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Journeyman Plumber Exam

Materials and joining: practice questions

Our Journeyman Plumber bank has 8 questions on this topic. Here are 4 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

What is flux used for when soldering copper?

  1. To glue plastic
  2. To seal threads
  3. To clean the metal and help solder flow into the joint
  4. To cool the joint quickly once the solder has filled the fitting
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C. To clean the metal and help solder flow into the joint — Use water-soluble, lead-free flux for drinking water.

Question 2

Which pipe material is commonly used for residential DWV systems?

  1. Galvanised steel
  2. PVC or ABS
  3. Copper Type K only
  4. PEX
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B. PVC or ABS — Cast iron is used where noise reduction or fire rating matters.

Question 3

Which joining method is used for PEX tubing?

  1. Threading with a pipe die
  2. Soldering with lead-free solder and flux
  3. Solvent cement and primer
  4. Crimp, clamp or expansion fittings
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D. Crimp, clamp or expansion fittings — PEX cannot be glued or soldered.

Question 4

Why must CSST gas piping be bonded?

  1. To improve flow
  2. To prevent leaks caused by vibration from appliances and nearby equipment
  3. To reduce the risk of damage from lightning-induced electrical arcing
  4. To increase gas pressure
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C. To reduce the risk of damage from lightning-induced electrical arcing — Follow manufacturer and code requirements.

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