CR-37 Plumbing Practice Test

These questions are part of the practice quiz. Start practicing

• What does the code define as the flow of liquids into the distributing piles of a potable water system from an unintended source?
• What should be done with an abandoned water well to protect aquifers?
• What is the minimum horizontal clear distance required between seepage pits?
• What is the minimum hydrostatic test pressure required for low pressure steam and hot water heating system piping?
• What minimum slope per foot is permitted for a 3 inch building drain?
• What is the name of the interior drainage pipe that carries storm water from roof drain systems?
• What is the minimum pipe size required at a designated point labeled "H"?
• What is the minimum slope required for an above-ground waste pipe?
• At what minimum height above the flood level rim of the fixture must a vent pipe rise vertically before being offset horizontally?
• What type of valves are considered accessible in water piping systems?
• What color code is used by utility locators to indicate an underground gas line?
• Where are unprotected gas lines not allowed?
• What is the minimum diameter of a sump pit that is being installed in a basement?
• What common feature is used to prevent cross-connection in plumbing systems?
• A number 18 copper tracer wire or other approved material shall be installed with and adjacent to what type of piping?
• A flush tank water closet shall be equipped with an anti-siphon back-flow preventer located a minimum of how many inches above the opening of the overflow pipe?
• What pressure is caused by 12 inches of water in a water column at the bottom?
• Which material is commonly used for residential water supply lines?
• What is the required minimum distance from the trench or excavation that materials must be stored according to OSHA regulations?
• When installing a pressure relief line to the outside of a building, what is the maximum height above grade the end of the pipe can be?
• What is the purpose of a blowoff valve in a boiler system?
• Which of the following is an extension of a waste stack meant to provide venting?
• What is the maximum spacing for hanger supports for a 1 inch horizontal steel pipe?
• Hospitals are classified as what type of hazard occupancy?
• A BTU is defined as the amount of heat needed to raise the temperature of one what?
• When backfilling trenches, what is the recommended maximum depth of individual backfill layers?
• A work permit becomes invalid if no work is done for how many consecutive days?
• How much clear space must be present horizontally in front of a 4-inch cleanout?
• In the regeneration process of a water softener, what occurs?
• What does the term 'vapor pressure' refer to in the context of pump operation?
• Backflow prevention devices for hospital bedpan washer hoses must be positioned above the floor at what minimum height?
• What aspect of septic systems is crucial to prevent soil contamination?
• What factor affects the size of vent piping?
• What is used for venting only and carries no waste?
• A boiler outlet that allows for the emptying or discharge of sediment is defined as?
• What is the maximum distance allowed for the last support hanger on a fire sprinkler branch of 1-1/2 inch nominal pipe size from the end?
• For a drain system, what is the slope required for optimal water flow?
• What maximum fixture unit load is allowed on a 2 inch trap?
• When calculating the capacity of a pipe, which measurement is essential to obtain volume?
• What is considered the standard flush volume for modern toilets?
• What is the minimum pipe size required at a designated point labeled "B"?
• Strainer plates on drain inlets must be designed and installed so that no opening exceeds which dimension?
• How many water closets can be served by a 3 inch horizontal branch line?
• According to code, the size of any pump or discharge pipe from a sump (ejector) having a water closet connected thereto shall not be less than?
• What is the size of the pipe needed for section "A" of the Roof Drainage system, assuming a fall of 1/8" per foot and a 4 inch per hour rainfall?
• For building code compliance, what type of material should be avoided when constructing water closet bolts?
• What device in a hot water heating system allows trapped air to escape from the system?
• For a facility, how many water closets must be present for 200 occupants according to plumbing standards?
• What is one of the primary functions of a trap in a plumbing system?
• What is the minimum distance required between a septic tank and a house?
• In which of the following areas are unprotected gas lines allowed?
• What factor primarily impacts the excavation depth when dealing with sewer line installations?
• In a basement installation of a remote pump for a water well, how high must the pump be above the basement surface?
• In plumbing systems, which material is commonly used for tracer wire?
• What is the minimum size horizontal pipe required for a flat roof measuring 180 x 100 feet with 5 equally spaced roof drains?
• Where should the next clean out be located when a clean out is present at the bottom of a vent and waste vertical stack?
• A tile shower floor shall slope to the drain at how many inches per foot?
• Which type of pipe is primarily used for water distribution in fire protection systems?
• What is the minimum size disposal pipe allowed in a leach trench?
• According to code, what is the maximum diameter of a hole that may be bored in a 2x10 joist?
• What type of fitting is typically needed at point A in an ABS vent piping system?
• According to regulations, what is the minimum safe distance for a septic tank's wall thickness?
• A church with 500 members and 250 men should have how many water closets for women?
