3e451 Volume 3 Plumbing Systems

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  • 1/124 Questions

    (430) What are the two classes of drainage piping?

    • Soil and waste
    • Soil and plastic
    • Plastic and steel
    • Steel and waste
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3e451 Volume 3 Plumbing Systems - Quiz
About This Quiz

This quiz titled '3E451 Volume 3 Plumbing Systems' assesses knowledge in plumbing systems within military technical training. It covers copper tubing, pipe fittings, and measurement tools relevant to the Air Force training, focusing on practical skills and theoretical understanding.

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  • 2. 

    (404) Convert 7 feet to inches.

    • 60 inches

    • 72 inches

    • 84 inches

    • 96 inches

    Correct Answer
    A. 84 inches
    Explanation
    To convert feet to inches, you need to multiply the number of feet by 12 since there are 12 inches in 1 foot. In this case, multiplying 7 feet by 12 gives us 84 inches.

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  • 3. 

    (427) What type of drainage system collects water from rain and melting snow?

    • Main sewer

    • Storm sewer

    • Industrial sewer

    • Interceptor sewer

    Correct Answer
    A. Storm sewer
    Explanation
    A storm sewer is a type of drainage system that collects water from rain and melting snow. It is designed to prevent flooding by diverting the excess water away from streets and buildings. Storm sewers typically consist of a network of underground pipes and drains that carry the water to nearby bodies of water, such as rivers or lakes. This helps to prevent water accumulation on the surface and reduces the risk of damage to infrastructure and property caused by heavy rainfall or snowmelt.

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  • 4. 

    (431) In a building drainage system, what is the definition of a stack?

    • Vertical pipe of a system of soil, waste, or vent piping that extends through one or more stories

    • Horizontal pipe of a system of soil, waste, or vent piping that extends through one or more stories

    • Main artery of the venting system to which vent branches may be connected used primarily in multistory buildings

    • Pipe that is installed to vent a single fixture trap and which connects with the vent system above the fixture served or terminates in the open air

    Correct Answer
    A. Vertical pipe of a system of soil, waste, or vent piping that extends through one or more stories
    Explanation
    A stack in a building drainage system refers to a vertical pipe that is part of a system of soil, waste, or vent piping. It extends through one or more stories of the building, allowing for the proper disposal of waste and ventilation. This definition distinguishes a stack from a horizontal pipe, which is also part of the system but runs parallel to the ground. The stack serves as the main artery of the venting system, to which vent branches can be connected, making it particularly important in multistory buildings.

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  • 5. 

    (402) What fitting joins pipes so they can be taken apart later?

    • Union

    • Nipple

    • Adapter

    • Coupling

    Correct Answer
    A. Union
    Explanation
    A union fitting is used to join pipes in a way that allows them to be easily taken apart later. It consists of two threaded ends that can be screwed onto separate pipes, and a central nut that can be tightened to create a secure connection. When the pipes need to be separated, the nut can be loosened, allowing the pipes to be easily disconnected.

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  • 6. 

    (431) How does a soil stack differ from a waste stack?

    • A soil stack is horizontal piping; whereas, a waste stack is vertical piping

    • A soul stack is vertical piping; whereas, a waste stack is horizontal piping

    • A soil stack carries the human fecal discharge of water closets, urinals, or other similar fixtures to the building drain; whereas, a waste stack carries waste that is free of fecal matter from all fixtures

    • A waste stack carries the human fecal discharge of water closets, urinals, or other similar fixtures to the building drain; whereas, a soil stack carries waste that is free of fecal matter from all fixtures

    Correct Answer
    A. A soil stack carries the human fecal discharge of water closets, urinals, or other similar fixtures to the building drain; whereas, a waste stack carries waste that is free of fecal matter from all fixtures
    Explanation
    A soil stack and a waste stack differ in their function and the type of waste they carry. A soil stack carries the human fecal discharge from water closets, urinals, or similar fixtures to the building drain. On the other hand, a waste stack carries waste that is free of fecal matter from all fixtures. The key difference is that a soil stack specifically deals with waste that contains fecal matter, while a waste stack deals with non-fecal waste.

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  • 7. 

    (432) How do you repair a leak on a plastic pipe fitting?

