given that the full load slip is 3%, the ratio of maximum torque to full load torque is
Correct answer
(C) 1.948
Solution
1.Rotor resistance , Rotor reactance .
2.Slip at maximum torque .
3.Full load slip .
4.The ratio of maximum torque to full load torque is given by:
5.This matches option (C).
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