Illinois State Plumbing {Systems Testing,
Installation, and Fixture Requirement 1}
2026-2027 Comprehensive Frequently Tested
Questions With Verified Multiple Choice and
Conceptual Actual 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
1. Testing of a building sewer shall be conducted using a minimum head of water
of:
A. 5 feet for 10 minutes
B. 8 feet for 10 minutes
C. 10 feet for 15 minutes
D. 12 feet for 30 minutes
Correct Answer: C
2. When tested by air, a DWV system shall be tested at:
A. 3 PSI for 10 minutes
B. 5 PSI or 10 inches of mercury for 15 minutes
C. 7 PSI for 30 minutes
D. 10 PSI for 5 minutes
Correct Answer: B
,3. When a smoke test is used to verify gas tightness of a DWV system, the
applied pressure shall be equivalent to:
A. ½-inch water column for 10 minutes
B. 1-inch water column for 15 minutes
C. 2-inch water column for 10 minutes
D. 3-inch water column for 30 minutes
Correct Answer: B
4. When an air test of rough plumbing requires a test pressure of 5 PSI, the test
gauge shall be calibrated in increments of:
A. 0.25 PSI
B. 0.20 PSI
C. 0.10 PSI
D. 0.05 PSI
Correct Answer: C
5. Trenches excavated parallel to a footing shall not extend more than:
A. 12 inches below the footing
B. 18 inches below the footing
C. The bearing plane at a 45-degree angle
D. The depth of the footing
Correct Answer: C
6. A water supply system shall be proven tight under water pressure not less
than the working pressure of the system or by an air test of at least:
A. 25 PSI
B. 40 PSI
, C. 50 PSI
D. 75 PSI
Correct Answer: C
7. Copper piping passing through bored holes in wood studs shall be protected
by shield plates unless the hole is at least:
A. 1 inch from the edge
B. 1¼ inches from the edge
C. 1½ inches from the edge
D. 2 inches from the edge
Correct Answer: C
8. Required shield plates protecting piping through framing members shall
extend at least:
A. 1 inch above and below plates
B. 1½ inches above and below plates
C. 2 inches above sole plates and below top plates
D. 3 inches above and below plates
Correct Answer: C
9. A building drain passing through a foundation wall without a relieving arch
shall pass through a sleeve sized:
A. One pipe size larger
B. Two pipe sizes larger
C. Three pipe sizes larger
D. Equal to the pipe size
Correct Answer: B
Installation, and Fixture Requirement 1}
2026-2027 Comprehensive Frequently Tested
Questions With Verified Multiple Choice and
Conceptual Actual 100% Correct Detailed Answers
Guaranteed Pass!!Current Update!!
1. Testing of a building sewer shall be conducted using a minimum head of water
of:
A. 5 feet for 10 minutes
B. 8 feet for 10 minutes
C. 10 feet for 15 minutes
D. 12 feet for 30 minutes
Correct Answer: C
2. When tested by air, a DWV system shall be tested at:
A. 3 PSI for 10 minutes
B. 5 PSI or 10 inches of mercury for 15 minutes
C. 7 PSI for 30 minutes
D. 10 PSI for 5 minutes
Correct Answer: B
,3. When a smoke test is used to verify gas tightness of a DWV system, the
applied pressure shall be equivalent to:
A. ½-inch water column for 10 minutes
B. 1-inch water column for 15 minutes
C. 2-inch water column for 10 minutes
D. 3-inch water column for 30 minutes
Correct Answer: B
4. When an air test of rough plumbing requires a test pressure of 5 PSI, the test
gauge shall be calibrated in increments of:
A. 0.25 PSI
B. 0.20 PSI
C. 0.10 PSI
D. 0.05 PSI
Correct Answer: C
5. Trenches excavated parallel to a footing shall not extend more than:
A. 12 inches below the footing
B. 18 inches below the footing
C. The bearing plane at a 45-degree angle
D. The depth of the footing
Correct Answer: C
6. A water supply system shall be proven tight under water pressure not less
than the working pressure of the system or by an air test of at least:
A. 25 PSI
B. 40 PSI
, C. 50 PSI
D. 75 PSI
Correct Answer: C
7. Copper piping passing through bored holes in wood studs shall be protected
by shield plates unless the hole is at least:
A. 1 inch from the edge
B. 1¼ inches from the edge
C. 1½ inches from the edge
D. 2 inches from the edge
Correct Answer: C
8. Required shield plates protecting piping through framing members shall
extend at least:
A. 1 inch above and below plates
B. 1½ inches above and below plates
C. 2 inches above sole plates and below top plates
D. 3 inches above and below plates
Correct Answer: C
9. A building drain passing through a foundation wall without a relieving arch
shall pass through a sleeve sized:
A. One pipe size larger
B. Two pipe sizes larger
C. Three pipe sizes larger
D. Equal to the pipe size
Correct Answer: B
