Arkansas Boiler Operator Practice Exam

What is a low-water cut-off device used for in a boiler?

1. To cut fuel when the water level is too high

2. To cut fuel to the boiler when the water level falls below a safe level

3. To maintain a consistent pressure

4. To cool the boiler down

The correct answer is: To cut fuel to the boiler when the water level falls below a safe level

A low-water cut-off device is essential for boiler safety. It is specifically designed to monitor the water level within the boiler. When the water level drops below a designated safe threshold, the device activates to shut off the fuel supply to the boiler. This action prevents potential damage that could occur from a lack of water, such as overheating or the risk of a boiler explosion. Maintaining a safe water level is critical, as water serves as a coolant and steam generation medium. If the water level is too low, it can expose the boiler's heating surfaces, leading to serious operational hazards. The device acts as a crucial safety feature, ensuring that the boiler functions within safe parameters. Other options, while related to boiler operation, do not address the specific role of the low-water cut-off device.