CSLB Class B General Contractor's
License - Building's Exam Core Trades
(Part 2) exam with correct answers
What is the minimum drain pipe size for the toilet in a residential home? -
|| || || || || || || || || || || || || ||
correct answer ✔3 inches
|| || || ||
Who is licensed to install residential fire sprinkler systems?
|| || || || || || || ||
A) Plumbing contractor
|| ||
B) Fire protection contractor
|| || ||
C) General Building contractor
|| || ||
D) Pipeline contractor - correct answer ✔B) Fire protection contractor
|| || || || || || || || ||
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 - correct answer ✔C) Clean the surface
|| || || || || || || || || || || || ||
using a power tool
|| || ||
,Which personal lift is not acceptable?
|| || || || ||
A) Scissor
||
B) Boom
||
C) Manual
||
D) Endless rope lift - correct answer ✔D) Endless rope lift
|| || || || || || || || || ||
What is the purpose of PVC primer?
|| || || || || ||
A) To glue PVC pipes to other materials
|| || || || || || ||
B) To soften PVC pipe before applying PVC cement
|| || || || || || || ||
C) To prevent electrical shock
|| || || ||
D) To help solder conduit or piping - correct answer ✔B) To soften PVC
|| || || || || || || || || || || || || ||
pipe before applying PVC cement
|| || || ||
What is the most common location to find a roof leak?
|| || || || || || || || || ||
A) Attic
||
B) Shingles
||
C) Flashing
||
D) Collar tie - correct answer ✔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.) ||
,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 - correct answer ✔C)
|| || || || || || || || || || || || || || ||
Pipe supports come into contact with metal piping
|| || || || || || ||
(Mainly due to water hammer.)
|| || || ||
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 - correct answer
|| || || || || || || || || || || || || ||
✔C) Brass type
|| ||
When penetrating a roof with an exhaust, the exhaust must be no closer
|| || || || || || || || || || || || ||
than _____ feet to any air intake or openable window. - correct answer
|| || || || || || || || || || || || ||
✔10
, Which roof assembly has the best fire rating?
|| || || || || || ||
A) Class A
|| ||
B) Class B
|| ||
C) Class I
|| ||
D) Class III - correct answer ✔A) Class A
|| || || || || || || ||
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 - correct answer ✔D) Use of materials that are compatible with
|| || || || || || || || || || || ||
the type of pipe and fitting materials
|| || || || || ||
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 - correct answer ✔C) Weather
|| || || || || || || || || || || ||
seal, weather strip, and apply caulking
|| || || || ||
License - Building's Exam Core Trades
(Part 2) exam with correct answers
What is the minimum drain pipe size for the toilet in a residential home? -
|| || || || || || || || || || || || || ||
correct answer ✔3 inches
|| || || ||
Who is licensed to install residential fire sprinkler systems?
|| || || || || || || ||
A) Plumbing contractor
|| ||
B) Fire protection contractor
|| || ||
C) General Building contractor
|| || ||
D) Pipeline contractor - correct answer ✔B) Fire protection contractor
|| || || || || || || || ||
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 - correct answer ✔C) Clean the surface
|| || || || || || || || || || || || ||
using a power tool
|| || ||
,Which personal lift is not acceptable?
|| || || || ||
A) Scissor
||
B) Boom
||
C) Manual
||
D) Endless rope lift - correct answer ✔D) Endless rope lift
|| || || || || || || || || ||
What is the purpose of PVC primer?
|| || || || || ||
A) To glue PVC pipes to other materials
|| || || || || || ||
B) To soften PVC pipe before applying PVC cement
|| || || || || || || ||
C) To prevent electrical shock
|| || || ||
D) To help solder conduit or piping - correct answer ✔B) To soften PVC
|| || || || || || || || || || || || || ||
pipe before applying PVC cement
|| || || ||
What is the most common location to find a roof leak?
|| || || || || || || || || ||
A) Attic
||
B) Shingles
||
C) Flashing
||
D) Collar tie - correct answer ✔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.) ||
,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 - correct answer ✔C)
|| || || || || || || || || || || || || || ||
Pipe supports come into contact with metal piping
|| || || || || || ||
(Mainly due to water hammer.)
|| || || ||
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 - correct answer
|| || || || || || || || || || || || || ||
✔C) Brass type
|| ||
When penetrating a roof with an exhaust, the exhaust must be no closer
|| || || || || || || || || || || || ||
than _____ feet to any air intake or openable window. - correct answer
|| || || || || || || || || || || || ||
✔10
, Which roof assembly has the best fire rating?
|| || || || || || ||
A) Class A
|| ||
B) Class B
|| ||
C) Class I
|| ||
D) Class III - correct answer ✔A) Class A
|| || || || || || || ||
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 - correct answer ✔D) Use of materials that are compatible with
|| || || || || || || || || || || ||
the type of pipe and fitting materials
|| || || || || ||
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 - correct answer ✔C) Weather
|| || || || || || || || || || || ||
seal, weather strip, and apply caulking
|| || || || ||