    • Duct tape around fitting

    • Apply glue around fitting

    • Apply primer around fitting

    • Cut fitting out and install new fitting

    Correct Answer
    A. Cut fitting out and install new fitting
    Explanation
    To repair a leak on a plastic pipe fitting, the best solution is to cut out the faulty fitting and replace it with a new one. This ensures a proper and secure connection, eliminating the possibility of future leaks. Duct tape may provide a temporary fix, but it is not a long-term solution and may not hold up well under pressure. Applying glue or primer around the fitting may not effectively fix the leak and could cause further damage to the pipe.

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  • 8. 

    (441) What is installed on fixtures to keep sewer gases from entering the building?

    • Valves

    • Faucets

    • Vents

    • Traps

    Correct Answer
    A. Traps
    Explanation
    Traps are installed on fixtures to keep sewer gases from entering the building. Traps are U-shaped pipes that hold a small amount of water, creating a barrier that prevents the gases from flowing back into the building. When water flows down the drain, it creates a seal in the trap, allowing wastewater to pass through while blocking the gases. This helps to maintain a healthy and odor-free environment inside the building.

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  • 9. 

    (409) When threading a fitting on a pipe, what happens if you overtighten a fitting?

    • Leaks will be stopped completely

    • The wrench you are using might break

    • Overall pipe length decreases by 1 inch

    • The fitting stretches and the joint leaks

    Correct Answer
    A. The fitting stretches and the joint leaks
    Explanation
    When a fitting is overtightened on a pipe, it causes the fitting to stretch. This stretching can result in the joint becoming loose and causing leaks. Therefore, overtightening a fitting can lead to the fitting stretching and the joint leaking.

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  • 10. 

    (418) What device do you install in a building distribution system to correct a water hammer problem?

    • Vertical air chamber

    • Horizontal air chamber

    • Vertical expansion fitting

    • Horizontal expansion fitting

    Correct Answer
    A. Vertical air chamber
    Explanation
    A water hammer problem occurs when there is a sudden change in water flow, causing a pressure surge that can damage pipes and fixtures. To correct this issue, a vertical air chamber is installed in the building distribution system. This device acts as a cushion, absorbing the pressure surge and preventing the water hammer effect. By allowing air to compress and expand within the chamber, it helps to stabilize the water flow and protect the system from potential damage. Horizontal air chambers, vertical expansion fittings, and horizontal expansion fittings are not specifically designed to address water hammer problems.

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  • 11. 

    (433) What should you do if an oxygen-deficient condition is present in a manhole?

    • Enter it

    • Call the fire department

    • Get and oxygen cylinder from base supply

    • Ventilate it or use a self-contained breathing apparatus

    Correct Answer
    A. Ventilate it or use a self-contained breathing apparatus
    Explanation
    If an oxygen-deficient condition is present in a manhole, it means that the oxygen levels are too low to support human life. In such a situation, it is important to either ventilate the area to increase the oxygen levels or use a self-contained breathing apparatus (SCBA) to provide a safe supply of oxygen for the person entering the manhole. Ventilating the area involves introducing fresh air into the manhole to replace the oxygen-deficient air. Using an SCBA allows the person to carry their own supply of breathable air, ensuring their safety in the oxygen-deficient environment.

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  • 12. 

    (401) Galvanization provides a pipe with what benefit?

    • Makes the pipe easier to bend

    • Increases pipe thickness

    • Increases pipe strength

    • Reduces corrosion

    Correct Answer
    A. Reduces corrosion
    Explanation
    Galvanization is a process in which a protective zinc coating is applied to the surface of a metal, in this case, a pipe. This coating acts as a barrier between the pipe and the surrounding environment, preventing corrosion. Therefore, the correct answer is that galvanization reduces corrosion.

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  • 13. 

    (401) What wall thicknesses are available in copper tubing for drinking water?

    • A, B, C, D

    • N, O, P, DWV

    • K, L, M, DWV

    • Schedule 40 and 80

    Correct Answer
    A. K, L, M, DWV
    Explanation
    The wall thicknesses available in copper tubing for drinking water are K, L, M, and DWV.

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  • 14. 

    (417) After you have taken all the hydrant readings, you should shut down the hydrants slowly to?

    • Decrease flushing time

    • Prevent surges in pressure

    • Increase flushing time

    • Increase the pressure throughout the system

    Correct Answer
    A. Prevent surges in pressure
    Explanation
    Shutting down the hydrants slowly after taking all the readings helps prevent surges in pressure. Abruptly closing the hydrants can cause a sudden change in pressure, leading to surges that can damage the system or cause water hammer. By closing the hydrants slowly, the pressure is gradually equalized, preventing any sudden changes and maintaining the stability of the system.

