Journeyman Plumbers Exam Gas Piping and Appliances 3

Question 1

A listed gas range requires a flexible connector. What is the maximum length allowed for a residential gas appliance connector?

Accepted Answer

6 feet

Answer

ANSI Z21.24 and NFPA 54 allow gas appliance connectors up to 6 feet in length for residential ranges, dryers, and similar appliances.

Question 2

Which venting category applies to a high-efficiency gas furnace with a flue gas temperature below 140°F and a positive vent pressure?

Accepted Answer

Category IV

Answer

Category IV appliances have positive vent pressure and low flue temperatures with condensing potential, requiring special sealed plastic vent pipe (PVC or CPVC).

Question 3

Gas piping must be electrically bonded. The bond connection should be made:

Accepted Answer

To the gas piping system using a clamp upstream of any unions or isolating fittings

Answer

Bonding connects the metal gas piping to the electrical grounding system to prevent stray current and static buildup, and must be upstream of any isolating or dielectric fittings.

Question 4

What is the minimum BTU/hr input for a gas-fired water heater to require a dedicated combustion air opening?

Accepted Answer

The requirement is based on the room volume, not the BTU rating alone

Answer

Combustion air requirements are determined by the total BTU input of all appliances in the space relative to the available room volume, not a single BTU threshold.

Question 5

CSST (corrugated stainless steel tubing) installed in a structure must be bonded because:

Accepted Answer

It is susceptible to lightning-induced surge damage that can cause pinhole leaks

Answer

Lightning-induced electrical surges can arc through CSST walls creating pinhole leaks; bonding dissipates the surge current safely.

Journeyman Plumbers Exam Practice Test

Journeyman Plumbers Exam Practice Test

Journeyman Plumbers Exam Gas Piping and Appliances 3