PLUMBING STUDY GUIDE EXAM 2025/2026 QUESTIONS
WITH 100% CORRECT ANSWERS
Building sewers shall be tested by completely filling the sewer with water from the ______
A. Lowest to highest point
B. Lowest to at least 5' head
C. Lowest to at least 10' head
D. Lowest to at least ground level - C. Lowest to at least 10' head
Hot and cold-water piping may be tested with ____
A. 40 psi-150 psi water for 10 minutes
B. 35 psi for at least 15 minutes
C. 50 psi or the working pressure of the water in the system for at least 15 minutes
D. 100 psi of air for at least 10 minutes - C. 50 psi or the working pressure of the water in the system
for at least 15 minutes
The required clearance in front of a 3" cleanout is ____
A. 12"
B. 18"
C. 24"
D. 36" - B. 18"
A stack as defined in the code is ____
A. Main vent
B. Any vertical vent
C. The vertical main of a soil, waste, or vent piping which extends one or stories
D. Horizontal main of a soil, waste, or vent stack - C. The vertical main of a soil, waste, or vent piping
which extends one or stories
Above ground PEX piping installed horizontally shall be supported at intervals not to exceed
_________.
A. Depends on the pipe size
B. 24"
,C. 32"
D. 36" - C. 32"
The minimum vertical length for a gravity type venting system serving a fuel fired water hear is
_________.
A. 4'
B. 5'
C. 10'
D. Based on the Btu rating - B. 5'
The maximum horizontal distance of a trap arm is measure from the inner edge of the vent to the
_____
A. Weir of the trap
B. Dip of the rap
C. Inlet of the trap
D. None of the above - A. Weir of the trap
Sleeves shall be provided to protect piping ____
A. Passing through floors or concrete walls
B. Passing through concrete and masonry walls
C. Passing through wood or concrete walls
D. Passing through all locations listed above - B. Passing through concrete and masonry walls
The drain connecting the compartments of a set of fixtures to its trap is called a/an _____
A. Continuous waste
B. Combination waste and vent
C. Indirect waste
D. None of the above - A. Continuous waste
A device to prevent backflow in to the potable water system is called a _____
A. Backflow connection
B. Backflow preventer
,C. Backwater preventer
D. Both A and B - B. Backflow preventer
Copper tube and fittings used for drainage and vent piping installed above ground shall be at least
________
A. Type L
B. Type M
C. Type K
D. Type DWV - D. Type DWV
All trenches deeper than the footing of any building or structure and paralleling the same must be at
least _____
A. 45 degrees therefrom
B. 4' therefrom
C. 2' therefrom
D. 90 degrees thereform - A. 45 degree therefrom
The minimum size trap and trap arm for a kitchen sink is _______
A. 1.5 inches
B. 2 inches
C. 1 1/4 inches
D. Either A or B - A. 1.5 inches
Horizontal drainage liens connecting with other horizontal drainage lines shall enter through
__________
A. 45 degrees wye branches
B. Sanitary tee branches
C. 1/4 bend with end outlet
D. Side inlet sweep - A. 45 degrees wye branches
For each run of horizontal drain piping, the distance between cleanouts shall not exceed ____
A. 50'
, B. 75'
C. 100'
D. None of the above - C. 100'
A plumbing vent shall terminate no less than ____
A. 3' from an air intake
B. 10' from an air intake
C. 1' above the roof
D. 3' above a parapet wall - B. 10' from an air intake
Each drainage stack which extends 10 or more stores above the building drain shall be served by
_____
A. Cleanouts
B. A parallel vent stack
C. A parallel stack vent
D. Straps every 10 feet - B. A parallel vent stack
Chemical or industrial liquid wastes which are likely to damage th public sanitary sewer system shall
_______
A. Be drained into a holding tank
B. Not be used under any conditions
C. Pretreated to render them innocuous
D. Be drained into a storm drain - C. Pretreated to render them innocuous
Special venting for island fixtures is used for ______
A. Bathtubs
B. Showers
C. Kitchen sinks
D. Washing machines - C. Kitchen sinks
The vertical distance between a fixture outlet and the trap weir shall not exceed ____
A. 12"
WITH 100% CORRECT ANSWERS
Building sewers shall be tested by completely filling the sewer with water from the ______
A. Lowest to highest point
B. Lowest to at least 5' head
C. Lowest to at least 10' head
D. Lowest to at least ground level - C. Lowest to at least 10' head
Hot and cold-water piping may be tested with ____
A. 40 psi-150 psi water for 10 minutes
B. 35 psi for at least 15 minutes
C. 50 psi or the working pressure of the water in the system for at least 15 minutes
D. 100 psi of air for at least 10 minutes - C. 50 psi or the working pressure of the water in the system
for at least 15 minutes
The required clearance in front of a 3" cleanout is ____
A. 12"
B. 18"
C. 24"
D. 36" - B. 18"
A stack as defined in the code is ____
A. Main vent
B. Any vertical vent
C. The vertical main of a soil, waste, or vent piping which extends one or stories
D. Horizontal main of a soil, waste, or vent stack - C. The vertical main of a soil, waste, or vent piping
which extends one or stories
Above ground PEX piping installed horizontally shall be supported at intervals not to exceed
