IRC Plumbing Practice Test Exam
Questions with Correct Answers,
Double check valve assemblies must be capable of operation under _____
pressure. - CORRECT ANSWER>>continuous
P2902.3.6
Standpipes must extend a minimum of _____ inches and a maximum of
_____ inches above the trap weir. - CORRECT ANSWER>>18, 42
P2706.2
Piping in the ground must be laid on a _____ for its entire length, except
where support is otherwise provided. - CORRECT ANSWER>>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. - CORRECT ANSWER>>175
Table P2904.6.2(6)
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. - CORRECT ANSWER>>2 1/2, 3
P3005.3
When using a temperature relief valve to protect a water heater it must be
set to open at a maximum temperature of ______. - CORRECT
ANSWER>>210°F
,P2803.4
What is the water supply fixture unit value for a laundry group (clothes
washer standpipe and laundry tub) for the combined hot and cold water
branches. - CORRECT ANSWER>>2.5
Table P2903.6
Vent terminals used as a flag pole or to support flag poles, TV aerials, or
similar items, ______. - CORRECT ANSWER>>are in violation of the code
P3103.4
The vertical distance from the fixture outlet to the trap weir must not exceed
_____ inches. - CORRECT ANSWER>>24
P3201.6
The total fall in a fixture drain due to pipe slope must not exceed _____.
Exceptions ignored. - CORRECT ANSWER>>one pipe diameter
P3105.2
Plumbing fixtures that are used for washing or bathing must not be used to
receive the discharge of _____ piping. - CORRECT ANSWER>>indirect waste
P2706.3
What is the required flow rate, in gallons per minute, at a point of outlet
discharge for a water supply outlet providing water to a sillcock, hose bibb. -
CORRECT ANSWER>>5
Table P2903.1
,What is the water supply fixture unit value for a dishwasher for combined
hot and cold water branches. - CORRECT ANSWER>>1.4
Table P2903.6
The centerline of water closets or bidets must not be less than ____ inches
from adjacent walls or partitions or not less than ______ inches from its
center to any side wall, partition or vanity or closer than _____ inches center-
to-center between adjacent fixtures. - CORRECT ANSWER>>15, 30
P2705.1
All water service pipes, water distribution pipes and the necessary
connecting pipes, fittings, control valves, faucets and all appurtenances used
to dispense water intended for human ingestion must be evaluated and
listed as conforming to the requirements of _____. - CORRECT
ANSWER>>NSF 61
P2609.5
The water distribution and drainage system of any building or premises
where plumbing fixtures are installed must be connected to a public water
supply or sewer system, respectively, _____ - CORRECT ANSWER>>if
available
P2602.1
All open vent pipes which extend through a roof where the roof is to be used
for assembly, as a promenade, observation deck or sunbathing deck or for
similar purposes, the vent extensions must be run at least ______ feet above
the roof. - CORRECT ANSWER>>7
P3103.1
In a lawn irrigation system, a valve must not be installed ______ from an
atmospheric vacuum breaker. - CORRECT ANSWER>>downstream
, P2902.5.3
Horizontal vent pipes forming branch vents must be at least ______ inches
above the flood level rim of the highest fixture served. - CORRECT
ANSWER>>6
P3104.5
Backfill must be free from rocks, broken concrete and frozen chunks until the
pipe is covered by at least _____ inches of tamped earth. - CORRECT
ANSWER>>12
P2604.3
What is the maximum permitted water consumption for a water closet. -
CORRECT ANSWER>>1.6 gallons per flushing cycle
What is the minimum size of a water meter and service piping in inches for a
water supply system of 34 fixture units with a maximum developed length of
200 feet. The water pressure of the system is 35 psi. - CORRECT ANSWER>>1
Table AP201.1
What is the minimum sized trap that can be used for the drainage system of
a bathtub (with or without shower head and/or whirlpool attachments)? -
CORRECT ANSWER>>1.5
Table P3201.7
A water heater pan drain must extend full-size and terminate over a suitably
located indirect waste receptor or must extend to the exterior of the building
and terminate not less than _____ inches and not more than _____ inches
above the adjacent ground surface. - CORRECT ANSWER>>6, 24
