Preview Questions Plumber | Role Specific Skill

Question 1: How can a plumber verify the integrity of a newly installed gas line using electronic leak detectors?

Which action should you take?

Choose only one option

By measuring the pressure differential across joints

By observing gas emissions at pipe connections

By testing for a flow of gas without sealing pipe ends

By listening for changes in sound frequency

Question 2: According to the National Plumbing Code, what is the maximum allowable length for a trap arm before a vent is required?

Which action should you take?

Choose only one option

5 feet

10 feet

8 feet

6 feet

Question 3: According to the National Plumbing Code (NPC), which of the following materials is not approved for use in drinking water pipes in commercial buildings?

Which action should you take?

Choose only one option

CPVC

PVC

PEX

Galvanized Steel

Question 4: When using a pressure test to detect leaks in PEX piping, which of the following factors must be carefully controlled?

Which action should you take?

Choose only one option

Water temperature

Pressure hold time

Pipe exposure to sunlight

PEX type and fitting material

Question 5: Under the UPC, which of the following is the minimum required clearance for vent pipes passing through a roof to prevent water accumulation and blockages?

Which action should you take?

Choose only one option

6 inches

12 inches

18 inches

3 inches

Question 6: Which of the following is a key consideration when maintaining fire suppression systems in commercial buildings?

Which action should you take?

Choose only one option

Ensuring that all valves are locked in the open position

Checking for contamination in water supply

Cleaning all sprinkler heads bi-annually

Verifying the water flow rate and pressure regularly