CSLB Class B General Contractor's License Exam Preparation
CSLB CLASS B GENERAL CONTRACTOR'S LICENSE EXAM
PREPARATION WITH COMPLETE QUESTIONS AND CORRECT
ANSWERS| BRAND NEW VERSION!
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
1|Page
, CSLB Class B General Contractor's License Exam Preparation
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
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
2|Page
, CSLB Class B General Contractor's License Exam Preparation
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
3|Page
, CSLB Class B General Contractor's License Exam Preparation
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.)
4|Page
CSLB CLASS B GENERAL CONTRACTOR'S LICENSE EXAM
PREPARATION WITH COMPLETE QUESTIONS AND CORRECT
ANSWERS| BRAND NEW VERSION!
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
1|Page
, CSLB Class B General Contractor's License Exam Preparation
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
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
2|Page
, CSLB Class B General Contractor's License Exam Preparation
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
3|Page
, CSLB Class B General Contractor's License Exam Preparation
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.)
4|Page
