CSLB Class B General Contractor\\\'s License - Buildi
CSLB Class B General Contractor\\\'s License - Buildi
Exam (elaborations)
CSLB Class B General Contractor's License - Building's Exam: Core Trades (Part 2) (2025) Questions And Answers With Latest Updates
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CSLB Class B General Contractor\\\'s License - Buildi
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CSLB Class B General Contractor\\\'s License - Buildi
CSLB Class B General Contractor's License - Building's
Exam: Core Trades (Part 2) (2025) Questions And
Answers With Latest Updates
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) T...
CSLB Class B General Contractor's License - Building's
Exam: Core Trades (Part 2) (2025) Questions And
Answers With Latest Updates
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 - 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 - 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 - 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 - 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. - ANSWER -10
,Which roof assembly has the best fire rating?
A) Class A
B) Class B
C) Class I
D) Class III - 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 -
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 - ANSWER -C) Weather seal, weather strip,
and apply caulking
In order to protect a water heater from damage, what is the minimum height it should
be from the floor of a garage? - ANSWER -18 inches
How many plumbing fixtures can be vented by a single vertical wet-vent? - ANSWER -
4
(According to the California Plumbing Code, the vertical piping between two consecutive
inlet levels shall be considered a wet-vented section. Each wet-vented section shall be
not less than one pipe size exceeding the required minimum waste pipe size of the
upper fixture or shall be one pipe size exceeding the required minimum pipe size for the
sum of the fixture units served by such wet-vented section, whichever is larger, but no
case less than 2 inches.)
After the construction of a new home you turn on the faucet in the kitchen and the
water pressure is extremely low, how should you proceed to test the problem?
A) Call the inspector
B) Hire a plumbing contractor
C) Turn on the light switch
, D) Inspect the tank and pump for mechanical problems - ANSWER -D) Inspect the tank
and pump for mechanical problems
When drilling a 2 x 4 the minimum distance from the edge to the hole should be: -
ANSWER -5/8"
What is the minimum size a water supply pipe to a building? - ANSWER -0.75 inches
When do you wet a concrete block during installation? - ANSWER -Never
What is the minimum slope of a finished shower floor? - ANSWER -1/8 inch per foot
Section 408.5 of the California Plumbing Code states that the finished floor of the
receptor should slope uniformly from the sides towards the drain, not less than 1/8 inch
per foot, nor more than 1/2 inch per foot. For further clarification, the California
Plumbing Code refers to field-fabricated shower pans as "receptors." It is important not
to confuse the requirements in CPC 408.5 with CPC 408.7, which specifies that the
lining materials for showers and receptors should be pitched ¼ inch per foot towards
weep holes in the subdrain of a smooth and solidly formed subbase.
Who is responsible for final approval of plans on a public works project?
A) Engineer
B) Homeowner
C) City
D) Contractor - ANSWER -A) Engineer
Ventilation openings for foundations are at least ____ for every 150 square feet of
under-floor area. - ANSWER -1 square foot
(According to Title 24, the minimum net area of ventilation openings shall be not less
than 1 square foot for each 150 square feet of under-floor area. One ventilation opening
shall be within 3 feet of each corner of the building. Ventilation openings shall be
covered for their height and width with any of the following materials provided that the
least dimension of the covering shall not exceed 1/4 inch.)
A contractor is very cautious when adding water to concrete, why?
A) It ruins the consistency
B) Reduces the strength
C) Produces cracks
D) All of the above - ANSWER -D) All of the above
Which of the following directly affect the "load of the envelope"?
A) Ambient conditions
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