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Journeyman Plumber Exam

Troubleshooting: practice questions

Our Journeyman Plumber bank has 13 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

A toilet runs constantly. What is a likely cause?

  1. A clogged vent
  2. A cracked bowl
  3. A worn flapper or misadjusted fill valve
  4. Low water pressure in the supply line only
Show the answer

C. A worn flapper or misadjusted fill valve — Check the flapper seal and float height.

Question 2

A T&P relief valve on a water heater keeps dripping. What could be the cause?

  1. Excess pressure from thermal expansion, high temperature, or a faulty valve
  2. A broken toilet
  3. Low water pressure
  4. A clogged drain
Show the answer

A. Excess pressure from thermal expansion, high temperature, or a faulty valve — Check for an expansion tank and PRV issues.

Question 3

What causes frozen pipes to burst?

  1. Air enters the pipe
  2. Too much heat
  3. Water expands as it freezes, creating high pressure
  4. Water shrinks when freezing, which pulls the joints apart
Show the answer

C. Water expands as it freezes, creating high pressure — Insulate pipes in unheated spaces.

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