RESIDENTIAL PLUMBING EXAM
QUESTIONS WITH ALL CORRECT
ANSWERS
The discharge pipe on a sump pump should have a _________ installed to prevent
previously pumped discharge from returning to the pump.
float-ball valve
wye fitting
check valve
drain hole - Answer-check valve
Venting protects the trap seals from positive pressures and _____.
staying filled with water
leaking
siphonage
clogged drains - Answer-siphonage
A plumbing DWV vent termination should be at least 10 feet horizontally away from
such a door or window, unless it is at least _____ above the top of the opening.
3 feet
way
48 inches
5 feet - Answer-3 feet
The vent pipe that passes through a roof should end at least ____ inches above a roof.
6
36
12
3 - Answer-6
Every trap and trap fixture should be _____.
void of water
capped
replaced
stopped
vented - Answer-vented
There should be at least ____ vent pipe(s) that extend(s) to the outdoor air for a
dwelling.
one
four
, two
six - Answer-two
The vent pipe that passes through the roof should end at least _____ above it to protect
the end of the vent pipe from being blocked by snow, and to allow a sufficient length of
pipe for proper roof flashing.
6 inches
16 inches
10 inches
2 meters - Answer-6 inches
The _____ is the lowest pipe of a drainage system into which drains the soil, waste and
other drainage pipes from inside, and it extends at least 30 inches beyond the exterior
building walls.
stack vent
sewer drain
building drain
water trap
main vent stack - Answer-sewer drain
The minimum size of any vent is half of the required size of the drain pipe, but not less
than - Answer-1 1/4 inches
Standpipes, like that for a clothes washer, should have a minimum height above the
trap of ________.
2 feet
4 inches
4 feet
18 inches - Answer-18 inches
A cleanout plug or removable trap section _____ installed on traps located below
laundry tubs, sinks and washbasins used for cleaning.
should not be
should be - Answer-should be
Toilets _____ have traps.
shall
should
never - Answer-never
______ traps are not permitted.
S-
Cleanout
T-
Bubble - Answer-S
QUESTIONS WITH ALL CORRECT
ANSWERS
The discharge pipe on a sump pump should have a _________ installed to prevent
previously pumped discharge from returning to the pump.
float-ball valve
wye fitting
check valve
drain hole - Answer-check valve
Venting protects the trap seals from positive pressures and _____.
staying filled with water
leaking
siphonage
clogged drains - Answer-siphonage
A plumbing DWV vent termination should be at least 10 feet horizontally away from
such a door or window, unless it is at least _____ above the top of the opening.
3 feet
way
48 inches
5 feet - Answer-3 feet
The vent pipe that passes through a roof should end at least ____ inches above a roof.
6
36
12
3 - Answer-6
Every trap and trap fixture should be _____.
void of water
capped
replaced
stopped
vented - Answer-vented
There should be at least ____ vent pipe(s) that extend(s) to the outdoor air for a
dwelling.
one
four
, two
six - Answer-two
The vent pipe that passes through the roof should end at least _____ above it to protect
the end of the vent pipe from being blocked by snow, and to allow a sufficient length of
pipe for proper roof flashing.
6 inches
16 inches
10 inches
2 meters - Answer-6 inches
The _____ is the lowest pipe of a drainage system into which drains the soil, waste and
other drainage pipes from inside, and it extends at least 30 inches beyond the exterior
building walls.
stack vent
sewer drain
building drain
water trap
main vent stack - Answer-sewer drain
The minimum size of any vent is half of the required size of the drain pipe, but not less
than - Answer-1 1/4 inches
Standpipes, like that for a clothes washer, should have a minimum height above the
trap of ________.
2 feet
4 inches
4 feet
18 inches - Answer-18 inches
A cleanout plug or removable trap section _____ installed on traps located below
laundry tubs, sinks and washbasins used for cleaning.
should not be
should be - Answer-should be
Toilets _____ have traps.
shall
should
never - Answer-never
______ traps are not permitted.
S-
Cleanout
T-
Bubble - Answer-S
