Journeyman Plumbers Exam Gas Piping and Venting 5

Question 1

A gas appliance vent connector should slope upward toward the vent at a minimum of:

Accepted Answer

1/4 inch per foot

Answer

Vent connectors must rise at least 1/4 inch per foot toward the vent to ensure proper draft and prevent condensate from collecting in low spots.

Question 2

Propane (LP gas) differs from natural gas in that it:

Accepted Answer

Is heavier than air and tends to settle in low areas

Answer

Propane has a specific gravity greater than 1.0, so it sinks and accumulates in basements, pits, and low spots — creating a greater explosion risk than natural gas.

Question 3

When multiple gas appliances share a common vent, the common vent must be sized to handle:

Accepted Answer

The total combined BTU input of all connected appliances

Answer

A common vent must be sized for the total combined BTU input of all appliances that connect to it at any time.

Question 4

What is the maximum length of an unprotected flexible appliance connector used on a gas range?

Accepted Answer

6 feet

Answer

Flexible connectors must not exceed 6 feet and must be the listed connector type appropriate for the appliance.

Question 5

A gas piping system installed in a commercial kitchen must be tested at what minimum pressure after installation?

Accepted Answer

3 psig for at least 10 minutes

Answer

Commercial gas piping systems are commonly required to hold a test pressure of at least 3 psig for a minimum of 10 minutes with no detectable pressure drop.

Journeyman Plumbers Exam Practice Test

Journeyman Plumbers Exam Practice Test

Journeyman Plumbers Exam Gas Piping and Venting 5