Journeyman Plumbers Exam General Plumbing Regulations 5

Question 1

Under IPC, which of the following venting methods allows a single vent pipe to serve multiple fixtures on the same horizontal branch?

Accepted Answer

Circuit venting

Answer

Circuit venting allows a single vent to serve multiple fixtures connected to a common horizontal drain branch.

Question 2

What is the primary reason galvanized steel pipe is rarely used for new potable water installations today?

Accepted Answer

It corrodes internally, restricting flow and introducing rust into water over time

Answer

Galvanized steel pipe corrodes from the inside out over time, reducing diameter and introducing rust and scale into the water supply.

Question 3

Under IPC, what is required when a plumbing vent pipe passes through a roof?

Accepted Answer

It must extend at least 6 inches above the roof surface

Answer

The IPC requires vent pipes to extend at least 6 inches above the roof to prevent blockage by snow or debris.

Question 4

A plumber finds that an existing 4-inch cast iron drain is cracked and must be replaced with PVC. The transition coupling used between cast iron and PVC must be:

Accepted Answer

A listed mechanical (Fernco-type) transition coupling

Answer

A listed mechanical transition (shielded) coupling is required to join dissimilar pipe materials like cast iron and PVC.

Question 5

Which of the following is the correct definition of 'drainage fixture units' (DFU)?

Accepted Answer

A unit of measure used to calculate the probable discharge load on a drainage system

Answer

Drainage fixture units (DFU) are a standardized unit used to estimate the probable drainage load that fixtures impose on a sanitary drainage system.

Journeyman Plumbers Exam Practice Test

Journeyman Plumbers Exam Practice Test

Journeyman Plumbers Exam General Plumbing Regulations 5