CR-37 Plumbing Exam Study
Guide – Practice Questions
with Verified Answers. GRADED
A+. Latest 2026/2027 Update
What is the minimum over dig for a seepage pit to determine base of
seepage pit? - Answer✔✔-5'
Blue stake markings are good for what maximum period of time? -
Answer✔✔-15 Days
A common vent vents which of the following? - Answer✔✔-Two
Traps
What is the internal volume of 3" pipe 20' long? - Answer✔✔-1696
cu inches
No vent is required for a waste drain if under what length? -
Answer✔✔-5'
,How can fuel gas Iron piping not be jpined - Answer✔✔-Compression
fittings
a 12 inch water column of water exerts how much pressure at the
bottom of the column? - Answer✔✔-.43psi
Floor drains shall have what minimum opening? - Answer✔✔-2"
What backflow device is used for a boiler water supply system? -
Answer✔✔-backflow preventer with intermediate atmospheric vents
AZDEQ Requires a permit if disturbing what minimum amount of
ground during construction? - Answer✔✔-1 acre
A willful violation of an OSHA rule carries what minimum fine? -
Answer✔✔-$70,000
A vertical vent stacks with an offset at 45 degrees or less have their
length calculated as? - Answer✔✔-a straight pipe
Fuel gas pipping installed at what distance from the edge of a wall
stud does not need a nailing or protective plate - Answer✔✔-over 1
1/2"
, What defines vacuum - Answer✔✔-Pressure less than atmospheric
What is the minimum vertical separation between a vitrified clay pipe
sewer line crossing under a water supply? - Answer✔✔-12"
What is the minimum trap size for a single lavatory - Answer✔✔-1
1/4"
What is the minimum diameter pipe for supply to a kitchen sink
fixture - Answer✔✔-1/2"
Metallic fuel gas piping cannot be joined using which of the
following? - Answer✔✔-compression fittings
What is the minimum cover of gravel for distribution piping -
Answer✔✔-2"
Who is responsible for the final set up of boiler controls on a newly
installed boiler system? - Answer✔✔-installer
What is the minimum number of threads cut on any end of the fuel
gas pipe - Answer✔✔-10
Guide – Practice Questions
with Verified Answers. GRADED
A+. Latest 2026/2027 Update
What is the minimum over dig for a seepage pit to determine base of
seepage pit? - Answer✔✔-5'
Blue stake markings are good for what maximum period of time? -
Answer✔✔-15 Days
A common vent vents which of the following? - Answer✔✔-Two
Traps
What is the internal volume of 3" pipe 20' long? - Answer✔✔-1696
cu inches
No vent is required for a waste drain if under what length? -
Answer✔✔-5'
,How can fuel gas Iron piping not be jpined - Answer✔✔-Compression
fittings
a 12 inch water column of water exerts how much pressure at the
bottom of the column? - Answer✔✔-.43psi
Floor drains shall have what minimum opening? - Answer✔✔-2"
What backflow device is used for a boiler water supply system? -
Answer✔✔-backflow preventer with intermediate atmospheric vents
AZDEQ Requires a permit if disturbing what minimum amount of
ground during construction? - Answer✔✔-1 acre
A willful violation of an OSHA rule carries what minimum fine? -
Answer✔✔-$70,000
A vertical vent stacks with an offset at 45 degrees or less have their
length calculated as? - Answer✔✔-a straight pipe
Fuel gas pipping installed at what distance from the edge of a wall
stud does not need a nailing or protective plate - Answer✔✔-over 1
1/2"
, What defines vacuum - Answer✔✔-Pressure less than atmospheric
What is the minimum vertical separation between a vitrified clay pipe
sewer line crossing under a water supply? - Answer✔✔-12"
What is the minimum trap size for a single lavatory - Answer✔✔-1
1/4"
What is the minimum diameter pipe for supply to a kitchen sink
fixture - Answer✔✔-1/2"
Metallic fuel gas piping cannot be joined using which of the
following? - Answer✔✔-compression fittings
What is the minimum cover of gravel for distribution piping -
Answer✔✔-2"
Who is responsible for the final set up of boiler controls on a newly
installed boiler system? - Answer✔✔-installer
What is the minimum number of threads cut on any end of the fuel
gas pipe - Answer✔✔-10
