Question

The electrolytic capacitor used in a capacitor start motor is a short duty type and guaranteed for operations per hour.

• A. 10
• B. 15
• C. 20
• D. 25

Hint:

Short duty electrolytic capacitors in capacitor start motors are rated for limited start operations (usually around 20 per hour) to avoid damage.

Answer 1

The Correct Option is C

Capacitor start motors utilize an electrolytic capacitor to achieve high starting torque. This is accomplished by generating a phase shift between the currents flowing through the main and auxiliary windings. Crucially, these capacitors are designed for intermittent, short-duration use only during motor startup. Their operational limit is approximately 20 cycles per hour to mitigate overheating and prevent performance degradation. Exceeding this frequency of operation can result in capacitor failure and a shortened motor lifespan.