• When abandoning a septic tank, how many days must the department of environmental quality be notified within?
• A section of a water main pipe has been repaired and must be back in operation within 12 hours. The section shall be filled with a water/chlorine solution containing how many parts per million of chlorine?
• What material is used for the connection between the roof and the roof drain that passes through the roof?
• When installing a water service pipe in a trench with a sewer pipe, what is the minimum distance required between them?
• What is the maximum bend arc allowed for steel gas piping?
• According to code, the minimum size of a clean out plug on a 4 inch soil or sewer drain must be ______ inches?
• In terms of distance, how far from the end may the last support hanger on a fire sprinkler branch of 1 inch nominal pipe size be?
• In plumbing, what is referred to as a cross-section?
• According to OSHA, ladders or steps are required in all trenches or ditches at what depth for an adequate means of exit?
• Which backflow prevention device protects against back pressure?
• What is the maximum spacing for support of a 1.5 inch horizontal pipe?
• Shoring is required when the bottom of a sewer trench is lower than what minimum depth?
• In which situation is a threaded connection permitted between black iron pipe and plastic pipe?
• What is the name for the inside bottom elevation of a sewer line or drain pipe?
• What is the purpose of a backflow preventer?
• What is the lower limit of drainage fixture units for a residential building under the plumbing code?
• What is the minimum diameter required for a bathtub's waste overflow?
• An 8 inch sewer that has a 1/8 inch per foot slope is approved for what maximum drainage fixture unit load?
• On a 1-1/2 inch pipe, how many threads per inch can be found?
• What is the minimum distance required for a tub filler's air gap if the effective opening is 1 inch in diameter and not affected by the nearest side wall?
• What is the name for the exterior drainage pipe that carries storm water from roof drain systems?
• What is the PSI at the bottom of a 2-inch vertical pipe that is 20 feet high and filled with water?
• What material is typically used for gas piping in protected areas?
• What is required for a sump pump that discharges drainage that cannot rely on gravity?
• Waste water is being discharged from a hospital at 150 degrees F into a sanitary drainage system, what is required?
• What is the purpose of the check valve in the discharge line from a sewage ejector pump?
• When connecting a water source to a boiler, the supply pipe shall have which of the following?
• What is the maximum drainage fixture unit capacity of a 4 inch drain pipe with a slope of 1/4 inch per foot?
• When is it necessary to use shoring in excavation work?
• What phenomenon causes pump cavitation?
• Which valve is typically required for backflow prevention in plumbing systems?
• What is the maximum number of drainage fixture units that a 4-inch trap arm can handle?
• When abandoning a septic tank, who should be notified?
• Trenches that are over-excavated and require backfilling below the level of the pipe shall be backfilled in layers not exceeding:
• Where should condensate from cooling coils and evaporators be conveyed from the drain pan outlet?
• What is the minimum required height of the termination point of a vent pipe above a sun deck?
• If a pipe has an inside diameter of 3 inches and it is 20 feet long, what is its volume?
• What is the primary purpose of installing a reverse osmosis drinking water treatment unit?
• What is the maximum angle from vertical allowed for a vertical vent before it is considered horizontal?
• What is the minimum distance required in clear space from a septic tank to a building or structure?
• What minimum pressure is required to test a drainage system with air?
• What is the maximum rainfall that the drains on a sloped roof can handle?
• What is an approved adaptor to connect copper to PVC piping?
• Which statement about fixtures with concealed slip-joint connections is true?
• Which item is not permitted in a public restroom?
• What is the implication of a gas line marked in yellow?
• How many days in advance must someone notify the blue stake location center before beginning any excavation?
• What type of valve must be installed at each building water supply line?
• What is required for materials used in medical gas piping systems?
• What must be installed in a gas pipe when condensation is present in a fuel gas line?
• What pressure does 14 inches of water in a water column exert?
• What is the maximum drainage fixture units allowed for a 6 inch drain line with a slope of 1/8 inch per foot?
• In plumbing, what does the term "air gap" refer to?
• A gas pressure of 14 inches of water column is equivalent to how many psi?
• What size of pipe is typically used to feed a fire hydrant on private property?
• Which testing medium should not be used to pressure test a fuel gas piping system?
• What is the name of the backflow prevention device commonly used?
• What is the total length from "A" to "G" based on project parameters?
• How many water closets are required for a dormitory that houses 200 girls?
• What is the minimum slope required for a roof drain gutter?
• What size vent is required for a roof storm drain?
• What is the number of square inches of the sidewall area of a seepage pit that measures 6 feet across and 14 feet deep?
• What is the purpose of a vent pipe in a plumbing system?
• For a low hazard boiler system that does not require chemical additives but has the potential to cause back pressure, what minimum backflow protection is necessary?
• What is the pressure representation of a water column that is 30 inches high?
