semplr.

Exams · Certifications · Licensing

Journeyman Plumber Exam

Water supply: practice questions

Our Journeyman Plumber bank has 22 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

Start the free mock exam

Question 1

What is grey water?

  1. Rainwater only
  2. Sewage from toilets
  3. Lightly used water from sinks, showers and laundry, not toilets
  4. Drinking water
Show the answer

C. Lightly used water from sinks, showers and laundry, not toilets — Some codes allow grey water reuse for irrigation.

Question 2

What is the maximum lead content allowed in pipes, fittings and fixtures for drinking water (weighted average of wetted surfaces)?

  1. 8.0%
  2. 2%
  3. 8%
  4. 0.25%
Show the answer

D. 0.25% — The Reduction of Lead in Drinking Water Act took effect in 2014.

Question 3

What does 'potable water' mean?

  1. Grey water that may be reused for irrigation
  2. Water safe for drinking and cooking
  3. Sewage
  4. Rainwater
Show the answer

B. Water safe for drinking and cooking — Potable systems must be protected from contamination.

Question 4

Why are water hammer arrestors installed near quick-closing valves?

  1. To absorb pressure surges that cause banging and damage
  2. To increase the water pressure at the fixture outlet when demand is high
  3. To prevent contaminated water from flowing backwards
  4. To keep the water hot between uses at the fixture
Show the answer

A. To absorb pressure surges that cause banging and damage — Common near washing machines and dishwashers.

Question 5

Above what static pressure must a pressure-reducing valve be installed on the water service?

  1. 40 psi
  2. 60 psi
  3. 100 psi
  4. 80 psi
Show the answer

D. 80 psi — High pressure damages fixtures and wastes water; both the IPC and UPC use 80 psi.

More Journeyman Plumber topics