Why does a D.C. series motor exhibit a low power factor when supplied with A.C. power?

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

The low power factor arises primarily from the high inductance in the field and armature coils when a D.C. series motor is connected to an A.C. supply. This inductive reactance reduces the power factor significantly. Other factors, such as induced rotor currents or wire thickness, do not have as much impact.

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