Discussion
What is the defect in a single-phase ceiling fan if it runs at lower speed for a given regulator setting?
Answer: D
A single-phase ceiling fan uses a capacitor-run induction motor, in which the capacitor gives the phase shift needed for the auxiliary winding. If the capacitor is defective or leaky, the starting and running torque falls and the fan runs slower than it should at a given regulator setting. An open in the regulator or an open in the winding would stop the fan or make it fail to run at some settings, and a non-uniform air gap would cause noise or rubbing. The answer is Defective or leaky capacitor, option (D).
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