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Class 2 (2nd Engineer) MET 📅 Jul 2025

Exam Question

(a) List the factors that determine the starting torque of the three-phase induction motor. How does this torque generally compare with the value of the rated torque?

(b) A three-phase induction motor is wound for four poles and is supplied from a 50 Hz system. Calculate:

(i) The synchronous speed.

(ii) The speed of the rotor when the slip is 4 per cent.

(iii) The rotor frequency when the speed of the rotor is 600 r/min.

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