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Journeyman Plumber Exam

Plumbing math: 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

A water tank is 69.3 feet above a faucet. About what static pressure does it create?

  1. About 10 psi
  2. About 30 psi
  3. About 69 psi
  4. About 160 psi
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B. About 30 psi — 69.3 × 0.433 ≈ 30 psi.

Question 2

A horizontal drain 40 feet long slopes ¼ inch per foot. How much total fall is needed?

  1. 40 inches
  2. 4 inches
  3. 10 inches
  4. 1 inch
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C. 10 inches — 40 × ¼ = 10 inches.

Question 3

What is a slope of ¼ inch per foot expressed as a percentage (approx.)?

  1. About 25%
  2. About 2%
  3. About 10%
  4. About 0.25%
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B. About 2% — 0.25 ÷ 12 ≈ 0.0208.

Question 4

How much pressure does a 1-foot column of water exert?

  1. About 0.433 psi
  2. About 2.31 psi per foot
  3. About 14.7 psi
  4. About 1 psi
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A. About 0.433 psi — One psi supports about 2.31 feet of water.

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