GATE EE 2016 Set 2 — Question 32

MCQ+1 / -0.33EasyStarting MethodsSingle-Phase Induction MotorsElectrical Machines

Electrical Machines → Single-Phase Induction Motors → Starting Methods

Last updated 5 September 2026

Question

The direction of rotation of a single-phase capacitor run induction motor is reversed by

Correct answer (C) interchanging the terminals of the auxiliary winding. Solution In a single-phase capacitor run induction motor, the direction of rotation depends on the phase relationship between the currents in the main and auxiliary windings. To reverse the direction of rotation, the phase of one winding's current must be reversed relative to the other. This is achieved by interchanging the terminals of either the main winding or the auxiliary winding. Interchanging the supply terminals (Option A) or both windings (Option D) reverses both currents, maintaining the same relative phase and thus the same direction of rotation. Interchanging capacitor terminals (Option B) does not change the phase shift direction. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (C) interchanging the terminals of the auxiliary winding. Solution In a single-phase capacitor run induction motor, the direction of rotation depends on the phase relationship between the currents in the main and auxiliary windings. To reverse the direction of rotation, the phase of one winding's current must be reversed relative to the other. This is achieved by interchanging the terminals of either the main winding or the auxiliary winding. Interchanging the supply terminals (Option A) or both windings (Option D) reverses both currents, maintaining the same relative phase and thus the same direction of rotation. Interchanging capacitor terminals (Option B) does not change the phase shift direction.

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