Free Illinois plumbing practice test with 20 questions on water supply, DWV systems, plumbing code principles, and IDPH plumber licensing. Instant scoring.
These questions are for study practice only and are not official exam questions.
Question 1
1
How many years must an applicant work as an Illinois-licensed Apprentice Plumber before sitting for the Plumber's License exam?
Question 2
2
What is the entry-level plumbing license in Illinois called?
Question 3
3
What is the primary purpose of an air gap in a plumbing water supply system?
Question 4
4
By what date each year must an Illinois Plumber's License be renewed?
Question 5
5
What is the purpose of a P-trap installed beneath a plumbing fixture?
Question 6
6
A City of Chicago-licensed plumber who completed a 4-year licensed apprenticeship wants an Illinois state plumbing license. What is available to this plumber?
Question 7
7
Which pipe material is commonly prohibited for new potable water supply piping due to lead content concerns in older installations?
Question 8
8
A building's static water pressure is measured at 95 psi at the street connection. What is the most likely code-required response?
Question 9
9
Which Illinois state agency licenses plumbers under the Illinois Plumbing License Law?
Question 10
10
Which Illinois credential is separate from the general Plumber's License and involves its own examination application?
Question 11
11
What is the primary purpose of a plumbing vent system?
Question 12
12
A licensed plumber performs plumbing work for another person in Illinois. What must this plumber also obtain annually?
Question 13
13
What is the main function of a water hammer arrestor installed near quick-closing valves?
Question 14
14
Why must drain, waste, and vent (DWV) piping be sloped correctly along its horizontal runs?
Question 15
15
What is the primary purpose of a backflow preventer on a lawn irrigation system connected to the potable water supply?
Question 16
16
What is the function of a cleanout installed in a drainage line?
Question 17
17
Which document governs the technical installation requirements plumbers must follow in Illinois?
Question 18
18
Why are dielectric unions commonly required where copper and galvanized steel piping connect?
Question 19
19
An Illinois Irrigation Contractor registration is issued by which agency, alongside the standard Plumbing Contractor registration?
Question 20
20
A fixture trap arm is installed with excessive horizontal distance from the fixture to its vent connection, beyond code limits. What problem is most likely to result?
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