Minnesota Boiler License Practice Exam

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What should a boiler operator do if a float type of low water cutoff hangs up?

Replace the float.
Replace the Mercury switch.
Check the float chamber for mud or sediment.
Adjust the float.

The correct answer is: Check the float chamber for mud or sediment.

When a float type low water cutoff hangs up, the appropriate action is to check the float chamber for mud or sediment. This is important because contaminants can interfere with the proper operation of the float mechanism. If there is mud or sediment build-up, it can cause the float to become stuck, leading to incorrect readings of water levels within the boiler. By addressing any obstructions in the float chamber, the operator ensures that the device can accurately monitor water levels, which is crucial for safe boiler operation. In the case of other options, replacing the float or the Mercury switch may not address the immediate issue if the problem is merely a blockage due to sludge or sediment. Similarly, adjusting the float can lead to improper functioning if the underlying issue is not resolved. Therefore, inspecting the float chamber first is a logical step that could restore proper function without unnecessary part replacements.