pg. 1 IRC Residential Plumbing Inspector Test 2025 With 500 Real Exam Prep Questions and Correct Answers| IRC Plumbing P1 Exam 2025 Test Bank (100% Correct Verified Answers)|| Brand New!
Horizontal drainage piping must be installed in uniform alignment at uniform slopes not less than 1/4 unit vertical in 12 unites horizontal for ______ inch diameter and less, and not less than 1/8 unit vertical in 12 unites horizontal for diameters of ______ inches or more.
2 1/2, 3
P3005.3
Individual shower and tub/shower combinations must be equipped with control valves of the pressure balance, the thermostatic mixing or the combination pressure balance-thermostatic mixing valve types with high limit stops to be set to limit water temperature to a maximum ______
120°F
P2708.3
Plumbing fixtures, other than water closets, must be provided with ______ approved strainers
P2702.1
The junction of the building drain and the building sewer must have a cleanout that is located at the junction or within _____ developed length of piping upstream of the junction.10 feet
P3005.2.3
For the air test of the DWV system, the portion under test must be maintained at a gauge pressure of _____ pounds per square inch or 10 inches of mercury column 1 / 4
pg. 2 and must be held without introduction of additional air for a period of ______ minutes.5, 15
P2503.5.1
What is the maximum fixture units of any horizontal fixture branch allowed to be connected to a 4 inch stack.160
Table P3005.4.1 What is the drainage fixture unit value (d.f.u.) for a kitchen group (dishwasher and sink with or without garbage grinder).2
Table P3004.1 Rigid support sway bracing must be provided at changes in direction greater than _____ degrees for pipe sizes _____ inches and larger.45, 4
P 2605.1
For multi-purpose piping systems, the fire sprinkler piping must ______.connect to and be a part of the cold water distribution piping system
P2904.3
Valves, pipes and fittings must be installed in correct relationship to the ______.direction of the flow
P2608.1
In a smoke test, a pungent, thick smoke is introduced into the system, when the smoke appears at vent terminals, such terminals must be sealed and a pressure 2 / 4
pg. 3 equivalent to a ______ inch water column must be applied and maintained for a test period of not less than 15 minutes.one
P2503.5.2
A drainage line with a 3 inch pipe require a minimum cleanout size of ______ inches.3
P3005.2.5
What is the maximum number of fixture units allowed to be connected to a 3 inch pipe size building drain with a slop of 1/2 inch per foot.50
Table P 3005.4.2 Piping supplying fire sprinklers must be sized using the prescriptive method in Section P2904.6.2 or by hydraulic calculation in accordance with NFPA 13D. The minimum pipe size from the water supply source to any sprinkler must be ______ nominal.3/4 inch (19mm)
P2904.6.1
Drain stacks must not be smaller than ______. Exceptions ignored.the largest horizontal branch connected
P3005.4.1
The water supply to a dishwasher must be protected against backflow by a(n) _____ air gap
P2717.1 3 / 4
pg. 4 A plumbing or drainage system, or part thereof, must not be covered, concealed or put into use until it has been _____ by the building official.
- tested; and
- inspected; and
- approved
- feet (915 mm)
Pendent fire sprinklers within _____ of the center of a ceiling fan, surface-mounted ceiling luminaire or similar object must be considered to be obstructed, and additional sprinklers must be installed.
P2904.2.4.2.1
Double check valve assemblies must be capable of operation under _____ pressure.continuous
P2902.3.6
Standpipes must extend a minimum of _____ inches and a maximum of _____ inches above the trap weir.
18, 42
P2706.2
Piping in the ground must be laid on a _____ for its entire length, except where support is otherwise provided.firm bed
P2605.1
A fire sprinkler system is required to have a flow rate of 21 gallons per minute (gpm). The CPVC water distribution pipe size is 3/4" with an available pressure of 45 PSI. What is the maximum allowable length of the pipe from the service valve to the farthest sprinkler in feet.
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