_________.
A. Depends on the pipe size
B. 24"
,C. 32"
D. 36" - C. 32"
The minimum vertical length for a gravity type venting system serving a fuel fired water hear is
_________.
A. 4'
B. 5'
C. 10'
D. Based on the Btu rating - B. 5'
The maximum horizontal distance of a trap arm is measure from the inner edge of the vent to the
_____
A. Weir of the trap
B. Dip of the rap
C. Inlet of the trap
D. None of the above - A. Weir of the trap
Sleeves shall be provided to protect piping ____
A. Passing through floors or concrete walls
B. Passing through concrete and masonry walls
C. Passing through wood or concrete walls
D. Passing through all locations listed above - B. Passing through concrete and masonry walls
The drain connecting the compartments of a set of fixtures to its trap is called a/an _____
A. Continuous waste
B. Combination waste and vent
C. Indirect waste
D. None of the above - A. Continuous waste
A device to prevent backflow in to the potable water system is called a _____
A. Backflow connection
B. Backflow preventer
,C. Backwater preventer
D. Both A and B - B. Backflow preventer
Copper tube and fittings used for drainage and vent piping installed above ground shall be at least
________
A. Type L
B. Type M
C. Type K
D. Type DWV - D. Type DWV
All trenches deeper than the footing of any building or structure and paralleling the same must be at
least _____
A. 45 degrees therefrom
B. 4' therefrom
C. 2' therefrom
D. 90 degrees thereform - A. 45 degree therefrom
The minimum size trap and trap arm for a kitchen sink is _______
A. 1.5 inches
B. 2 inches
C. 1 1/4 inches
D. Either A or B - A. 1.5 inches
Horizontal drainage liens connecting with other horizontal drainage lines shall enter through
__________
A. 45 degrees wye branches
B. Sanitary tee branches
C. 1/4 bend with end outlet
D. Side inlet sweep - A. 45 degrees wye branches
For each run of horizontal drain piping, the distance between cleanouts shall not exceed ____
A. 50'
, B. 75'
C. 100'
D. None of the above - C. 100'
A plumbing vent shall terminate no less than ____
A. 3' from an air intake
B. 10' from an air intake
C. 1' above the roof
D. 3' above a parapet wall - B. 10' from an air intake
Each drainage stack which extends 10 or more stores above the building drain shall be served by
_____
A. Cleanouts
B. A parallel vent stack
C. A parallel stack vent
D. Straps every 10 feet - B. A parallel vent stack
Chemical or industrial liquid wastes which are likely to damage th public sanitary sewer system shall
_______
A. Be drained into a holding tank
B. Not be used under any conditions
C. Pretreated to render them innocuous
D. Be drained into a storm drain - C. Pretreated to render them innocuous
Special venting for island fixtures is used for ______
A. Bathtubs
B. Showers
C. Kitchen sinks
D. Washing machines - C. Kitchen sinks
The vertical distance between a fixture outlet and the trap weir shall not exceed ____
A. 12"