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  • 15. 

    (402) How do street elbows and standard elbows differ?

    • Standard elbows have male threads

    • Street elbows have recessed threads

    • Standard elbows have tapered threads

    • Street elbows have one female and one male end

    Correct Answer
    A. Street elbows have one female and one male end
    Explanation
    Street elbows and standard elbows differ in terms of their connection ends. Street elbows have one female and one male end, which means one end has a threaded opening to connect to a pipe, while the other end has a threaded protrusion to connect to another fitting or pipe. On the other hand, standard elbows typically have male threads on both ends, allowing them to be connected directly to pipes or fittings with female threads. This key difference in connection ends makes street elbows and standard elbows distinct from each other.

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  • 16. 

    (408) What is the purpose of oiling while threading the steel pipe?

    • Allows the pipe dies to turn freely inside the die holder

    • Prevents the dies and threads from overheating and becoming damaged

    • The oil penetrates the pipe walls, slows down the corrosion process, and allows increased pipe life

    • The oil maintains a thin protective coating on the pipe and prevents flying debris from injuring the user

    Correct Answer
    A. Prevents the dies and threads from overheating and becoming damaged
    Explanation
    Oiling while threading the steel pipe prevents the dies and threads from overheating and becoming damaged. This is because the oil acts as a lubricant, reducing friction and heat generated during the threading process. Without oiling, the high heat and friction can cause the dies and threads to overheat, leading to damage and potentially rendering the pipe unusable. Therefore, oiling is necessary to ensure the proper functioning and longevity of the threading process.

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  • 17. 

    (411) What action creates an watertight and airtight seal on a ferruled joint?

    • Tighten the nut which crimps the ferrule into the tubing and against the fitting

    • The capillary action between the components

    • Squeezing the ferrule into the nut

    • The compression of the tapered threads

    Correct Answer
    A. Tighten the nut which crimps the ferrule into the tubing and against the fitting
    Explanation
    Tightening the nut crimps the ferrule into the tubing and against the fitting, creating a watertight and airtight seal. This action ensures that there are no gaps or leaks in the joint, preventing the escape of water or air. The pressure applied by tightening the nut helps to secure the ferrule tightly around the tubing, ensuring a secure and sealed connection.

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  • 18. 

    (412) When solvent welding plastic pipe, how do you insert the pipe into the fitting?

    • Put the pipe halfway into the fitting to allow for expansion and contraction

    • Quickly insert the pipe into the fitting with a one-quarter turning motion

    • Insert the pipe into the fitting and give the pipe a full turn

    • Thread the pipe into the fitting until no threads show

    Correct Answer
    A. Quickly insert the pipe into the fitting with a one-quarter turning motion
    Explanation
    When solvent welding plastic pipe, it is recommended to quickly insert the pipe into the fitting with a one-quarter turning motion. This is because the solvent used in the welding process has a fast-drying time, and by quickly inserting the pipe with a turning motion, it ensures that the solvent is evenly distributed and creates a strong bond between the pipe and fitting. This method also helps to prevent any excess solvent from dripping out and causing a messy joint.

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  • 19. 

    (430) Which type of drainage piping only conveys liquids that are free of fecal matter?

    • Soil

    • Waste

    • Vent

    • Traps

    Correct Answer
    A. Waste
    Explanation
    Waste drainage piping is specifically designed to carry only liquid waste that does not contain fecal matter. This type of piping is used to transport wastewater from sinks, showers, and other non-toilet fixtures. It is separate from the soil piping, which is responsible for carrying sewage and fecal matter from toilets. Vent piping is used to provide ventilation and prevent the build-up of gases in the drainage system. Traps are plumbing devices that are installed in drain pipes to prevent the backflow of sewer gases into the building.

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  • 20. 

    (410) What preparation must you make to produce a good bond between the base metal and the solder in a copper soldered joint?

    • The solder must be lead free

    • The pipe must be reamed and cut

    • The solder must be 95/5 solder

    • The metal surfaces must be perfectly clean at the joint

    Correct Answer
    A. The metal surfaces must be perfectly clean at the joint
    Explanation
    To produce a good bond between the base metal and the solder in a copper soldered joint, it is essential that the metal surfaces are perfectly clean at the joint. This is because any dirt, oxidation, or other contaminants on the metal surfaces can prevent the solder from properly adhering to the base metal. By ensuring that the surfaces are clean, the solder can effectively flow and bond with the base metal, creating a strong and reliable joint.

