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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Under what condition can a combination plumbing fixture be installed on one trap?

When the waste outlets are more than 30 inches apart
When the fixture is situated at the highest point in the room
When one compartment is not more than six inches deeper than the other
When the fixtures are from different rooms

The correct answer is: When one compartment is not more than six inches deeper than the other

A combination plumbing fixture can be installed on one trap when one compartment is not more than six inches deeper than the other. This requirement ensures that the drainage between the compartments functions properly and minimizes the risk of siphoning or improper drainage. If the depth difference were greater, it could lead to complications such as drainage issues or the risk of one side being overwhelmed while the other side remains under-utilized. In this context, the other conditions do not meet the necessary criteria for proper installation. For example, a distance of more than 30 inches between waste outlets may create challenges in maintaining proper drainage and could complicate venting or trap installation. Situating a fixture at the highest point in a room does not account for proper hydraulic balance and drainage flow, which is essential for proper plumbing operations. Finally, having fixtures from different rooms would require separate traps and venting systems to adhere to code and ensure proper drainage and venting, making them unsuitable for a single trap installation.