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GATE 2022 EE – Question 24

Electrical Machines · Operating principle of single-phase induction motors · 1 mark · Multiple choice

The type of single-phase induction motor, expected to have the maximum power factor during steady state running condition, is

  1. split phase (resistance start).
  2. shaded pole.
  3. capacitor start.
  4. capacitor start, capacitor run.

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Show answer and explanation

Correct answer: (D) capacitor start, capacitor run.

Explanation

A capacitor-start capacitor-run motor keeps the capacitor in the auxiliary winding during running, which improves the power factor and gives the most balanced operation among the listed types. The others have lower running power factor.