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.

Start practice testFlash cards
InterNACHI Plumbing Practice Exam course image
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?Tailpieces: The Short Pipe Directly Attached to a Fixture in PlumbingWhat are short lengths of pipe attached directly to a fixture called?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 fire-safe chemicals are used in plastic bathtubs to prevent ignition?What type of chemicals are used in the construction of plastic bathtubs to ensure fire safety?What safety access is required when a water heater is installed in an attic?What is required when a water heater is installed in an attic?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?Why vent pipes must extend above the roof and which terminations aren’t allowedWhich of the following is NOT an acceptable installation for vent pipes according to plumbing codes?
More practice questions

These questions are part of the practice quiz. Start practicing

  • What device is used to relieve excessive pressure within a water heater?
  • What is the minimum width required for a shower opening to be considered compliant?
  • What role does the TPR discharge pipe serve in relation to a water heater?
  • At what temperature, in degrees Fahrenheit, is the maximum water temperature typically limited to by a water temperature limiting device?
  • How many inches should casings for private wells extend above the ground surface?
  • What is the main focus of a plumbing inspection?
  • What can happen to old tailpieces and traps made of soft brass with chrome or nickel-plating?
  • What temperature is considered safe for water in bathtubs by regulations?
  • Where should a sediment trap be installed in relation to the equipment's shut-off valve?
  • How deep is a well categorized as a deep well?
  • 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 the required minimum height for vent pipes that pass through a roof?
  • This course addresses which aspects of plumbing?
  • Which type of traps is not permitted in plumbing?
  • Which material is no longer permitted for laundry trays due to sanitary concerns?
  • Is it ever permitted to discharge untreated sewage or wastewater on the ground surface?
  • What is the minimum slope of a horizontal drainpipe that is sized between 3 and 6 inches?
  • Particular drainage fittings have been designed with patterns providing ________ resistance to flow.
  • The waste from an automatic clothes washer must discharge its water through what type of device?
  • What should the installation of supply lines and fittings for all fixtures prevent?
  • The sump pit should not be less than ____ inches in diameter and ____ inches deep.
  • What does the term "plumbing" derive from in Latin?
  • What is required to be installed on a sump pump's discharge pipe to prevent backflow?
  • The U.S. EPA's Office of Drinking Water controls the quality of water classified as what?
  • What is a water closet commonly referred to as in plumbing standards?
  • Is an inspector required to light pilot lights during an inspection?
  • Which of the following is essential to maintain in a residential plumbing system?
  • Acrylonitrile butadiene styrene is commonly abbreviated as?
  • What is the minimum diameter typically required for a water service pipe?
  • What is another term for a bathroom or washroom sink?
  • What should be protected against freezing in cold climates?
  • What is the maximum horizontal spacing for PVC drainage pipe?
  • What does the term 'venting' primarily refer to in plumbing?
  • Is solvent-cementing between ABS and PVC pipe allowed?
  • What is a common characteristic of soft brass in plumbing?
  • What is the maximum total aggregate capacity of oil storage tanks allowed for cross-connection?
  • Why is evaluating water softeners significant during an inspection?
  • At what temperature must TPR valves be set to discharge at most?
  • If mechanical drain stoppers are missing or not working properly, how should inspectors report them?
  • What do air-admittance valves protect traps from?
  • What is the minimum diameter of a water service pipe?
  • Should the plumbing inspection report include the types of supply piping inspected?
  • From which areas may fuel-fired water heaters NOT obtain combustion air?
  • Should inspectors identify whether the water supply to a property is public or private?
  • What does ABS stand for in plumbing terminology?
  • Glass doors enclosing the shower must be made of what type of glazing?
  • 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.
  • The horizontal spacing for supporting pipe made of cast iron should be a maximum of _____ feet.
  • A plumbing inspection should always include which of the following actions regarding faucets?
  • What type of plumbing concern is polybutylene considered to be?
  • What is required when a water heater is installed in an attic?
  • What is the minimum drop in grade required within the first 10 feet to ensure proper drainage away from foundation walls?
  • Is a cleanout required for every change in direction of the sewer drainage pipe?
  • Are inspectors required to operate all plumbing and fuel shut-off valves during an inspection?
  • The DWV system of the dwelling should be tested with a minimum _______ head of water for ______.
  • What should any vent terminal be positioned in relation to an opening?
  • What is the common term for a lavatory?
  • When two or more vent connectors enter a common gas vent, which connector should enter at the highest level?
  • Which type of copper tubing is generally considered to be the strongest and most durable?
  • What material are old tailpieces and traps often made of that can easily break with a gentle touch?
  • Which valve is primarily used to control water flow in a plumbing system?
  • What is a critical factor in the placement of gas vent pipes?
  • Is a relief-valve pipe terminating into a water leak catch pan permitted?
  • What inessential characteristics of laundry trays are not allowed in construction?
  • How high should the termination for gas vent pipes be for roofs with a pitch of up to 6:12?
  • A relief-valve pipe terminating into a water leak catch pan is not permitted because the pan is not __________.
  • Is a shut-off valve the same as a full-open valve?
  • Is evaluating water softeners and purifiers part of a typical home inspection?
  • Must an inspector examine a home for polybutylene plumbing?
  • What does venting protect the trap seals from, besides positive pressures?
  • How should functional water flow be evaluated?
  • What is a potential risk when using improper fittings in drainage systems?
  • What is the lowest pipe in a drainage system called?
  • Inspectors are not required to determine the existence of _______________ plumbing in a home.
  • Where should the TPR discharge pipe discharge through?
