Master Plumber Practice Exam

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Prepare for the Master Plumber Exam with our comprehensive quiz. Utilize multiple choice questions and flashcards with hints and explanations to enhance your understanding. Ensure success with our targeted study materials.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

The terminal end of the drain for a pressure-relief valve shall not be what?

A painted
B reamed
C threaded
D open

The correct answer is: C threaded

The terminal end of the drain for a pressure-relief valve should not be threaded. This is because a threaded end can create a trap where debris can accumulate, potentially obstructing the free flow of any discharge from the valve. Additionally, a threaded end can also introduce the risk of leaks due to the joint, which compromises the effectiveness of the relief system. Maintaining an open, unobstructed drain path ensures that the pressure-relief valve functions as intended, providing a clear route for the safe release of excess pressure. Other options, such as painted, reamed, or open, do not present the same risks regarding potential blockages or leaks at the drain terminal. In fact, keeping the drain open and clear is essential for the safety and proper operation of pressure-relief systems.