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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Where should a trap not be installed according to the text?

Main drain
Indirect waste pipe
Vent stack
Sewer line

The correct answer is: Indirect waste pipe

A trap should not be installed in a vent stack because it can create a blockage that prevents the proper functioning of the venting system. Vent stacks are designed to maintain air pressure and allow gases to escape, ensuring that drainage systems function properly. Installing a trap in a vent stack would impede this process, potentially leading to a buildup of gases and offering no benefit to the drainage system. While traps are commonly used to prevent sewer gases from entering living spaces, their placement needs to be strategic. In indirect waste pipes and other drainage systems, traps play an important role. Main drains and sewer lines are also designed to flow entirely without obstruction, which traps would disrupt. Proper adherence to plumbing codes and practices dictates where traps are appropriate, ensuring both safety and functionality in the waste management system.