Master Plumber Exam Plumbing Codes and Regulations 5

Question 1

Under the IPC, which backflow prevention device provides the highest level of protection for a high-hazard cross-connection?

Accepted Answer

Reduced pressure zone (RPZ) assembly

Answer

An RPZ assembly is required for high-hazard connections because it protects against both back-siphonage and back-pressure through a monitored relief port.

Question 2

According to the IPC, potable water supply piping must be separated from drain, waste, and vent piping by at least:

Accepted Answer

No specific separation is required as long as there is no cross-connection

Answer

The IPC does not require a specific physical separation distance; it prohibits cross-connections between potable and non-potable systems.

Question 3

A master plumber is sizing a grease interceptor for a restaurant with two 3-compartment sinks. Which standard governs grease interceptor sizing?

Accepted Answer

PDI G-101

Answer

PDI G-101 (Plumbing & Drainage Institute) provides the standard sizing method for grease interceptors based on flow rate and retention time.

Question 4

Under model plumbing codes, an approved water heater pressure relief valve must be set to open at or below:

Accepted Answer

150 psi

Answer

Plumbing codes and ASME standards require T&P relief valves on water heaters to open at no more than 150 psi.

Question 5

Per the IPC, what is the minimum diameter of a stack vent or vent stack that serves a building drain handling more than 100 fixture units?

Accepted Answer

4 inches

Answer

IPC vent sizing tables require a minimum 4-inch vent stack when the connected drainage system exceeds 100 DFU.

Master Plumber Exam Practice Test

Master Plumber Exam Practice Test

Master Plumber Exam Plumbing Codes and Regulations 5