Question 1
What is a cross-connection in a plumbing system?
Correct Answer:
Any physical link between a potable water supply and a potentially contaminated source
Question 2
What type of backflow occurs when negative pressure develops in a supply line and draws contaminants backward?
Correct Answer:
Backsiphonage
Question 3
Which backflow prevention method provides protection solely through physical separation with no mechanical parts?
Correct Answer:
Air gap
Question 4
What is the minimum air gap required between a water supply outlet and the flood level rim of a receiving fixture under most plumbing codes?
Correct Answer:
Twice the effective opening of the supply outlet, but not less than 1 inch
Question 5
Which backflow prevention assembly is specifically required for high-hazard cross-connections to a public water supply?
Correct Answer:
Reduced pressure zone (RPZ) assembly
Question 1
Exam overview

About this Exam

Prepare with the NBOPE Journeyman Plumber Certification Exam practice quiz. This question bank includes 30 questions covering plumber, blueprint, reading, interpretation, and safety. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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NBOPE Journeyman Plumber Certification Exam

This practice set contains 30 questions from the matching question bank and focuses on plumber, blueprint, reading, interpretation, and safety. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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