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Journeyman Plumber Exam

Fuel gas: practice questions

Our Journeyman Plumber bank has 11 questions on this topic. Here are 3 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

What should be used to test gas piping for leaks at joints?

  1. An approved leak detection solution or gas detector, never a flame
  2. Smell only
  3. A match
  4. A lighter
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A. An approved leak detection solution or gas detector, never a flame — Open flames can cause explosions.

Question 2

What should you do if you smell a strong gas leak inside a building?

  1. Leave the building, avoid switches or flames, and call the gas utility from a safe place
  2. Turn on lights to look
  3. Light a match to find it
  4. Stay and open windows only
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A. Leave the building, avoid switches or flames, and call the gas utility from a safe place — Sparks can ignite gas.

Question 3

How is gas piping usually pressure tested for leaks?

  1. With water
  2. With oxygen
  3. With air or inert gas at the code test pressure for the required time, never with oxygen
  4. With natural gas at full pressure
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C. With air or inert gas at the code test pressure for the required time, never with oxygen — Test pressure is usually at least 1.5 times working pressure, not less than 3 psig.

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