FREE Master Plumber Fixture Installation & Repair Questions and Answers

Question 1

A master plumber is installing a new wall-hung lavatory.
Which of the following is the most critical factor to ensure proper long-term stability and prevent the fixture from pulling away from the wall?

Accepted Answer

Securely anchoring the fixture to structural blocking within the wall.

Answer

Ensuring the fixture is level and plumb during installation.

Answer

Using silicone caulk around the perimeter of the fixture.

Answer

Applying thread sealant to all water supply connections.

Question 2

When repairing a leaking faucet cartridge in a two-handle compression faucet, which component is most likely responsible for the leak if the stem packing nut is tight and the bonnet nut is not loose?

Accepted Answer

The seat washer.

Answer

The aerator.

Answer

The spout O-rings.

Answer

The handles.

Question 3

Which of the following materials is generally NOT recommended for use as a escutcheon plate sealant around a bathtub or shower valve trim due to its potential for mold growth and lack of flexibility?

Accepted Answer

Latex caulk.

Answer

100% Silicone sealant.

Answer

Plumber's putty.

Answer

Acrylic latex caulk with silicone.

Question 4

A newly installed toilet continues to run intermittently after flushing, even though the float ball is correctly set and the fill valve appears to be functioning. What is the most likely cause?

Accepted Answer

An improperly seated flapper valve.

Answer

A clogged jet hole in the toilet bowl.

Answer

Excessive water pressure to the toilet.

Answer

A faulty shut-off valve at the wall.

Question 5

When installing a garbage disposal unit, what is the primary purpose of creating a 'high loop' in the discharge hose connected to the dishwasher?

Accepted Answer

To provide an air gap, preventing wastewater from the disposal backing up into the dishwasher.

Answer

To prevent food particles from entering the dishwasher from the disposal.

Answer

To ensure proper drainage speed from the dishwasher.

Answer

To reduce noise generated by the disposal during operation.

Question 6

During the installation of a kitchen sink, the plumber notices that the tailpiece connection to the basket strainer is leaking. Which of the following is the most appropriate initial step to rectify this issue?

Accepted Answer

Ensure the rubber washer is correctly seated and the slip nut is adequately tightened at the basket strainer connection.

Answer

Tighten the slip nut connecting the tailpiece to the P-trap.

Answer

Apply more plumber's putty around the basket strainer rim.

Answer

Replace the entire basket strainer assembly.

A master plumber is installing a new wall-hung lavatory.Which of the following is the most critical factor to ensure proper long-term stability and prevent the fixture from pulling away from the wall?

A master plumber is installing a new wall-hung lavatory.
Which of the following is the most critical factor to ensure proper long-term stability and prevent the fixture from pulling away from the wall?