Preview Questions Plumber | Role Specific Skill

Question 1: Which type of leak detection method would be most effective for finding leaks in a system with inaccessible piping?

Which action should you take?

Choose only one option

Visual inspection under UV light

Acoustic emission testing

Helium tracing

Pressure testing with a portable pump

Question 2: When installing a drain-waste-vent (DWV) system, what slope is required for 4-inch pipes?

Which action should you take?

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1/2 inch per foot

1/4 inch per foot

3/4 inch per foot

1/8 inch per foot

Question 3: When performing a hydrostatic pressure test on a newly installed piping system, what is the required procedure?

Which action should you take?

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Test the system for a minimum of 24 hours

Bleed air from the pipes before testing

Ensure all fittings and joints are tight and pressurized to test level

Start testing from the farthest point

Question 4: What is the maximum allowable length for a horizontal drain pipe from a fixture to a cleanout as per the International Plumbing Code (IPC)?

Which action should you take?

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20 feet

10 feet

30 feet

5 feet

Question 5: In water supply systems, what is the best practice to prevent frozen pipes in areas with extreme cold?

Which action should you take?

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Installing pipe heating systems

Installing automatic shut-off valves

Insulating pipes and using heat trace cables

Using non-metallic pipes

Question 6: When performing an acoustic leak detection, what frequency range is typically most sensitive to small leaks?

Which action should you take?

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1000-5000 Hz

10-100 Hz

5000-10000 Hz

100-1000 Hz