• What is the minimum size building sewer for a residential home?
• What type of valve is used to allow water to flow in one direction while preventing backflow?
• What is the total length from "B" to "E" if given the parameters of the project?
• What is the primary purpose of backflow prevention devices in hospital settings?
• According to code, how thick should the filter material over drain lines in disposal fields and trenches be at a minimum?
• No excavation for a sewage seepage pit, disposal field or septic system shall extend closer than how many feet to a water main or branch water line?
• What is the maximum number of single compartment sinks that a single trap may serve?
• What is the maximum spacing for supporting a 3/4 inch steel pipe mounted horizontally?
• For a single-story building rated as ordinary hazard and measuring 298,000 square feet, how many fire sprinkler risers are required?
• How many parts per million of chlorine is required for a water main repair solution?
• What is the minimum thickness of aggregate material required under a disposal pipe?
• What is the minimum depth at which employees must be protected from cave-ins by adequate protective systems according to OSHA?
• How many spare fire sprinkler heads should be kept in a building with 313 installed sprinkler heads?
• Which feature is required for a grease trap?
• Which of the following is a key safety requirement during trenching and excavation?
• What type of vent is typically referred to as "individual" in plumbing?
• What is the term for the section of the pipe that allows for returning air to the system in plumbing?
• What type of valve must be provided in the discharge line from a sewage ejector pump?
• What is the purpose of an air gap in plumbing?
• What is the approximate weight of one cubic foot of water?
• Mechanically formed tee fittings shall be _______?
• What is the minimum fixture branch pipe size for a hose bibb located 80 feet from the meter with 55 psi available?
• What minimum slope is required per foot of a 4 inch horizontal drain pipe?
• What is the correct center to center length of the diagonal "A" in a one inch pipe offset that uses 45 degree elbows and has an offset distance of 8 inches at "B"?
• If a building has a non-potable water system installed, what is the minimum size lettering that must be used in warning signs?
• What is the primary purpose of an expansion tank in a plumbing system?
• What is the maximum percent of lead content allowed in solder for a copper water pipe system?
• When joining PVC piping, what type of adhesive should be used?
• Which type of water closet connection is permitted when using back to back water closets with a double sanitary tee?
• What is the purpose of installation of tracer wire with underground piping?
• According to OSHA, how much water can accumulate in an excavation before employees must stop work?
• A pressure reducing valve on the water distribution line shall be set at a maximum pressure of ______ psi?
• Which of the following is NOT required as part of a whirlpool bathtub installation?
• How much deeper should a septic pit be excavated to verify underlying soil characteristics?
• In a vertical piping system, which configuration serves as both a vent and a drain?
• What is a consequence of not notifying the environmental quality department within the specified time when abandoning a septic tank?
• One trap may serve a set of how many sinks that are adjacent to each other in the same room and are no further than 30 inches on center?
• What is the minimum height that standpipe receptors for clothes washers must extend above the trap?
• After blue stake has marked facilities, how many working days are the markings good for?
• In sewer systems, what does "A" typically represent?
• What is a common requirement for ensuring the safety of trench work?
• What is the minimum side wall depth required below the inlet of each seepage pit?
• Where should tanks filled with propane not be stored?
• Each fixture trap shall have a water seal of not more than how many inches?
• What is the minimum size drain pipe allowed for a clothes washer?
• The term "wet vent" primarily refers to what aspect of plumbing?
• What is the minimum liquid depth from the bottom of the tank to the bottom of the outlet in a septic tank?
• What is the volume of a pipe with an inside diameter of 2 inches and a length of 14 feet?
• For a 5-bedroom house with a garbage disposal, what is the minimum size septic tank required by code?
• A tank that flushes more than one urinal:
• What is the main purpose of an auxiliary drain valve in a fire protection system?
• What is the term for the pipe measurement known as "face to face"?
• What is the maximum distance a person shall travel to reach a ladder in a trench that is 4 feet deep, according to OSHA?
• Vertical gas piping, 2 inches in diameter shall be supported at what maximum intervals?
• When attaching a water closet to a flange, what type of bolt should be used?
• What is the minimum required depth for a residential sewer line installed below ground?
• What is the term for the measurement taken along the center line of a pipe and fitting?
• What is the drainage fixture units assigned to an emergency floor drain?
• Which of the following materials is NOT approved for the construction of septic tanks?
• What is the maximum size for a drilled hole in a 2 x 6 joist, drilled 2 feet from the edge?
• What is the standard minimum size of a pipe for a leach trench disposal?
• The discharge from a reverse osmosis drinking water treatment unit should enter the drainage system through what?
• A repaired water main need to be disinfected and activated within 30 hours. What is the minimum water/chlorine solution that must be put into the main?
