Marine Electrical Systems USCG Question #20 (Set 1)

What is the main function in the use of a capacitor for starting a single phase motor?

Official USCG Answer & Rule Citation

Correct Answer: Option C — Split the phase to create greater starting torque

Single-phase motors lack an inherent rotating magnetic field. A capacitor introduces a phase shift between the main and auxiliary winding currents, creating the necessary torque to initiate rotation. This phase displacement is critical for starting, as it simulates a polyphase supply to overcome the motor's static inertia.

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