Ontario Operator-in-Training (OIT) Practice Exam

What phenomenon might an operator experience if there is cavitation in the pump?

1. A decrease in pressure

2. Noticeable vibration and hammering noise

3. Overheating

4. Increased efficiency

The correct answer is: Noticeable vibration and hammering noise

Cavitation in a pump occurs when the pressure within the pump falls below the vapor pressure of the liquid, resulting in the formation of vapor bubbles. As the pump continues to function, these bubbles can collapse violently when they enter a region of higher pressure, leading to a series of rapid pressure changes. This collapse creates noticeable vibration and a hammering noise, which is often referred to as "cavitation noise." The presence of these vibrations and noises is a key indicator that cavitation is occurring and can significantly affect the performance and longevity of the pump. It is important for operators to recognize these symptoms to prevent potential damage to the pump and ensure efficient operation.