InterNACHI Plumbing Practice Exam

Browse all practice questions for the InterNACHI Plumbing Practice Exam. Search by topic, open any question and review its full explanation, then test yourself in the practice quiz.

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How the Shape of a Cleanout Affects Plug RemovalThe square shape of a cleanout ________ the possibility of stripping the plug during removal.How Wide Should a Shower Entry Be for Accessibility?What should the width of a shower entry be to ensure accessibility?Learn why storm water should never go into sewersDrainage of storm water, rainwater, or groundwater should not be directed into which of the following?The Rise and Fall of Polybutylene in Plumbing SystemsWhich plumbing material is known to have been widely used before newer regulations discouraged its use?Understanding How Plumbing System Age Affects Water QualityWhich of the following can affect a home's water supply quality?Understanding the Best Method for Preventing Backflow in PlumbingWhat is considered the most effective and dependable method of preventing backflow?Understanding the Ideal Space in Front of a LavatoryHow much space should be in front of a lavatory in relation to a wall, fixture or door?Understanding the Importance of Air Gaps in Plumbing SystemsThe unobstructed vertical distance through the free atmosphere between an outlet and the rim best defines what?Understanding the Importance of Proper Vent Pipe HeightHow high should the vent pipe that passes through the roof terminate above the roof line?Understanding the Importance of Reporting Leaky Faucets During Plumbing InspectionsIs it necessary to report on leaky faucets during a plumbing inspection?Understanding the Importance of Type K Copper Tubing in PlumbingType K copper tubing is the ________ and typically used for underground water service.Understanding the Importance of Using a Check Valve in Your Sump PumpThe discharge pipe on a sump pump should have a _________ installed to prevent previously pumped discharge from returning to the pump.Understanding the Importance of Vent Pipes Above the SnowlineWhy is it important for the vent pipe to be above the snowline?Understanding the Importance of Vent Pipes in Plumbing SystemsHow many vent pipes should extend to the outdoor air for a dwelling?Understanding the Key Factors Influencing Plumbing Drainage SystemsWhat factor influences the effectiveness of plumbing drainage systems?Understanding the Minimum Liquid Seal Height Required for Fixture TrapsWhat is the minimum liquid seal height required for fixture traps?Understanding the Role of Elbow Fittings in Plumbing SystemsWhat fitting is used to connect different plumbing sections to allow for changes in direction?Understanding What Plumbing Systems Should Avoid Drum TrapsWhat should not be connected to plumbing systems that do not allow drainage?What Should Inspectors Do When Plumbing Systems Show Signs of Wear?When a plumbing system shows signs of wear, what should inspectors do?What temperature defines hot water?Hot water is defined as water at what temperature or higher?What You Need to Know About Backflow in Plumbing SystemsIn plumbing terminology, what does the term 'backflow' refer to?What’s the Ideal Height for Well Casing Above Ground?How many inches should a well casing extend above the ground surface?When's the Best Time to Check Water Pressure in Your Home?At which point in a dwelling is it best to observe water pressure at fixtures?
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  • What is another term for a bathroom or washroom sink?
  • What component is critical in preventing siphonage in plumbing systems?
  • Is it true that rocks or blocks can support drainage piping inside a trench?
  • How should an access opening for mechanical equipment, such as a water heater, be designed?
  • Is solvent-cementing between ABS and PVC pipe allowed?
  • Must an inspector examine a home for polybutylene plumbing?
  • What does the term 'venting' primarily refer to in plumbing?
  • The _______ connector should enter at the highest level where two or more vent connectors enter a common gas vent, chimney flue, or single-wall metal pipe.
  • What is the minimum slope required for a horizontal drain pipe sized between 3 and 6 inches?
  • How should functional water flow be evaluated?
  • What feature is essential for a cleanout in plumbing systems?
  • How should an access opening for a whirlpool bathtub be sized if the pump is more than 2 feet away?
  • From which areas may fuel-fired water heaters NOT obtain combustion air?
  • What is the maximum horizontal spacing for supporting cast-iron pipe?
  • True or False: All visible wastes, drains, and vents must be inspected by inspectors.
  • What inessential characteristics of laundry trays are not allowed in construction?
  • What should any vent terminal be positioned in relation to an opening?
  • Is a shut-off valve the same as a full-open valve?
  • The U.S. EPA's Office of Drinking Water controls the quality of water classified as what?
  • What is the minimum height above the tub floor surface for an exterior window to not require safety glazing?
  • What is the minimum interior cross-sectional area required for a shower compartment?
  • What is the minimum height above the trap for a standpipe, such as that used for a clothes washer?
  • What device is used to relieve excessive pressure within a water heater?
  • What is the minimum drop in grade required within the first 10 feet to ensure proper drainage away from foundation walls?
