CSLB Class B General Contractor's
License - Building's Exam
3 inches ✔✔ correct answer What is the minimum drain pipe size for the toilet in a residential
home?
B) Fire protection contractor ✔✔ correct answer Who is licensed to install residential fire sprinkler
systems?
A) Plumbing contractor
B) Fire protection contractor
C) General Building contractor
D) Pipeline contractor
C) Clean the surface using a power tool ✔✔ correct answer When brazing or soldering gas pipes
during the installation of water heaters, what is the best way to prepare the pipe?
A) Clean it with water
B) Blow into the pipe using your lungs
C) Clean the surface using a power tool
D) Use a pressurized air canister
D) Endless rope lift ✔✔ correct answer Which personal lift is not acceptable?
A) Scissor
B) Boom
C) Manual
D) Endless rope lift
B) To soften PVC pipe before applying PVC cement ✔✔ correct answer What is the purpose of PVC
primer?
A) To glue PVC pipes to other materials
B) To soften PVC pipe before applying PVC cement
,CSLB Class B General Contractor's
License - Building's Exam
C) To prevent electrical shock
D) To help solder conduit or piping
C) Flashing
(Leaks are most common when two surfaces meet or around fenestration. Leaks are most prominent
in valley flashing and improperly installed window flashing.) ✔✔ correct answer What is the most
common location to find a roof leak?
A) Attic
B) Shingles
C) Flashing
D) Collar tie
C) Pipe supports come into contact with metal piping
(Mainly due to water hammer.) ✔✔ correct answer What is the most common reason for noise in
piping when a water fixture is turned on or off?
A) Hot water was used
B) Cold water was used
C) Pipe supports come into contact with metal piping
D) The walls are not up to code causing pipe failure
C) Brass type ✔✔ correct answer If you send your employee to purchase a 2-inch water supply valve
and they return with a 1.5-inch supply valve, then what is the proper composition of the valve?
A) The casing must be made of plastic
B) The employee must return and purchase a wrought iron valve
C) Brass type
D) The connection must be silver and body made of iron
, CSLB Class B General Contractor's
License - Building's Exam
10 ✔✔ correct answer When penetrating a roof with an exhaust, the exhaust must be no closer
than _____ feet to any air intake or openable window.
A) Class A ✔✔ correct answer Which roof assembly has the best fire rating?
A) Class A
B) Class B
C) Class I
D) Class III
D) Use of materials that are compatible with the type of pipe and fitting materials ✔✔ correct
answer What does material compatibility refer to when installing alternate water sources in existing
plumbing systems?
A) Plumbing fixtures have to come from the same manufacturer
B) Only the couplings must be made of metal
C) All plumbing connections must be soldered or brazed
D) Use of materials that are compatible with the type of pipe and fitting materials
C) Weather seal, weather strip, and apply caulking ✔✔ correct answer When you have a gap in the
building envelope, what do you do to prevent air leakage?
A) Stuff insulation into gaps
B) Put caulking in and around the gaps
C) Weather seal, weather strip, and apply caulking
D) Nothing, all buildings require air leakage
18 inches ✔✔ correct answer In order to protect a water heater from damage, what is the minimum
height it should be from the floor of a garage?
License - Building's Exam
3 inches ✔✔ correct answer What is the minimum drain pipe size for the toilet in a residential
home?
B) Fire protection contractor ✔✔ correct answer Who is licensed to install residential fire sprinkler
systems?
A) Plumbing contractor
B) Fire protection contractor
C) General Building contractor
D) Pipeline contractor
C) Clean the surface using a power tool ✔✔ correct answer When brazing or soldering gas pipes
during the installation of water heaters, what is the best way to prepare the pipe?
A) Clean it with water
B) Blow into the pipe using your lungs
C) Clean the surface using a power tool
D) Use a pressurized air canister
D) Endless rope lift ✔✔ correct answer Which personal lift is not acceptable?
A) Scissor
B) Boom
C) Manual
D) Endless rope lift
B) To soften PVC pipe before applying PVC cement ✔✔ correct answer What is the purpose of PVC
primer?
A) To glue PVC pipes to other materials
B) To soften PVC pipe before applying PVC cement
,CSLB Class B General Contractor's
License - Building's Exam
C) To prevent electrical shock
D) To help solder conduit or piping
C) Flashing
(Leaks are most common when two surfaces meet or around fenestration. Leaks are most prominent
in valley flashing and improperly installed window flashing.) ✔✔ correct answer What is the most
common location to find a roof leak?
A) Attic
B) Shingles
C) Flashing
D) Collar tie
C) Pipe supports come into contact with metal piping
(Mainly due to water hammer.) ✔✔ correct answer What is the most common reason for noise in
piping when a water fixture is turned on or off?
A) Hot water was used
B) Cold water was used
C) Pipe supports come into contact with metal piping
D) The walls are not up to code causing pipe failure
C) Brass type ✔✔ correct answer If you send your employee to purchase a 2-inch water supply valve
and they return with a 1.5-inch supply valve, then what is the proper composition of the valve?
A) The casing must be made of plastic
B) The employee must return and purchase a wrought iron valve
C) Brass type
D) The connection must be silver and body made of iron
, CSLB Class B General Contractor's
License - Building's Exam
10 ✔✔ correct answer When penetrating a roof with an exhaust, the exhaust must be no closer
than _____ feet to any air intake or openable window.
A) Class A ✔✔ correct answer Which roof assembly has the best fire rating?
A) Class A
B) Class B
C) Class I
D) Class III
D) Use of materials that are compatible with the type of pipe and fitting materials ✔✔ correct
answer What does material compatibility refer to when installing alternate water sources in existing
plumbing systems?
A) Plumbing fixtures have to come from the same manufacturer
B) Only the couplings must be made of metal
C) All plumbing connections must be soldered or brazed
D) Use of materials that are compatible with the type of pipe and fitting materials
C) Weather seal, weather strip, and apply caulking ✔✔ correct answer When you have a gap in the
building envelope, what do you do to prevent air leakage?
A) Stuff insulation into gaps
B) Put caulking in and around the gaps
C) Weather seal, weather strip, and apply caulking
D) Nothing, all buildings require air leakage
18 inches ✔✔ correct answer In order to protect a water heater from damage, what is the minimum
height it should be from the floor of a garage?
