What consequence occurs if the centrifugal switch fails to open when the motor reaches 70 to 80 percent of its synchronous speed?

Single Phase Induction Motors MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Single Phase Induction Motorselectrical-engineering-mcqs › single-phase-induction-motors
Published
3 Oct 2018
Last updated
28 May 2026

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Explanation

If the centrifugal switch does not disengage at 70 to 80 percent of the motor's synchronous speed, the starting winding remains energized, which can cause damage to it. This prevents the motor from operating safely and efficiently.

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