Master Plumber Exam Plumbing Fixtures and Appliances 5

Question 1

A food waste disposer (garbage disposal) installed under a kitchen sink must have its drain connection made to the:

Accepted Answer

Tailpiece above the trap inlet

Answer

The disposer drain must connect to the sink tailpiece above the trap inlet so all waste passes through the trap before entering the drain system.

Question 2

Which material is prohibited for use as a lavatory drain tailpiece under most current US plumbing codes?

Accepted Answer

Lead

Answer

Lead drain components for potable-water fixtures are prohibited by current codes and the Safe Drinking Water Act due to the risk of lead leaching.

Question 3

An emergency eyewash station in a laboratory must be located within how many seconds of travel from the hazard area?

Accepted Answer

10 seconds

Answer

ANSI Z358.1 requires emergency eyewash and shower stations to be accessible within 10 seconds (approximately 55 feet) of the hazard.

Question 4

A thermostatic mixing valve differs from a pressure-balancing valve in that it:

Accepted Answer

Maintains a set outlet temperature regardless of both pressure and temperature fluctuations

Answer

Thermostatic mixing valves maintain a constant outlet temperature by compensating for both inlet pressure and temperature changes, providing more precise scald protection.

Question 5

What is the maximum flow rate in gallons per minute allowed for a lavatory faucet under the EPA WaterSense program?

Accepted Answer

1.5 gpm

Answer

EPA WaterSense-labeled lavatory faucets must have a maximum flow rate of 1.5 gpm at 60 psi, compared to the standard 2.2 gpm.

Master Plumber Exam Practice Test

Master Plumber Exam Practice Test

Master Plumber Exam Plumbing Fixtures and Appliances 5