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  • 21. 

    (440) What type of sink is used for dumping mop buckets and washing mops?

    • Service sinks

    • Scullery sinks

    • Kitchen sinks

    • Countertop sinks

    Correct Answer
    A. Service sinks
    Explanation
    Service sinks are used for dumping mop buckets and washing mops. These sinks are specifically designed for heavy-duty cleaning tasks and are typically found in commercial or industrial settings. They are larger and more durable than regular kitchen sinks, allowing for easy disposal of dirty water and efficient cleaning of mops. Scullery sinks are used for dishwashing, kitchen sinks are used for regular kitchen tasks, and countertop sinks are small sinks placed on countertops for convenience.

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  • 22. 

    (445) How do you repair a water closets leaking flapper?

    • Replace chain

    • Replace flapper

    • Adjust rod guides

    • Lightly sand with emery cloth

    Correct Answer
    A. Replace flapper
    Explanation
    To repair a water closet's leaking flapper, you need to replace the flapper. The flapper is a rubber valve that controls the flow of water from the tank to the bowl. If it is damaged or worn out, it can cause leaks. By replacing the flapper, you ensure that it forms a tight seal and prevents any water from leaking out of the tank.

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  • 23. 

    (406) An end-to-center measurement is made from the?

    • Middle of the pipe to end of fitting

    • End of pipe to center of fitting

    • Center of pipe to end of fitting

    • End of face to center of back

    Correct Answer
    A. End of pipe to center of fitting
    Explanation
    An end-to-center measurement is made from the end of the pipe to the center of the fitting. This means that the measurement starts at the end of the pipe and extends to the center of the fitting, which is the point where the pipe and fitting are aligned. This type of measurement is commonly used in construction and plumbing to ensure proper alignment and fitting of pipes.

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  • 24. 

    (407) When cutting tubing with a tubing cutter, how far do you turn the handle after each revolution?

    • 1/8 turn

    • 1/4 turn

    • 1/2 turn

    • 1 full turn

    Correct Answer
    A. 1/4 turn
    Explanation
    When cutting tubing with a tubing cutter, it is recommended to turn the handle 1/4 turn after each revolution. This allows for a gradual and controlled cutting process, ensuring that the tubing is cut smoothly and accurately. Turning the handle 1/4 turn helps to maintain a consistent cutting speed and prevents any potential damage or uneven cuts to the tubing.

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  • 25. 

    (425) When installing a compression coupling, why do you dig out the area to give you as much flexibility with the pipe?

    • To allow for easy installation

    • To check if the pipe has shifted

    • To check if the water is shut-off

    • To look for the cause of the break

    Correct Answer
    A. To allow for easy installation
    Explanation
    Digging out the area around the pipe when installing a compression coupling allows for easy installation because it provides more flexibility with the pipe. This extra space allows the installer to maneuver the pipe and coupling more easily, making it simpler to connect and secure them together. It also helps to ensure that the coupling is properly aligned with the pipe, reducing the risk of leaks or damage during installation.

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  • 26. 

    (403) What is the smallest increment on most of the tape measures in our trade?

    • Sixty-fourth inch

    • Thirty-second inch

    • Sixteenth inch

    • Eighth inch

    Correct Answer
    A. Sixteenth inch
    Explanation
    The correct answer is "Sixteenth inch." Tape measures in the trade typically have markings in fractions of an inch, with the smallest increment being a sixteenth of an inch. This means that each inch on the tape measure is divided into 16 equal parts, allowing for precise measurements in small increments.

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  • 27. 

    (403) What is the next largest sixteenth-inch mark after 3/4?

    • 15/16ths

    • 13/16ths

    • 10/16ths

    • 9/16ths

    Correct Answer
    A. 13/16ths
    Explanation
    The next largest sixteenth-inch mark after 3/4 is 13/16ths. This can be determined by understanding that each inch is divided into 16 equal parts in a sixteenth-inch measurement. Starting from 0/16ths, 1/16th, 2/16ths (which simplifies to 1/8th), 3/16ths, and so on, we can see that the next largest sixteenth-inch mark after 3/4 (which is equivalent to 12/16ths) is 13/16ths.

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  • 28. 

    (413) What is the reason we use elevated storage tanks in water systems?