  • Obstructions, such as rocks or blocks, at any point inside a trench ________ provide adequate support for drainage piping.
  • How far must the building drain extend beyond the exterior building walls?
  • The waste from an automatic clothes washer must discharge its water through what type of device?
  • What should be done if a manual damper is found in a gas appliance setup?
  • How high should the termination for gas vent pipes be for roofs with a pitch of up to 6:12?
  • Which valve is primarily used to control water flow in a plumbing system?
  • Which of the following is essential to maintain in a residential plumbing system?
  • At what temperature, in degrees Fahrenheit, is the maximum water temperature typically limited to by a water temperature limiting device?
  • At what temperature must TPR valves be set to discharge at most?
  • This course addresses which aspects of plumbing?
  • Are sump pumps included in the standard items for a home inspection?
  • How many inches should casings for private wells extend above the ground surface?
  • Where should the TPR discharge pipe be directed?
  • What type of vent pipes should have protection against freezing?
  • Determining the location of the main water supply shut-off valve is considered?
  • True or False: Inspectors should flush all toilets as part of their inspection process.
  • Should the plumbing inspection report include the types of supply piping inspected?
  • What is a water closet commonly referred to as in plumbing standards?
  • Is an inspector required to light pilot lights during an inspection?
  • What is the minimum diameter typically required for a water service pipe?
  • What is the maximum horizontal spacing for PVC drainage pipe?
  • Is a shut-off switch or disconnect required for all electric water heaters?
  • What is the lowest pipe in a drainage system called?
  • If a home inspector sees a fuel storage tank, how should it be treated in the report?
  • If a pump at a whirlpool bathtub is located more than 2 feet from the access opening, what is the minimum size opening that should be installed?
  • What is required to be installed on a sump pump's discharge pipe to prevent backflow?
  • Why is evaluating water softeners significant during an inspection?
  • Which type of vent connector configuration is generally more efficient for gas appliances?
  • What does a check valve do in a plumbing system?
  • How deep is a well categorized as a deep well?
  • What type of chemicals are used in the construction of plastic bathtubs to ensure fire safety?
  • Which organization controls the quality requirements for water to be classified as potable in the U.S.?
  • How far should a plumbing DWV vent termination be horizontally away from a door or window?
  • What is the acceptable installation practice for gas vent pipes?
  • What is the common term for a lavatory?
  • What temperature is considered safe for water in bathtubs by regulations?
  • What does the term "plumbing" derive from in Latin?
  • What must inspectors determine regarding main water and fuel shut-off valves?
  • Which of the following is NOT an acceptable installation for vent pipes according to plumbing codes?
  • Which condition is vital for a plumbing vent to keep trap seals intact?
  • What are short lengths of pipe attached directly to a fixture called?
  • A cleanout plug or removable trap section should be installed on traps located below which of the following?
  • The DWV system of the dwelling should be tested with a minimum _______ head of water for ______.
  • Where should the TPR discharge pipe discharge through?
  • What is a common characteristic of soft brass in plumbing?
  • Which type of traps are NOT permitted as they impede drainage flow?
  • What is the minimum diameter of a water service pipe?
  • Can contamination impact the potability of water?
  • What should inspectors verify about faucets in a plumbing inspection?
  • What should the installation of supply lines and fittings for all fixtures prevent?
  • A plumbing inspection should always include which of the following actions regarding faucets?
  • According to InterNACHI Standards, what are inspectors required to do with all toilets?
  • What factor is critical for the installation of vent pipes?
  • What is the minimum slope of a horizontal drainpipe that is sized between 3 and 6 inches?
  • What is a critical factor in the placement of gas vent pipes?
  • What is the minimum height for a clothes washer standpipe above the trap?
  • What is the primary purpose of a sediment trap in plumbing systems?
  • According to standards, how should plumbing pipes be positioned relative to one another?
  • Which type of traps is not permitted in plumbing?
  • Are inspectors required to operate all plumbing and fuel shut-off valves during an inspection?
  • What is the maximum height of the liquid seal in fixture traps, except for specially-designed fixtures?
  • What is required when a water heater is installed in an attic?
  • When two or more vent connectors enter a common gas vent, which connector should enter at the highest level?
  • What type of plumbing concern is polybutylene considered to be?
  • In what space designation is the volume of space not greater than 50 cubic feet per 1,000 BTU/h of appliance input rating classified?
  • True or False: Many old tailpieces and traps are made of durable materials.
  • In plumbing practices, what is the purpose of a water closet?
  • A relief-valve pipe terminating into a water leak catch pan is not permitted because the pan is not __________.
  • What is a potential consequence of not using an air gap in plumbing systems?
