TPC Single Phase Motors Practice Test 2025 - Free Motor Practice Questions and Study Guide

Question: 1 / 400

What type of starting torque does a capacitor start motor typically have?

Low starting torque

High starting torque

A capacitor start motor typically has high starting torque due to the use of a capacitor in its starting circuit. This capacitor is connected in series with the motor windings, and it shifts the phase of the current in the starting winding. This phase shift creates a significant difference between the magnetic fields generated by the start and run windings, resulting in increased torque at startup.

The high starting torque is crucial for applications requiring quick starts under load, such as in certain fan and pump applications, where the motor needs to overcome inertia to begin rotating. The design of the motor allows it to generate this high torque momentarily until it accelerates to its rated speed, after which the capacitor is disconnected, and the motor operates in a more energy-efficient manner.

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Medium starting torque

No starting torque

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