Master Plumber Plumbing Fixtures and Appliances Questions and Answers

Question 1

A plumber is installing a dishwasher in a residence.
To prevent the backflow of contaminated water from the sink drain into the dishwasher, which of the following is the most effective and commonly code-required method?

Accepted Answer

An air gap fitting mounted on the countertop or sink deck.

Answer

A high loop in the drain hose secured to the underside of the countertop.

Answer

A check valve installed in the dishwasher's drain line.

Answer

Connecting the drain hose to the garbage disposal below the sink's flood level rim.

Question 2

According to the Americans with Disabilities Act (ADA) standards, what is the maximum height from the finished floor to the rim of a compliant lavatory or sink?

Accepted Answer

34 inches

Answer

30 inches

Answer

36 inches

Answer

40 inches

Question 3

In a commercial kitchen, which of the following fixtures typically requires an indirect waste connection to the drainage system to ensure food safety?

Accepted Answer

Food preparation sink

Answer

Employee handwashing sink

Answer

Floor drain in the main walkway

Answer

Mop sink

Question 4

A trap seal primer conforming to ASSE 1018 or ASSE 1044 is most commonly required for which of the following fixtures?

Accepted Answer

An emergency floor drain in a mechanical room.

Answer

A residential bathtub that is used daily.

Answer

A water closet in a high-traffic public restroom.

Answer

A kitchen sink with a garbage disposal.

Question 5

To minimize the risk of scalding, most plumbing codes mandate that the hot water supplied to bathtubs and showers in residential and commercial settings be limited to a maximum temperature of:

Accepted Answer

120°F (49°C)

Answer

110°F (43°C)

Answer

140°F (60°C)

Answer

130°F (54°C)

Question 6

In a public restroom, an elongated bowl is required for a water closet. What is the primary reason for this code requirement?

Accepted Answer

It provides better hygiene and is easier for a wider range of individuals to use.

Answer

It uses less water per flush than a round-front bowl.

Answer

It is less expensive to manufacture and install.

Answer

It is structurally stronger and less prone to cracking.

A plumber is installing a dishwasher in a residence.To prevent the backflow of contaminated water from the sink drain into the dishwasher, which of the following is the most effective and commonly code-required method?

A plumber is installing a dishwasher in a residence.
To prevent the backflow of contaminated water from the sink drain into the dishwasher, which of the following is the most effective and commonly code-required method?