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Journeyman Plumber Exam

Venting: practice questions

Our Journeyman Plumber bank has 19 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

What is a wet vent?

  1. A drain without a vent
  2. A vent that also carries waste from other fixtures
  3. A vent that is always kept full of water to seal it
  4. A water supply line
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B. A vent that also carries waste from other fixtures — Wet venting is common in bathroom groups.

Question 2

What is an individual (revent) vent?

  1. A vent connecting to a single fixture drain
  2. A water pipe
  3. A single vent stack serving all fixtures on a floor
  4. A drain pipe
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A. A vent connecting to a single fixture drain — It protects one trap.

Question 3 · Another state: International Plumbing Code (IPC)

Under the IPC, what is the maximum distance from a 2-inch fixture trap to its vent?

  1. 5 feet
  2. 8 feet
  3. 6 feet
  4. 12 feet
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B. 8 feet — IPC Table 909.1: 2 inches ÷ ¼ inch per foot.

Question 4 · Another state or city: Uniform Plumbing Code (UPC)

Under the UPC, what is the maximum length of a 2-inch trap arm?

  1. 6 feet
  2. 5 feet
  3. 3 feet 6 inches
  4. 8 feet
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B. 5 feet — UPC Table 1002.2 (60 inches).

Question 5 · Another state or city: Uniform Plumbing Code (UPC)

Under the UPC, what is the maximum length of a 1½-inch trap arm?

  1. 3 feet 6 inches
  2. 6 feet
  3. 2 feet 6 inches
  4. 5 feet
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A. 3 feet 6 inches — UPC Table 1002.2 (42 inches), at ¼ inch per foot.

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