Water Distribution Grade 1 Certification Practice Exam

What does a Bellows-type sensor react to a change in?

1. Temperature

2. Electricity

3. Pressure

4. Fluid flow

The correct answer is: Pressure

A Bellows-type sensor is specifically designed to react to changes in pressure. This sensor uses a flexible bellows component that expands or contracts in response to variations in the pressure of the fluid it is monitoring. When the pressure increases, the bellows is compressed; conversely, when the pressure decreases, the bellows expands. This movement can then be translated into a measurable output, which makes it a valuable tool for monitoring and controlling pressure in water distribution systems. While other options such as temperature, electricity, or fluid flow are critical parameters in many contexts of engineering and water distribution, a Bellows-type sensor is not designed to measure those attributes directly. Sensors for temperature would utilize thermocouples or thermistors, whereas fluid flow might be measured with flow meters, and electrical properties would involve different sensing technologies altogether. Thus, recognizing that the primary function of a Bellows-type sensor focuses on pressure helps clarify its intended application and the operational mechanics involved.