Arizona Plumbing Exam C-37 (set 4) Questions and Answers Solved Correctly Latest Update 2025-2026
What is the name for the measurement taken along the center line of a pipe and fittings? - Answers
Developed Length
What is the minimum water seal depth on a sand interceptor? - Answers 6 inches
What is the minimum diameter of a sump pit being installed in the basement? - Answers 18 inches
When installing a pipe that can carry a maximum of 7000 DFU at a slope of 1/16 in per ft, what is the
minimum pipe size? - Answers 15 inch diameter
How many roof drains are required for a building 300 feet by 50 feet? - Answers 4
What may be added as anti-freeze when fire sprinklers are connected to potable water? - Answers
Glycerine
Fire sprinkler heads with the brackets color coded green have a maximum ceiling temperature of ______
degrees - Answers 375
An gas supply line using a threaded connection between black iron pipe and plastic pipe is allowed -
Answers only outside and underground
What is the maximum size of a drilled hole in a 2 x 6 joist, drilled 2feet from the edge? - Answers 1-1/2
inch
What is the maximum drainage fixture units of a 6 inch drain line with a slope of 1/8 inch per foot? -
Answers 700
Connections for approved embedded piping in concrete hydronic
systems shall be connected using all of the following methods except: - Answers threaded
All water heaters, including the gas fired solar storage tank type heaters, installed in a seismic zone 3 or
4, shall be strapped at what points on the water heater? - Answers On the upper 1/3 and the lower 1/3
In a solar piping system the valve use to prevent thermal siphonage is
called? - Answers Check valve
Mechanically formed tee fittings shall be ____? - Answers Brazed
After Blue Stake has marked facilities, how many working days are the
markings good for? - Answers 15 days
Underground utilities are assigned color codes for identification. what color identifies electric power
distribution and transmission lines? - Answers Safety Red
, What is the weight of a gallon of water? - Answers 8.33 pounds
A gas pipe is being run through a oversized hole in a concrete wall, what should be done to hole? -
Answers Sleeved and sealed
On a black iron gas pipe installed in a wood frame wall by boring through the studs, what is the
minimum distance from the edge of the stud that a nail plate will be required? - Answers 1-1/2 inches
Which of the following is not required as part of a whirlpool bathtub installation - Answers Atmospheric
vacuum breaker
The minimum height at which a backflow preventer or vacuum breaker is installed above the flood level
of a fixture is called. - Answers critical level
A gas piping systems demand is 1,000,000 BTU's and has a developed
length of 75 feet. The specific gravity is 0.60, with a pressure drop of 0.5
inches of water column. The heating value of the gas is 1000. Using
schedule 40 metallic pipe, what minimum pipe size is required to supply this system? (Note: BTU's,
developed length, specific gravity, pressure drop and type of pipe can all change, know how to work and
use the 35 different tables.) - Answers 2 inch
The maximum length of a 2 inch trap arm to its vent shall not exceed _____. - Answers 8 feet
When the capacity of an isolated trapped section of a wet fire protection pipe is 10 gallons, what
minimum size auxiliary drain valve shall be provided? - Answers 3/4 inch valve with nipple and cap
An atmospheric-type vacuum breaker in a potable water line shall be set at least ____ inches above the
flood level rim of a fixture or device. - Answers 6 inches
A 3/4 inch steel pipe horizontally mounted shall be supported at intervals of no more than? - Answers
12 feet
Interceptors and separators shall be maintained how? - Answers Periodic removal of accumulated solids
Which is true about fire sprinklers? - Answers Sprinkler with green marking have a temperature
classification of very-extra-high
What is the maximum size hole allowed in a 2 x 6 exterior wall stud for a 3/4 inch copper tube? -
Answers 2-3/16 inch
A lavatory faucet is 3 inches from a wall and has a 1/2 inch effective opening. What is the required
minimum air gap? - Answers 1 inch
