CSLB CONTRACTORS EXAM PRACTICE
QUESTIONS AND ANSWERS
COMPREHENSIVE EXAM REVIEW 2026
FULL SOLUTION STUDY GUIDE
⩥ aerator. Answer: A device used to mix air and water with water
distribution and water conservation in mind; e.g., faucets.
⩥ air gap (drainage system). Answer: The unobstructed vertical distance
through the free atmosphere between the outlet of a
waste pipe and the flood level rim of the receptacle into which the waste
pipe is discharging
⩥ backflow. Answer: Pressure created by any means in the water
distribution system, which, by being in excess of the pressure in the
water supply mains, causes a potential _________ condition
⩥ back pressure, low head. Answer: A pressure less than or equal to 4.33
psi (29.88 kPa) or the pressure exerted by a 10-foot
(3048 mm), column of water
⩥ back siphonage. Answer: The backflow of potentially contaminated
water into the potable water system as a result of the pressure in the
potable water system falling below atmospheric pressure of the
, plumbing fixtures, pools, tanl‹s, or vats connected to the potable water
distribution piping.
⩥ backwater valve. Answer: A device or valve installed in the building
drain or sewer pipe where a sewer is subject to backflow, which prevents
drainage or waste from bacl‹ing up into a low level or fixtures and
causing a flooding condition.
⩥ drainage. Answer: A reversal of flow in the drainage system.
⩥ backflow presenter. Answer: A device or means to prevent the flow
water or other liquids, mixtures or substances into the distributing pipe
of a potable supply of water, or into any other fixture or appliance from
any source other than its intended course.
⩥ bathroom group. Answer: A group of fixtures consisting of a water
closet, lavatory, bathtub or shower, including or
excluding a bidet, an emergency floor drain, or both. Such fixtures are
located
⩥ battery of fixtures. Answer: Any group of two or more similar
adjacent plumbing fixtures that discharges into a common horizontal
waste or soil branch.
QUESTIONS AND ANSWERS
COMPREHENSIVE EXAM REVIEW 2026
FULL SOLUTION STUDY GUIDE
⩥ aerator. Answer: A device used to mix air and water with water
distribution and water conservation in mind; e.g., faucets.
⩥ air gap (drainage system). Answer: The unobstructed vertical distance
through the free atmosphere between the outlet of a
waste pipe and the flood level rim of the receptacle into which the waste
pipe is discharging
⩥ backflow. Answer: Pressure created by any means in the water
distribution system, which, by being in excess of the pressure in the
water supply mains, causes a potential _________ condition
⩥ back pressure, low head. Answer: A pressure less than or equal to 4.33
psi (29.88 kPa) or the pressure exerted by a 10-foot
(3048 mm), column of water
⩥ back siphonage. Answer: The backflow of potentially contaminated
water into the potable water system as a result of the pressure in the
potable water system falling below atmospheric pressure of the
, plumbing fixtures, pools, tanl‹s, or vats connected to the potable water
distribution piping.
⩥ backwater valve. Answer: A device or valve installed in the building
drain or sewer pipe where a sewer is subject to backflow, which prevents
drainage or waste from bacl‹ing up into a low level or fixtures and
causing a flooding condition.
⩥ drainage. Answer: A reversal of flow in the drainage system.
⩥ backflow presenter. Answer: A device or means to prevent the flow
water or other liquids, mixtures or substances into the distributing pipe
of a potable supply of water, or into any other fixture or appliance from
any source other than its intended course.
⩥ bathroom group. Answer: A group of fixtures consisting of a water
closet, lavatory, bathtub or shower, including or
excluding a bidet, an emergency floor drain, or both. Such fixtures are
located
⩥ battery of fixtures. Answer: Any group of two or more similar
adjacent plumbing fixtures that discharges into a common horizontal
waste or soil branch.
