Arizona plumbing exam C-37 (set 2) Questions and Answers Fully Solved Latest Update 2025-2026
What is the maximum drainer fixture units that a 4 inch trap arm can drain? - Answers 6
Trenches that are overexcavated and require backfilling below the level
of the pipe shall be backfilled in layers not exceeding: - Answers 6 inches
How many gallons of water are in 1 cubic foot? - Answers 7.5 gallons
Stell supports shall be protected against fire exposure with a fire resistance rating of at least ______
hours. - Answers 2
A combination plumbing fixture is permitted to be installed on one trap.
What is the requirement? - Answers One compartment is not more than 6 inches deeper than the other
compartments and the waste outlets are not more than 30 inches apart.
A building sewer shall have a cleanout: - Answers at intervals less than 100 feet
The international color code used by utility locators to mark an underground low voltage
communication line is. - Answers Orange
A fire sprinkler system connected to a potable water supply with a fire department connection shall be
protected against Backflow with: - Answers Double check valve or reduce pressure principle backflow
preventer
A gate valve is used for: - Answers On-off
What is the minimum number of fire sprinklers required for a 2900 sq. ft. single-story residence? -
Answers 8
How many threads may be cut on a one inch metallic pipe? - Answers 10
What would happen if you added a circulator with an expansion tank near the outlet side on a hydronic
boiler? - Answers It can cause cavitation
What is the minimum test duration for a gas supply line? - Answers 30 minutes
Gas piping (other than black or galvanized steel)run through bored holes in studs that are 7/8 of an inch
from the nearest edge shall be protected by a steel plate that extends how many inches to each side of a
stud, joist or rafter? - Answers 4 inches
The required size of the storm water drains and sewers for the roofs is
usually determined on the basis of the: - Answers effective roof area
How many laboratories required for a School that has 1100 boys in 1200 girls? - Answers 46
, Before a backhoe or grader can complete the backfill what minimum depth of clean fill is required over
the top of a sewer pipe? - Answers 12 inches
A church of 500 members, 250 which are men, shall have____
waterclosets for women. - Answers 6
Liquid level gauging devices shall be installed on containers filled by_____. - Answers Volume
A pressure regulator for a gas meter located inside of a building shall be ______. - Answers properly
vented
Thickness of aggregate material under a disposal pipe shall be a minimum of ____. - Answers 12 inches
Blue Stake uses orange to mark which of the following? - Answers Fiber optics, cable, telephone
When 140° temperature water or waste is to be discharged into a
drainage system ___. - Answers The pipes must be rated for the highest temperature
How close can a septic disposal line be to a 12 inch water main? - Answers 10 feet
What is required for materials that are used in medical gas piping systems? - Answers Delivered to job
site cleaned and capped
To ensure proper compactness around piping, trenches shall be backfilled with clean earth in 6 inch
layers to at least _____ inches above the top of the pipe; there after deeper layers are permitted. -
Answers 12
A vent pipe shall rise vertical to a point what minimum height above the
flood level rim of the fixture served before it can be offset horizontally? - Answers 6 inches
A tank that flushes more than one urinal: - Answers is prohibited
What minimum size septic tank is needed for a 5 bedroom house with
36 fixture units? - Answers 2000 gallon
What is the minimum nail plate thickness used to protect pipe in a wall? - Answers 16 gauge (0.0575)
A schedule 40 metallic pipe natural gas line supplies fuel for several
appliances which total 1530 cubic feet/hr. What size line is required by
code? Assume inlet pressure of less than 2.0 psi, maximum pressure
drop of 0.5 water column, specific gravity of 0.50, and the longest length
What is the maximum drainer fixture units that a 4 inch trap arm can drain? - Answers 6
Trenches that are overexcavated and require backfilling below the level
of the pipe shall be backfilled in layers not exceeding: - Answers 6 inches
How many gallons of water are in 1 cubic foot? - Answers 7.5 gallons
Stell supports shall be protected against fire exposure with a fire resistance rating of at least ______
hours. - Answers 2
A combination plumbing fixture is permitted to be installed on one trap.
What is the requirement? - Answers One compartment is not more than 6 inches deeper than the other
compartments and the waste outlets are not more than 30 inches apart.
A building sewer shall have a cleanout: - Answers at intervals less than 100 feet
The international color code used by utility locators to mark an underground low voltage
communication line is. - Answers Orange
A fire sprinkler system connected to a potable water supply with a fire department connection shall be
protected against Backflow with: - Answers Double check valve or reduce pressure principle backflow
preventer
A gate valve is used for: - Answers On-off
What is the minimum number of fire sprinklers required for a 2900 sq. ft. single-story residence? -
Answers 8
How many threads may be cut on a one inch metallic pipe? - Answers 10
What would happen if you added a circulator with an expansion tank near the outlet side on a hydronic
boiler? - Answers It can cause cavitation
What is the minimum test duration for a gas supply line? - Answers 30 minutes
Gas piping (other than black or galvanized steel)run through bored holes in studs that are 7/8 of an inch
from the nearest edge shall be protected by a steel plate that extends how many inches to each side of a
stud, joist or rafter? - Answers 4 inches
The required size of the storm water drains and sewers for the roofs is
usually determined on the basis of the: - Answers effective roof area
How many laboratories required for a School that has 1100 boys in 1200 girls? - Answers 46
, Before a backhoe or grader can complete the backfill what minimum depth of clean fill is required over
the top of a sewer pipe? - Answers 12 inches
A church of 500 members, 250 which are men, shall have____
waterclosets for women. - Answers 6
Liquid level gauging devices shall be installed on containers filled by_____. - Answers Volume
A pressure regulator for a gas meter located inside of a building shall be ______. - Answers properly
vented
Thickness of aggregate material under a disposal pipe shall be a minimum of ____. - Answers 12 inches
Blue Stake uses orange to mark which of the following? - Answers Fiber optics, cable, telephone
When 140° temperature water or waste is to be discharged into a
drainage system ___. - Answers The pipes must be rated for the highest temperature
How close can a septic disposal line be to a 12 inch water main? - Answers 10 feet
What is required for materials that are used in medical gas piping systems? - Answers Delivered to job
site cleaned and capped
To ensure proper compactness around piping, trenches shall be backfilled with clean earth in 6 inch
layers to at least _____ inches above the top of the pipe; there after deeper layers are permitted. -
Answers 12
A vent pipe shall rise vertical to a point what minimum height above the
flood level rim of the fixture served before it can be offset horizontally? - Answers 6 inches
A tank that flushes more than one urinal: - Answers is prohibited
What minimum size septic tank is needed for a 5 bedroom house with
36 fixture units? - Answers 2000 gallon
What is the minimum nail plate thickness used to protect pipe in a wall? - Answers 16 gauge (0.0575)
A schedule 40 metallic pipe natural gas line supplies fuel for several
appliances which total 1530 cubic feet/hr. What size line is required by
code? Assume inlet pressure of less than 2.0 psi, maximum pressure
drop of 0.5 water column, specific gravity of 0.50, and the longest length