Tanks filled with propane shall not be stored: - Answers within a building
What is the name for the measurement taken along the center line of a pipe and fittings? - Answers
Developed Length
What is the minimum water seal depth on a sand interceptor? - Answers 6 inches
What is the minimum diameter of a sump pit being installed in the basement? - Answers 18 inches
When installing a pipe that can carry a maximum of 7000 DFU at a slope of 1/16 in per ft, what is the
minimum pipe size? - Answers 15 inch diameter
How many roof drains are required for a building 300 feet by 50 feet? - Answers 4
What may be added as anti-freeze when fire sprinklers are connected to potable water? - Answers
Glycerine
Fire sprinkler heads with the brackets color coded green have a maximum ceiling temperature of ______
degrees - Answers 375
An gas supply line using a threaded connection between black iron pipe and plastic pipe is allowed -
Answers only outside and underground
What is the maximum size of a drilled hole in a 2 x 6 joist, drilled 2feet from the edge? - Answers 1-1/2
inch
What is the maximum drainage fixture units of a 6 inch drain line with a slope of 1/8 inch per foot? -
Answers 700
Connections for approved embedded piping in concrete hydronic
systems shall be connected using all of the following methods except: - Answers threaded
All water heaters, including the gas fired solar storage tank type heaters, installed in a seismic zone 3 or
4, shall be strapped at what points on the water heater? - Answers On the upper 1/3 and the lower 1/3
In a solar piping system the valve use to prevent thermal siphonage is
called? - Answers Check valve
Mechanically formed tee fittings shall be ____? - Answers Brazed
After Blue Stake has marked facilities, how many working days are the
markings good for? - Answers 15 days
Underground utilities are assigned color codes for identification. what color identifies electric power
distribution and transmission lines? - Answers Safety Red
, What is the weight of a gallon of water? - Answers 8.33 pounds
A gas pipe is being run through a oversized hole in a concrete wall, what should be done to hole? -
Answers Sleeved and sealed
On a black iron gas pipe installed in a wood frame wall by boring through the studs, what is the
minimum distance from the edge of the stud that a nail plate will be required? - Answers 1-1/2 inches
Which of the following is not required as part of a whirlpool bathtub installation - Answers Atmospheric
vacuum breaker
The minimum height at which a backflow preventer or vacuum breaker is installed above the flood level
of a fixture is called. - Answers critical level
A gas piping systems demand is 1,000,000 BTU's and has a developed
length of 75 feet. The specific gravity is 0.60, with a pressure drop of 0.5
inches of water column. The heating value of the gas is 1000. Using
schedule 40 metallic pipe, what minimum pipe size is required to supply this system? (Note: BTU's,
developed length, specific gravity, pressure drop and type of pipe can all change, know how to work and
use the 35 different tables.) - Answers 2 inch
The maximum length of a 2 inch trap arm to its vent shall not exceed _____. - Answers 8 feet
When the capacity of an isolated trapped section of a wet fire protection pipe is 10 gallons, what
minimum size auxiliary drain valve shall be provided? - Answers 3/4 inch valve with nipple and cap
An atmospheric-type vacuum breaker in a potable water line shall be set at least ____ inches above the
flood level rim of a fixture or device. - Answers 6 inches
A 3/4 inch steel pipe horizontally mounted shall be supported at intervals of no more than? - Answers
12 feet
Interceptors and separators shall be maintained how? - Answers Periodic removal of accumulated solids
Which is true about fire sprinklers? - Answers Sprinkler with green marking have a temperature
classification of very-extra-high
What is the maximum size hole allowed in a 2 x 6 exterior wall stud for a 3/4 inch copper tube? -
Answers 2-3/16 inch
A lavatory faucet is 3 inches from a wall and has a 1/2 inch effective opening. What is the required
minimum air gap? - Answers 1 inch
Tanks filled with propane shall not be stored: - Answers within a building