  • Is evaluating water softeners and purifiers part of a typical home inspection?
  • What is the required minimum height for vent pipes that pass through a roof?
  • What can happen to old tailpieces and traps made of soft brass with chrome or nickel-plating?
  • Where should a sediment trap be installed in relation to the equipment's shut-off valve?
  • What does venting protect the trap seals from, besides positive pressures?
  • In plumbing standards, a toilet or commode is referred to as a what?
  • What is required for every trap and trap fixture in plumbing systems?
  • Is it ever permitted to discharge untreated sewage or wastewater on the ground surface?
  • If a standpipe is used for an automatic clothes washer, what should be the minimum diameter of the standpipe and its trap?
  • The term describing the reverse flow of liquids in a plumbing system is known as?
  • What is typically required for a shower installation in terms of space?
  • What does ABS stand for in plumbing terminology?
  • At what maximum temperature should a temperature pressure-relief (TPR) valve discharge?
  • Is a relief-valve pipe terminating into a water leak catch pan permitted?
  • Should inspectors identify whether the water supply to a property is public or private?
  • Which type of copper tubing is generally considered to be the strongest and most durable?
  • Which strategy can be employed to prevent water hammer in plumbing systems?
  • What material should hangers and strapping be made of?
  • Toilets generally have what type of plumbing feature?
  • Glass doors enclosing the shower must be made of what type of glazing?
  • Acrylonitrile butadiene styrene is commonly abbreviated as?
  • Gas vent pipes must terminate at least how high above roof pitches up to 6/12?
  • For safety measures, what type of window should be used in wet areas such as bathrooms?
  • What is the main focus of a plumbing inspection?
  • What type of damper is only to be used with a solid fuel-burning appliance?
  • What is required for the method of construction that allows drainage flow in plumbing?
  • The joint between different types of plastic made with solvent cement will not be reliable because the chemical composition of the joint will not ____________.
  • What is the maximum aggregate capacity of oil storage tanks to be permitted for a cross-connection?
  • What is a potential risk when using improper fittings in drainage systems?
  • The sump pit should not be less than ____ inches in diameter and ____ inches deep.
  • Why is solvent-cementing joints between different types of plastic not allowed?
  • What is the maximum total aggregate capacity of oil storage tanks allowed for cross-connection?
  • What should be the size of a vent pipe relative to the diameter of the drain it serves?
  • Inspectors are not required to determine the existence of _______________ plumbing in a home.
  • Why should inspectors pay special attention to the grade surrounding a foundation?
  • What type of window must be of safety glazing if the bottom exposed edge is less than 60 inches from the tub/shower floor?
  • Access should be provided to which type of valves in plumbing?
  • What is a common use of a vent stack in a plumbing system?
  • Which component should be included in the installation of a sump pump to ensure functionality?
  • Closet bolts are often made of which material due to its corrosion resistance?
  • What type of valve is required to prevent backflow in systems like sump pumps?
  • What action should inspectors avoid during a plumbing inspection?
  • Which material is no longer permitted for laundry trays due to sanitary concerns?
  • The design of a drainage system is based on _____ flow in the drainage piping.
  • A shutoff valve is _______ a full-open valve.
  • What is the purpose of a lavatory in a home?
  • An anchoring ring that is secured to the floor is known as what?
  • Where do gases escape in a sanitary drainage system?
  • How can a plumbing system ensure proper drainage?
  • Must the inspector determine the potability of the water supply?
  • What should be protected against freezing in cold climates?
  • What do air-admittance valves protect traps from?
  • Particular drainage fittings have been designed with patterns providing ________ resistance to flow.
  • Is a cleanout required for every change in direction of the sewer drainage pipe?
  • To which condition is safety glazing required for exterior windows?
  • Cleanouts for drainage pipes should be installed _____________ apart in horizontal drainage lines measured from the upstream entrance of the cleanout.
  • Dwellings built far above street-level may have what type of water pressure and water flow?
  • When inspecting toilets, what should inspectors check for?
  • What role does the TPR discharge pipe serve in relation to a water heater?
  • True or False: Inspectors are required to guarantee that shower pans and bath wastes are free of leaks.
  • What is required when a water heater is installed in an attic?
  • A _______ is required for most changes in direction of the sewer drainage pipe.
  • What is the minimum width required for a shower opening to be considered compliant?
  • If mechanical drain stoppers are missing or not working properly, how should inspectors report them?
  • What is the minimum clear and unobstructed finish-width for an access and egress opening for a shower?
  • What does not fall under the scope of plumbing inspections according to standard practices?
  • The horizontal spacing for supporting pipe made of cast iron should be a maximum of _____ feet.
  • What material are old tailpieces and traps often made of that can easily break with a gentle touch?
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