CSLB Class B General Contractor-s License - Building-s Exam Core Trades (Part 2) exam with correct answers

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? -
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correct answer ✔3 inches
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Who is licensed to install residential fire sprinkler systems?
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A) Plumbing contractor
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B) Fire protection contractor
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C) General Building contractor
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D) Pipeline contractor - correct answer ✔B) Fire protection contractor
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When brazing or soldering gas pipes during the installation of water
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heaters, what is the best way to prepare the pipe?
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A) Clean it with water
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B) Blow into the pipe using your lungs
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C) Clean the surface using a power tool
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D) Use a pressurized air canister - correct answer ✔C) Clean the surface
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using a power tool
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,Which personal lift is not acceptable?
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A) Scissor
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B) Boom
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C) Manual
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D) Endless rope lift - correct answer ✔D) Endless rope lift
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What is the purpose of PVC primer?
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A) To glue PVC pipes to other materials
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B) To soften PVC pipe before applying PVC cement
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C) To prevent electrical shock
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D) To help solder conduit or piping - correct answer ✔B) To soften PVC
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pipe before applying PVC cement
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What is the most common location to find a roof leak?
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A) Attic
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B) Shingles
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C) Flashing
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D) Collar tie - correct answer ✔C) Flashing
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(Leaks are most common when two surfaces meet or around fenestration.
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Leaks are most prominent in valley flashing and improperly installed
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window flashing.) ||

,What is the most common reason for noise in piping when a water fixture
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is turned on or off?
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A) Hot water was used
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B) Cold water was used
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C) Pipe supports come into contact with metal piping
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D) The walls are not up to code causing pipe failure - correct answer ✔C)
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Pipe supports come into contact with metal piping
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(Mainly due to water hammer.)
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If you send your employee to purchase a 2-inch water supply valve and
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they return with a 1.5-inch supply valve, then what is the proper
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composition of the valve? || || ||




A) The casing must be made of plastic
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B) The employee must return and purchase a wrought iron valve
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C) Brass type
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D) The connection must be silver and body made of iron - correct answer
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✔C) Brass type
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When penetrating a roof with an exhaust, the exhaust must be no closer
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than _____ feet to any air intake or openable window. - correct answer
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✔10

, Which roof assembly has the best fire rating?
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A) Class A
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B) Class B
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C) Class I
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D) Class III - correct answer ✔A) Class A
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What does material compatibility refer to when installing alternate water
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sources in existing plumbing systems?
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A) Plumbing fixtures have to come from the same manufacturer
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B) Only the couplings must be made of metal
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C) All plumbing connections must be soldered or brazed
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D) Use of materials that are compatible with the type of pipe and fitting
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materials - correct answer ✔D) Use of materials that are compatible with
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the type of pipe and fitting materials
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When you have a gap in the building envelope, what do you do to prevent
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air leakage?
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A) Stuff insulation into gaps
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B) Put caulking in and around the gaps
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C) Weather seal, weather strip, and apply caulking
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D) Nothing, all buildings require air leakage - correct answer ✔C) Weather
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seal, weather strip, and apply caulking
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