Master Plumber Exam Plumbing Fixtures and Appliances 4

Question 1

Under the International Plumbing Code, what is the minimum clearance from the centerline of a water closet to a side wall or obstruction?

Accepted Answer

15 inches

Answer

The IPC requires a minimum 15-inch clearance from the water closet centerline to any side wall or obstruction.

Question 2

A tankless (on-demand) water heater differs from a storage water heater primarily because it:

Accepted Answer

Heats water only as it flows through the unit with no storage tank

Answer

Tankless water heaters heat water on demand as it flows through a heat exchanger, eliminating standby heat loss associated with storage tanks.

Question 3

A relief valve on a water heater must be set to open at or below which temperature?

Accepted Answer

180°F

Answer

Temperature and pressure relief (TPR) valves on water heaters must be set to open at or below 210°F (some codes say 200°F) to prevent dangerous steam buildup.

Question 4

What fitting is NOT permitted for use as the sole trap for a bathtub under most US plumbing codes?

Accepted Answer

S-trap

Answer

S-traps are prohibited because they tend to self-siphon due to the downward flow geometry, destroying the water seal.

Question 5

A solar water heating system's backup electric element is classified under plumbing codes as a:

Accepted Answer

Pressure vessel subject to TPR valve requirements

Answer

Solar water heater storage tanks are pressure vessels and must be equipped with temperature and pressure relief valves per plumbing code.

Master Plumber Exam Practice Test

Master Plumber Exam Practice Test

Master Plumber Exam Plumbing Fixtures and Appliances 4