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Journeyman Plumber Exam

Fixtures: practice questions

Our Journeyman Plumber bank has 15 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 the purpose of a fixture's overflow?

  1. To vent the drain
  2. To prevent water from spilling over the rim if the drain is closed
  3. To add water
  4. To increase flow
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B. To prevent water from spilling over the rim if the drain is closed — Overflows connect to the waste on the inlet side of the trap.

Question 2

What water flow rate is the federal maximum for new residential lavatory faucets?

  1. 4 gpm
  2. 2.2 gallons per minute at 60 psi
  3. 5 gpm
  4. 0.5 gallons per minute at 20 psi
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B. 2.2 gallons per minute at 60 psi — WaterSense faucets use 1.5 gpm or less.

Question 3

What is a floor drain's trap protected from drying out by?

  1. A trap primer or regular use
  2. A water hammer arrestor on the line
  3. A cap
  4. A vent only
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A. A trap primer or regular use — Dry traps let sewer gas in.

Question 4

What is the purpose of the overflow on a lavatory?

  1. To vent the trap so the water seal is protected
  2. To supply extra water to the faucet when needed
  3. To increase the speed at which the lavatory drains when the stopper is open
  4. To prevent water from spilling over the rim if the drain is closed
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D. To prevent water from spilling over the rim if the drain is closed — The overflow connects to the drain above the trap.

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