Questions with Correct Answers,
Double check valve assemblies must be capable of operation under _____
pressure. - CORRECT ANSWER>>continuous
P2902.3.6
Standpipes must extend a minimum of _____ inches and a maximum of
_____ inches above the trap weir. - CORRECT ANSWER>>18, 42
P2706.2
Piping in the ground must be laid on a _____ for its entire length, except
where support is otherwise provided. - CORRECT ANSWER>>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. - CORRECT ANSWER>>175
Table P2904.6.2(6)
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. - CORRECT ANSWER>>2 1/2, 3
P3005.3
When using a temperature relief valve to protect a water heater it must be
set to open at a maximum temperature of ______. - CORRECT
ANSWER>>210°F
,P2803.4
What is the water supply fixture unit value for a laundry group (clothes
washer standpipe and laundry tub) for the combined hot and cold water
branches. - CORRECT ANSWER>>2.5
Table P2903.6
Vent terminals used as a flag pole or to support flag poles, TV aerials, or
similar items, ______. - CORRECT ANSWER>>are in violation of the code
P3103.4
The vertical distance from the fixture outlet to the trap weir must not exceed
_____ inches. - CORRECT ANSWER>>24
P3201.6
The total fall in a fixture drain due to pipe slope must not exceed _____.
Exceptions ignored. - CORRECT ANSWER>>one pipe diameter
P3105.2
Plumbing fixtures that are used for washing or bathing must not be used to
receive the discharge of _____ piping. - CORRECT ANSWER>>indirect waste
P2706.3
What is the required flow rate, in gallons per minute, at a point of outlet
discharge for a water supply outlet providing water to a sillcock, hose bibb. -
CORRECT ANSWER>>5
Table P2903.1
,What is the water supply fixture unit value for a dishwasher for combined
hot and cold water branches. - CORRECT ANSWER>>1.4
Table P2903.6
The centerline of water closets or bidets must not be less than ____ inches
from adjacent walls or partitions or not less than ______ inches from its
center to any side wall, partition or vanity or closer than _____ inches center-
to-center between adjacent fixtures. - CORRECT ANSWER>>15, 30
P2705.1
All water service pipes, water distribution pipes and the necessary
connecting pipes, fittings, control valves, faucets and all appurtenances used
to dispense water intended for human ingestion must be evaluated and
listed as conforming to the requirements of _____. - CORRECT
ANSWER>>NSF 61
P2609.5
The water distribution and drainage system of any building or premises
where plumbing fixtures are installed must be connected to a public water
supply or sewer system, respectively, _____ - CORRECT ANSWER>>if
available
P2602.1
All open vent pipes which extend through a roof where the roof is to be used
for assembly, as a promenade, observation deck or sunbathing deck or for
similar purposes, the vent extensions must be run at least ______ feet above
the roof. - CORRECT ANSWER>>7
P3103.1
In a lawn irrigation system, a valve must not be installed ______ from an
atmospheric vacuum breaker. - CORRECT ANSWER>>downstream
, P2902.5.3
Horizontal vent pipes forming branch vents must be at least ______ inches
above the flood level rim of the highest fixture served. - CORRECT
ANSWER>>6
P3104.5
Backfill must be free from rocks, broken concrete and frozen chunks until the
pipe is covered by at least _____ inches of tamped earth. - CORRECT
ANSWER>>12
P2604.3
What is the maximum permitted water consumption for a water closet. -
CORRECT ANSWER>>1.6 gallons per flushing cycle
What is the minimum size of a water meter and service piping in inches for a
water supply system of 34 fixture units with a maximum developed length of
200 feet. The water pressure of the system is 35 psi. - CORRECT ANSWER>>1
Table AP201.1
What is the minimum sized trap that can be used for the drainage system of
a bathtub (with or without shower head and/or whirlpool attachments)? -
CORRECT ANSWER>>1.5
Table P3201.7
A water heater pan drain must extend full-size and terminate over a suitably
located indirect waste receptor or must extend to the exterior of the building
and terminate not less than _____ inches and not more than _____ inches
above the adjacent ground surface. - CORRECT ANSWER>>6, 24