• What is the minimum required distance for vertical vent installation if it exceeds the specified angle?
• What is the minimum distance a septic tank should be placed from a driveway?
• When preparing to turn on a 12-inch water main within 12 hours, what is the required amount of chlorine?
• What is the depth of the trench that needs to be excavated if the incline of the sewer line is 1/8 inch per foot?
• How is the required size of stormwater drains and sewers for roofs usually determined?
• What is the maximum distance for the last support hanger on a fire sprinkler branch of a 1-1/4" nominal pipe size from the end?
• Which of the following is the correct measurement for one cubic foot of water in pounds?
• Which material can screws and bolts securing water closets to the floor plane be made of?
• According to plumbing codes, how should the last support for a 1-inch pipe be secured relative to its length?
• What is the total length of pipe development from point A to point C?
• How many fire sprinkler risers are required for a single-story building of 2600 square feet?
• What is the significance of the measurement of pressure on a liquid in pump systems?
• What is the weight of a gallon of water?
• According to code, what is the minimum size of a trap for three lavatories connected to one trap?
• For a gas meter located inside a building, how should a pressure regulator be configured?
• What is the minimum approved wall thickness for any approved steel septic tank?
• Water piping supplying three single-family residences on a single premises shall be equipped with a separate what type of valve?
• What is the difference in drainage Fixture Units between a bathtub with an overhead shower and a bathtub with whirlpool attachments?
• What is the unobstructed vertical distance from a discharge pipe to the flood level rim of a fixture called?
• What is the minimum depth of clean fill required over a sewer pipe before completing backfill?
• What is the maximum spacing for lateral bracing of a wet pipe fire protection sprinkler system main supply pipe?
• What is the code's term for the point where a water softener backwash drain discharges above the flood level rim of a floor drain?
• What is the minimum slope required for an 8-inch horizontal drainage pipe?
• To ensure proper compactness around piping, trenches must be backfilled within clean earth to what minimum height above the top of the pipe?
• What is the minimum width of a trench bottom in a disposal field?
• What is the minimum feet of head required to test a rough drainage and venting system?
• What fixture unit load does each gallon per minute (GPM) of a continuous flow pump or similar fixture produce?
• What is replaced by sodium ions during the water softening process?
• What does the OSHA requirement enforce regarding trench safety?
• What type of connection requires access to facilitate maintenance or repairs?
• When installing a pipe that can carry a maximum of 7,000 DFU at a slope of 1/16 inch per foot, what is the minimum pipe size?
• Which of the following locations does not require fire sprinklers?
• What is the minimum horizontal developed length allowed between the outlet of a water closet and the connection to a double sanitary tee pattern?
• What is the volume in cubic inches of a pipe that has an inside diameter of 2 inches and is 20 feet long?
• What minimum separation is required between a residential septic tank disposal field and a domestic service water line?
• What is the minimum slope permitted for a 3 inch sewer pipe?
• What is the standard fixture unit capacity for a 2 inch vertical drain?
• What is the maximum permissible slope for a disposal pipe?
• For a drain to function properly, what is its required minimum diameter?
• Which statement is true regarding fire sprinklers?
• What is the primary purpose of a trench ladder in plumbing installations?
• What is the ideal PSI for optimal performance of household water systems?
• Gas piping supplying more than one building on any one premises must be equipped with what feature?
• What is the minimum size of the auxiliary drain valve for a trapped section of a wet fire protection pipe with a capacity of 10 gallons?
• The maximum length of a 2 inch trap arm to its vent shall not exceed how many feet?
• The building sewer is that part of the horizontal drainage piping that begins at what distance outside the building wall?
• At what maximum temperature can polybutylene pipe be used in hot water hydronic heating systems?
• What must be installed on the discharge pipe of a pump located in the sump pit of a basement?
• What is the minimum thickness of a nail plate used to protect pipe in a wall?
• What is the maximum number of fixture units a 6 inch horizontal drain can accommodate?
• How often must 3/4" steel fuel gas piping installed horizontally be supported?
• How many backup water supply systems must hospitals have?
• What is the minimum pressure required for a siphoning flushometer water closet?
• The minimum depth of filter material under the drain lines of a disposal field shall not be less than how many inches?
• What is the minimum height for a gas water heater's pilot light above the garage floor?
• Which scenario would most likely require testing of drainage and venting systems?
• Blue stake uses orange to mark which of the following?
• What color mark is used to indicate hard drawn type L copper tubing?
• The sidewalls of a septic tank must extend above the liquid depth by how many inches?
• Which of the following is NOT required to calculate water pipe sizes?
• 3/4 inch steel fuel gas piping installed horizontally must be supported at intervals not exceeding what distance?
• A 3 inch diameter pipe that is 20 feet long contains how many cubic inches of water?