Massachusetts Plumbers Journeyman Practice Exam

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Study for the Massachusetts Plumbers Journeyman Exam. Prepare with multiple choice questions, hints, and detailed explanations. Ace your licensing exam with confidence!

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What is the purpose of an automatic trap-priming device for floor/trough drains?

To increase water flow
To save energy
To prevent backflow
To maintain water seal

The correct answer is: To maintain water seal

An automatic trap-priming device for floor/trough drains serves the purpose of maintaining the water seal in the trap. The water seal in a trap prevents sewer gases from entering the building, acting as a barrier between the plumbing system and the indoor environment. By automatically adding water to the trap when needed, the device ensures that the seal remains intact, thus protecting the occupants from potentially harmful sewer gases.