    • Because of emergency water requirements

    • Elevated storage tanks provide cheap pressure

    • Ground tanks are for firefighting purposes only

    • Elevated tanks last longer than ground storage tanks

    Correct Answer
    A. Elevated storage tanks provide cheap pressure
    Explanation
    Elevated storage tanks provide cheap pressure in water systems because they utilize the force of gravity to deliver water to lower areas. By placing the tanks at a higher elevation, the water can flow down naturally without the need for additional pumps or energy. This helps to reduce the cost of maintaining and operating the water system, making it a more affordable option. Additionally, elevated storage tanks can also provide a consistent and reliable water supply during emergencies or power outages, ensuring that there is always water available for essential needs.

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  • 29. 

    (421) Who must be notified anytime a water main is turned off?

    • Base operations

    • Command post

    • Service call desk

    • Fire department

    Correct Answer
    A. Fire department
    Explanation
    The fire department must be notified anytime a water main is turned off because they rely on a steady supply of water to effectively respond to emergencies. In the event of a fire, they need access to water for extinguishing the flames and protecting lives and property. Therefore, it is crucial to inform the fire department when a water main is shut off so they can make any necessary adjustments to their response plans and ensure they have alternative water sources available if needed.

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  • 30. 

    (439) The tub overflow and drain assembly is not included in the rough-in piping for a bathtub because it is attached directly to the?

    • Tub at the time the tub is set

    • Vent at the time the tub is set

    • Diverter at the time the tub is set

    • Shower arm at the time the tub is set

    Correct Answer
    A. Tub at the time the tub is set
    Explanation
    The tub overflow and drain assembly is not included in the rough-in piping for a bathtub because it is attached directly to the tub at the time the tub is set. This means that the overflow and drain assembly is installed onto the tub itself, rather than being part of the initial rough-in plumbing. This allows for easier installation and maintenance of the assembly, as it can be accessed directly through the tub rather than through the rough-in piping.

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  • 31. 

    (423) When winterizing a system, what is the first step in draining a water system?

    • Disconnect the unions

    • Close the main shutoff valve

    • Open the highest level faucets

    • Loosen at the lowest connection

    Correct Answer
    A. Close the main shutoff valve
    Explanation
    The first step in draining a water system when winterizing is to close the main shutoff valve. This is important because it will stop the flow of water into the system, preventing any further water from entering and potentially causing damage during the winter months. By closing the main shutoff valve, it ensures that the water system is isolated and ready to be drained.

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  • 32. 

    (428) What is the desired fall for a 3-inch house sewer?

    • 1/8 inch per foot

    • 1/4 inch per foot

    • 1/2 inch per foot

    • 1 1/16 inch per foot

    Correct Answer
    A. 1/4 inch per foot
    Explanation
    The desired fall for a 3-inch house sewer is 1/4 inch per foot. This means that for every foot of horizontal distance, the sewer pipe should slope downward by 1/4 inch to ensure proper drainage and flow of wastewater. This slope helps to prevent the accumulation of waste and debris in the pipe, reducing the risk of clogs and backups.

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  • 33. 

    (449) The anode rod is installed in the top of water heaters to prevent corrosion?

    • Inside the tank

    • Outside the tank

    • Of the hot water supply

    • Of the cold water supply

    Correct Answer
    A. Inside the tank
    Explanation
    The anode rod is installed inside the tank of water heaters to prevent corrosion. It is made of a material that is more reactive than the metal of the tank, such as magnesium or aluminum. This means that the anode rod will corrode first, sacrificing itself to protect the tank from rust and corrosion. By attracting the corrosive elements in the water, the anode rod helps to extend the lifespan of the water heater and maintain its efficiency.

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  • 34. 

    (410) How much solder is needed to solder a 1/2 inch connection

    • 1/2 inch

    • 3/4 inch

    • 7/8 inch

    • 1 inch

    Correct Answer
    A. 1/2 inch
    Explanation
    The correct answer is 1/2 inch because to solder a 1/2 inch connection, you would need a length of solder that matches the size of the connection. In this case, the connection is 1/2 inch, so you would need 1/2 inch of solder to properly solder it.

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  • 35. 

    (417) What is the normal operating pressure of a water distribution system?

    • 5 to 10 pounds per square inch

    • 10 to 20 pounds per square inch

    • 40 to 75 pounds per square inch

    • 100 to 200 pounds per square inch

    Correct Answer
    A. 40 to 75 pounds per square inch
    Explanation
    The normal operating pressure of a water distribution system is typically between 40 to 75 pounds per square inch. This range of pressure ensures that water can flow effectively through the system and reach all intended destinations. Pressure below this range may result in insufficient water flow, while pressure above this range can cause damage to pipes and fixtures.

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  • 36. 

    (428) The proper fall for a house sewer is established by?

    • Using proper backfilling procedures

    • Installing the proper shoring in the trench

    • Establishing a grade line then digging the trench to exactly this line

    • Joining the pipe aboveground before you lower it into the excavation and backfill

    Correct Answer
    A. Establishing a grade line then digging the trench to exactly this line
    Explanation
    The proper fall for a house sewer is established by establishing a grade line and then digging the trench to exactly this line. This means that a specific slope is determined for the sewer line, ensuring that it has the appropriate gradient for efficient flow of wastewater. By digging the trench to this line, the sewer pipe will be installed at the correct depth and angle, allowing for proper drainage. This method ensures that the sewer system functions effectively and prevents any potential issues with clogging or backup.

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  • 37. 

    (433) What are the primary means of inspecting and maintaining the sewer system?

    • Cleanout

    • Manholes

    • Sewer snakes

    • Power rodders

    Correct Answer
    A. Manholes
    Explanation
    Manholes are the primary means of inspecting and maintaining the sewer system. Manholes provide access to the underground sewer pipes, allowing workers to enter and inspect the system for any blockages, leaks, or damages. They also serve as access points for cleaning and maintenance activities such as removing debris, sediment, or tree roots. Manholes are essential for regular inspections and maintenance to ensure the proper functioning and longevity of the sewer system.

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  • 38. 

    (435) What propels the nozzle of a jet rodder throughout the length of a sewer line?

    • Hydraulic lever

    • Hose reel assembly

    • Clockwise action of the drum

    • Reverse jet action of the nozzle

    Correct Answer
    A. Reverse jet action of the nozzle
    Explanation
    The reverse jet action of the nozzle propels the nozzle of a jet rodder throughout the length of a sewer line. This means that the water is expelled from the nozzle in a backward direction, creating a force that pushes the nozzle forward. This action allows the jet rodder to effectively clean and clear the sewer line by pushing through any blockages or debris in its path.

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  • 39. 

    (436) What is the name of the special tool designed to reach the hex jamnut beneath a fixture?

    • Pipe wrench

    • Box wrench

    • Basin wrench

    • Adjustable wrench

    Correct Answer
    A. Basin wrench
    Explanation
    A basin wrench is a special tool designed specifically for reaching and tightening or loosening hex jamnuts that are located beneath a fixture, such as a sink or toilet. It has a long handle with a pivoting jaw at the end, allowing it to fit into tight spaces and grip the nut securely. The other options, pipe wrench, box wrench, and adjustable wrench, are not specifically designed for reaching hex jamnuts beneath fixtures.

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  • 40. 

    (406) How do you determine the center of a fitting?

    • By reading the branch, then the run

    • By determining the angle of the branch

    • By dividing the length of the fitting by 2

    • By finding where lines drawn through the fitting intersect

    Correct Answer
    A. By finding where lines drawn through the fitting intersect
    Explanation
    To determine the center of a fitting, you need to find where lines drawn through the fitting intersect. This means that you would draw lines through the fitting in different directions and find the point where these lines meet. This intersection point represents the center of the fitting. By locating this point, you can accurately position and align the fitting as needed.

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  • 41. 

    (418) To solder copper joints in a water distribution piping, you must not use solder containing?

    • Less than 0.2 percent lead

    • More than 0.2 percent lead

    • Less than 0.2 percent antimony

    • More than 0.2 percent antimony

    Correct Answer
    A. More than 0.2 percent lead
    Explanation
    When soldering copper joints in water distribution piping, it is important not to use solder containing more than 0.2 percent lead. This is because lead can leach into the water and contaminate it, posing a health risk to those who consume the water. Therefore, solder with a lead content higher than 0.2 percent should be avoided to ensure the safety and quality of the water supply.

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  • 42. 

    (427) What may happen if a sewer pipe is laid with a fall greater than 1/4 inch per foot

    • Reduction in pipe size is required to slow sewage

    • The greater the fall, the better the operation of the sewer

    • Sewage flow is slowed, causing sewage to settle in low spots

    • Waste water runs away from solids, eventually causing stoppages

    Correct Answer
    A. Waste water runs away from solids, eventually causing stoppages
    Explanation
    If a sewer pipe is laid with a fall greater than 1/4 inch per foot, waste water will run away from solids. This means that the sewage will not be able to carry the solids along with it, causing them to settle in low spots of the pipe. Over time, this buildup of solids can lead to blockages and stoppages in the sewer system.

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  • 43. 

    (405) What kind of tape measurer can you use to determine the travel when the offset angle is known to be 45 degrees?

    • Angle rule

    • Travel rule

    • Standard rule

    • Plumber's rule

    Correct Answer
    A. Plumber's rule
    Explanation
    A plumber's rule is a type of tape measurer that is specifically designed for measuring distances and angles in plumbing applications. It is commonly used to determine the travel distance when the offset angle is known to be 45 degrees. This type of rule typically has markings and features that allow for accurate measurements and calculations in plumbing tasks.

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  • 44. 

    (415) Before a new water main is put into service it must be?

    • Cured and tested

    • Tested and leveled

    • Leveled and disinfected

    • Tested and disinfected

    Correct Answer
    A. Tested and disinfected
    Explanation
    Before a new water main is put into service, it must be tested to ensure that it meets the required standards and is free from any defects or leaks. This is important to ensure the safety and quality of the water supply. Additionally, the water main must be disinfected to eliminate any potential bacteria or contaminants that may be present. This is done to protect public health and ensure that the water is safe for consumption. Therefore, the correct answer is "Tested and disinfected."

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  • 45. 

    (417) Which instrument is used to measure velocity flow from a fire hydrant?

    • Pitot tube

    • Vacuum gauge

    • Pressure gauge

    • Hydrant gauge assembly

    Correct Answer
    A. Pitot tube
    Explanation
    A Pitot tube is used to measure the velocity flow from a fire hydrant. It is a device that has a tube with an opening facing the flow of water. The water enters the tube, creating a pressure difference between the static pressure and the dynamic pressure. By measuring this pressure difference, the velocity of the water flow can be determined. This makes the Pitot tube an ideal instrument for measuring the velocity flow from a fire hydrant.

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  • 46. 

    (428) in constructing a sewer main, when should you backfill the trench?

    • As soon as you install the pipe

    • After you inspect the sewer pipe

    • As soon as the pipe has settled and shifted

    • After you remove all debris from the sewer pipe

    Correct Answer
    A. After you inspect the sewer pipe
    Explanation
    After you inspect the sewer pipe, it is recommended to backfill the trench. This is because inspecting the sewer pipe ensures that it has been installed correctly and there are no issues or damages. Backfilling the trench after inspection helps to prevent any further damage to the pipe during the backfilling process. It also ensures that the pipe is secure and stable before filling the trench with soil or other materials.

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  • 47. 

    (442) What does continuous dripping of a single or mixing faucet indicate?

    • Bad washer

    • Damaged handle

    • Low water pressure

    • Angle stop leaking

    Correct Answer
    A. Bad washer
    Explanation
    Continuous dripping of a faucet indicates a bad washer. A washer is a small rubber or silicone seal that is located inside the faucet and helps to create a watertight seal when the faucet is closed. Over time, the washer can become worn or damaged, causing water to leak out of the faucet even when it is turned off. This constant dripping is a clear indication that the washer needs to be replaced in order to stop the leak.

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  • 48. 

    (415) What is the part of the water distribution system that originates at the street main and extends into the building?

    • Water mains

    • Distribution mains

    • Water service lines

    • Lateral water mains

    Correct Answer
    A. Water service lines
    Explanation
    Water service lines are the part of the water distribution system that originates at the street main and extends into the building. These lines connect the building to the water main and are responsible for delivering water from the main to the individual building. They are typically smaller in diameter compared to the distribution mains and are responsible for supplying water to individual properties.

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  • 49. 

    Plastic pipe and tubing must be supported evert?

    • 4 feet

    • 6 feet

    • 8 feet

    • 10 feet

    Correct Answer
    A. 4 feet
    Explanation
    Plastic pipe and tubing must be supported every 4 feet to ensure proper stability and prevent sagging or damage. Proper support is necessary to maintain the integrity of the pipe or tubing and prevent any potential leaks or breakages. By providing support at regular intervals, the weight of the pipe or tubing is evenly distributed, reducing the risk of any structural issues.

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Quiz Review Timeline (Updated): Mar 21, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 27, 2013
    Quiz Created by
    Pggomoljak328

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