  • According to standards, how should plumbing pipes be positioned relative to one another?
  • Where should the TPR discharge pipe be directed?
  • What is the minimum clear and unobstructed finish-width for an access and egress opening for a shower?
  • What should be done if a manual damper is found in a gas appliance setup?
  • A shutoff valve is _______ a full-open valve.
  • According to InterNACHI Standards, what are inspectors required to do with all toilets?
  • Is it true that rocks or blocks can support drainage piping inside a trench?
  • What component is critical in preventing siphonage in plumbing systems?
  • How far should a plumbing DWV vent termination be horizontally away from a door or window?
  • What is the minimum height for a clothes washer standpipe above the trap?
  • For safety measures, what type of window should be used in wet areas such as bathrooms?
  • Is a shut-off switch or disconnect required for all electric water heaters?
  • At what maximum temperature should a temperature pressure-relief (TPR) valve discharge?
  • What type of valve is required to prevent backflow in systems like sump pumps?
  • What is the acceptable installation practice for gas vent pipes?
  • What feature is essential for a cleanout in plumbing systems?
  • What should be the size of a vent pipe relative to the diameter of the drain it serves?
  • What is the minimum height above the tub floor surface for an exterior window to not require safety glazing?
  • What is the minimum height above the trap for a standpipe, such as that used for a clothes washer?
  • What type of window must be of safety glazing if the bottom exposed edge is less than 60 inches from the tub/shower floor?
  • True or False: All visible wastes, drains, and vents must be inspected by inspectors.
  • What is the purpose of a lavatory in a home?
  • What is required for the method of construction that allows drainage flow in plumbing?
  • What is the maximum aggregate capacity of oil storage tanks to be permitted for a cross-connection?
  • The joint between different types of plastic made with solvent cement will not be reliable because the chemical composition of the joint will not ____________.
  • Why should inspectors pay special attention to the grade surrounding a foundation?
  • Gas vent pipes must terminate at least how high above roof pitches up to 6/12?
  • What is required for every trap and trap fixture in plumbing systems?
  • A _______ is required for most changes in direction of the sewer drainage pipe.
  • Can contamination impact the potability of water?
  • What type of damper is only to be used with a solid fuel-burning appliance?
  • What is typically required for a shower installation in terms of space?
  • Where do gases escape in a sanitary drainage system?
  • To which condition is safety glazing required for exterior windows?
  • 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?
  • What type of vent pipes should have protection against freezing?
  • Which condition is vital for a plumbing vent to keep trap seals intact?
  • Access should be provided to which type of valves in plumbing?
  • An anchoring ring that is secured to the floor is known as what?
  • What is a common use of a vent stack in a plumbing system?
  • What is the maximum horizontal spacing for supporting cast-iron pipe?
  • What does a check valve do in a plumbing system?
  • The design of a drainage system is based on _____ flow in the drainage piping.
  • Which type of traps are NOT permitted as they impede drainage flow?
  • Which component should be included in the installation of a sump pump to ensure functionality?
  • How should an access opening for mechanical equipment, such as a water heater, be designed?
  • In plumbing standards, a toilet or commode is referred to as a what?
  • What is the minimum slope required for a horizontal drain pipe sized between 3 and 6 inches?
  • What must inspectors determine regarding main water and fuel shut-off valves?
  • Which strategy can be employed to prevent water hammer in plumbing systems?
  • Closet bolts are often made of which material due to its corrosion resistance?
  • What is the minimum interior cross-sectional area required for a shower compartment?
  • True or False: Inspectors should flush all toilets as part of their inspection process.
  • When inspecting toilets, what should inspectors check for?
  • What is the maximum height of the liquid seal in fixture traps, except for specially-designed fixtures?
  • How can a plumbing system ensure proper drainage?
  • True or False: Many old tailpieces and traps are made of durable materials.
  • How should an access opening for a whirlpool bathtub be sized if the pump is more than 2 feet away?
  • How far must the building drain extend beyond the exterior building walls?
  • The term describing the reverse flow of liquids in a plumbing system is known as?
  • If a home inspector sees a fuel storage tank, how should it be treated in the report?
  • If a standpipe is used for an automatic clothes washer, what should be the minimum diameter of the standpipe and its trap?
  • Toilets generally have what type of plumbing feature?
  • Dwellings built far above street-level may have what type of water pressure and water flow?
  • Must the inspector determine the potability of the water supply?
  • True or False: Inspectors are required to guarantee that shower pans and bath wastes are free of leaks.
  • Cleanouts for drainage pipes should be installed _____________ apart in horizontal drainage lines measured from the upstream entrance of the cleanout.
  • What material should hangers and strapping be made of?
  • What does not fall under the scope of plumbing inspections according to standard practices?
  • What is the primary purpose of a sediment trap in plumbing systems?
  • Which organization controls the quality requirements for water to be classified as potable in the U.S.?
  • What factor is critical for the installation of vent pipes?
  • What should inspectors verify about faucets in a plumbing inspection?
  • Obstructions, such as rocks or blocks, at any point inside a trench ________ provide adequate support for drainage piping.
  • What is a potential consequence of not using an air gap in plumbing systems?
  • Determining the location of the main water supply shut-off valve is considered?
  • Why is solvent-cementing joints between different types of plastic not allowed?
  • Are sump pumps included in the standard items for a home inspection?
  • In plumbing practices, what is the purpose of a water closet?
  • What action should inspectors avoid during a plumbing inspection?
  • A cleanout plug or removable trap section should be installed on traps located below which of the following?
  • Which type of vent connector configuration is generally more efficient for gas appliances?
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy