Master Plumber Pre-board Exam Part 2

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Master Plumber Pre-board Exam Part 2 - Quiz


Questions and Answers
  • 1. 

    Which of the following does not directly affect the size of a sanitary drainage pipe?

    • A.

      Type and number of fixtures

    • B.

      Fixture unit value of fixtures

    • C.

      Type of ventilation system

    • D.

      Slope of drain

    Correct Answer
    C. Type of ventilation system
    Explanation
    The type of ventilation system does not directly affect the size of a sanitary drainage pipe. The size of the pipe is determined by factors such as the type and number of fixtures, the fixture unit value of fixtures, and the slope of the drain. The ventilation system is responsible for removing odors and gases from the drainage system, but it does not impact the physical size of the pipe itself.

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  • 2. 

    To boost the water pressure of hot water, use

    • A.

      Elevated water tank

    • B.

      Hydroelectric tank

    • C.

      Gravity tank

    • D.

      Circulating pump

    Correct Answer
    D. Circulating pump
    Explanation
    A circulating pump is used to boost the water pressure of hot water. Unlike the other options, a circulating pump actively circulates the water, creating a continuous flow and increasing the pressure. This is especially useful in situations where the hot water needs to be distributed to multiple areas or floors, as it ensures a consistent and adequate water pressure throughout the system.

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  • 3. 

    A tool used to make watertight joints between flexible copper tubing and fitting or valve.

    • A.

      Flaring tool

    • B.

      Pipe vise

    • C.

      Yoke vise

    • D.

      Pipe extractor

    Correct Answer
    A. Flaring tool
    Explanation
    A flaring tool is used to create watertight joints between flexible copper tubing and fittings or valves. This tool is specifically designed to flare the end of the tubing, creating a wider opening that can be connected securely to the fitting or valve. The flaring process ensures a tight seal, preventing any leaks or water damage.

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  • 4. 

    A term used to describe the installation of pipes, fittings, devices or other component parts of the plumbing system which can be completed prior to the installation of fixtures or finishing.

    • A.

      Pipelaying

    • B.

      Plumbing assembly

    • C.

      Roughing in

    • D.

      Mock up installation

    Correct Answer
    C. Roughing in
    Explanation
    Roughing in refers to the process of installing pipes, fittings, devices, or other components of a plumbing system before the fixtures or finishing touches are added. This allows for the necessary infrastructure to be put in place, such as water supply lines, drainage systems, and connections for fixtures like sinks, toilets, and showers. It is an essential step in the plumbing installation process, ensuring that all necessary components are properly positioned and connected before the final fixtures are added.

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  • 5. 

    The following are examples of sanitary wares EXCEPT __________.

    • A.

      Kitchen sink

    • B.

      Bathtub

    • C.

      Urinal

    • D.

      Water closet

    Correct Answer
    A. Kitchen sink
    Explanation
    Sanitary wares refer to plumbing fixtures that are used for sanitation purposes. A kitchen sink is not considered a sanitary ware because it is primarily used for washing dishes and food preparation, rather than for personal hygiene or waste disposal. On the other hand, a bathtub, urinal, and water closet (toilet) are all examples of sanitary wares as they are designed for bathing, urination, and defecation respectively.

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  • 6. 

    What is the other word for plumber's friend?

    • A.

      Plumbing apprentice

    • B.

      Force cup

    • C.

      Journeyman

    • D.

      Pipe fitter

    Correct Answer
    B. Force cup
    Explanation
    A force cup is another word for a plumber's friend. A force cup is a tool used to unclog drains by creating suction and pushing air or water through the pipes to dislodge blockages. It is commonly used by plumbers to clear clogged toilets or sinks.

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  • 7. 

    Which among the plumbing practices is prohibited under the code?

    • A.

      Double trapping a fixture

    • B.

      Providing a vent pipe to a fixture

    • C.

      Using fittings to connect pipes instead of bending

    • D.

      Providing an air gap or air break between the outlet and the flood level rim of a fixture

    Correct Answer
    A. Double trapping a fixture
    Explanation
    Double trapping a fixture is prohibited under the plumbing code because it can cause water to become trapped in the pipes, leading to blockages and potential backups. This can result in inefficient drainage and potential health hazards. The code aims to ensure proper plumbing practices that promote the safe and effective flow of water and waste.

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  • 8. 

    Which plumbing principle is contrary to established principles as stipulated in the National Plumbing Code?

    • A.

      Water closet shall be located in a properly lighted and ventilated room

    • B.

      Plumbing system shall be maintained in a sanitary and serviceable condition

    • C.

      Vent terminal shall not extend above the roof

    • D.

      Fixture directly connected to the plumbing system shall be equipped with a water-sealed trap

    Correct Answer
    C. Vent terminal shall not extend above the roof
    Explanation
    The correct answer is "Vent terminal shall not extend above the roof". This is contrary to established principles in the National Plumbing Code because vent terminals are required to extend above the roof to ensure proper ventilation and prevent the buildup of harmful gases.

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  • 9. 

    A bidet is a plumbing fixture used for washing ______________.

    • A.

      Body

    • B.

      Face

    • C.

      External genitalia

    • D.

      Feet

    Correct Answer
    C. External genitalia
    Explanation
    A bidet is a plumbing fixture used for washing external genitalia. It is designed to provide a hygienic and efficient way to clean the genital area after using the toilet. Bidets typically have a spray nozzle or jet of water that can be adjusted to the desired pressure and temperature. By using a bidet, individuals can maintain cleanliness and freshness in this sensitive area, promoting good personal hygiene and reducing the risk of infections or discomfort.

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  • 10. 

    How many cubic inches are there in a cubic foot?

    • A.

      144 cu ins.

    • B.

      1235 cu ins.

    • C.

      1500 cu ins.

    • D.

      1728 cu ins.

    Correct Answer
    D. 1728 cu ins.
    Explanation
    A cubic foot is a unit of volume that measures the amount of space occupied by a cube with sides that are each one foot long. To find the number of cubic inches in a cubic foot, we need to determine the number of cubic inches that can fit in each dimension of the cube. Since there are 12 inches in a foot, we multiply 12 by itself three times (12 x 12 x 12) to get the total number of cubic inches in a cubic foot, which equals 1728 cubic inches.

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  • 11. 

    What do you call that portion of the drainage system which cannot drain by gravity into the building sewer? It requires the use of a sump pump installed in a sump pit where wastewater is collected and drained into the sewer line using a sump pump.

    • A.

      Building sewer

    • B.

      Building subdrain

    • C.

      Building drain

    • D.

      Subsoil drain

    Correct Answer
    B. Building subdrain
    Explanation
    A building subdrain refers to a portion of the drainage system that cannot drain by gravity into the building sewer. Instead, it requires the use of a sump pump installed in a sump pit. The wastewater is collected in the sump pit and then drained into the sewer line using the sump pump.

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  • 12. 

    All plumbing fixtures listed below are included under the definition of a plumbing unit except ______________.

    • A.

      Water meter

    • B.

      Lavatory

    • C.

      Water closet

    • D.

      Urinal

    Correct Answer
    D. Urinal
    Explanation
    The question is asking which of the listed plumbing fixtures is not included under the definition of a plumbing unit. A plumbing unit typically refers to a system that includes various fixtures for water supply and drainage. A water meter, lavatory, and water closet are all common fixtures found in plumbing units. However, a urinal is not typically included under the definition of a plumbing unit as it is a specialized fixture used primarily in public restrooms or commercial settings.

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  • 13. 

    Which in the list considered the most efficient type of venting system?

    • A.

      Combination waste and vent

    • B.

      Wet vent

    • C.

      Individual vent

    • D.

      Group vent

    Correct Answer
    C. Individual vent
    Explanation
    An individual vent is considered the most efficient type of venting system because it provides dedicated ventilation for each plumbing fixture. This means that each fixture has its own vent pipe that extends vertically to the roof, allowing for optimal air flow and preventing any potential blockages or restrictions. This ensures that the plumbing system operates efficiently and effectively, minimizing the risk of sewer gas buildup and maintaining proper drainage.

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  • 14. 

    What is the recommended slope percentage of horizontal drainage pipe as provided in the code ?

    • A.

      1%

    • B.

      2%

    • C.

      3%

    • D.

      4%

    Correct Answer
    B. 2%
    Explanation
    The recommended slope percentage of horizontal drainage pipe as provided in the code is 2%. This means that the pipe should have a downward slope of 2% for every horizontal foot. This slope is necessary to ensure proper drainage and prevent the accumulation of water or waste in the pipe. A 2% slope allows for efficient flow and helps to prevent clogs or blockages in the pipe.

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  • 15. 

    An upright wye combination is a kind of ________.

    • A.

      Fixture

    • B.

      Tool

    • C.

      Pipe

    • D.

      Fitting

    Correct Answer
    D. Fitting
    Explanation
    An upright wye combination is a type of fitting. This fitting is used in plumbing systems to connect three pipes together in a Y-shaped configuration. It allows for the flow of fluids or gases in different directions.

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  • 16. 

    In a trap, what do you call the vertical distance between the top dip and the crown weir?

    • A.

      Overflow

    • B.

      Invert

    • C.

      Crown

    • D.

      Trap seal

    Correct Answer
    D. Trap seal
  • 17. 

    What testing method is most recommended for sanitary piping system?

    • A.

      Air pressure test

    • B.

      Smoke test

    • C.

      Water pressure test

    • D.

      Hydrostatic test

    Correct Answer
    D. Hydrostatic test
    Explanation
    The most recommended testing method for a sanitary piping system is the hydrostatic test. This test involves filling the pipes with water and pressurizing them to a level higher than their normal operating pressure. By doing so, any leaks or weaknesses in the system can be identified. This method is preferred for sanitary piping systems as it ensures that the pipes are able to withstand the pressure and are watertight, reducing the risk of contamination or damage.

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  • 18. 

    What is the minimum fixture drain size of a wash basin?

    • A.

      25 mm

    • B.

      32 mm

    • C.

      38 mm

    • D.

      50 mm

    Correct Answer
    B. 32 mm
    Explanation
    The minimum fixture drain size of a wash basin is 32 mm. This is the standard size recommended for wash basins to ensure proper drainage and prevent clogging. A smaller drain size may not be sufficient to handle the volume of water and waste generated by a wash basin, leading to drainage issues. Conversely, a larger drain size would be unnecessary and potentially wasteful. Therefore, 32 mm is the optimal size for effective drainage in a wash basin.

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  • 19. 

    Storm water refers to _________.

    • A.

      Rainwater, surface run-off

    • B.

      Liquid plus human waste

    • C.

      Waste from laundry, sink, etc.

    • D.

      Domestic sewage

    Correct Answer
    A. Rainwater, surface run-off
    Explanation
    Storm water refers to rainwater and surface run-off. This includes any water that accumulates on the ground during a storm, such as rainfall or melted snow, as well as the water that flows over surfaces like roads, sidewalks, and rooftops. Storm water can carry pollutants and contaminants from the environment, making it important to manage and treat it properly to protect water quality and prevent flooding.

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  • 20. 

    Which of the following is used to achieve change in direction?

    • A.

      Pipe

    • B.

      Fitting

    • C.

      Fixture

    • D.

      Appurtenance

    Correct Answer
    B. Fitting
    Explanation
    A fitting is used to achieve change in direction. A fitting is a device that connects two or more pipes together, allowing for the flow of fluids or gases. It is designed to change the direction of the flow, such as turning a pipe at a right angle or redirecting it in a different direction. Fittings come in various shapes and sizes, including elbows, tees, and bends, and are essential components in plumbing and piping systems to ensure proper flow and functionality.

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  • 21. 

    Which fitting or fitting combination is best used at the base of a soil or waste stack?

    • A.

      Short sweep, 1/4 bend

    • B.

      1/4 bend

    • C.

      2- 1/8 bend

    • D.

      Wye branch and 1/8 bend

    Correct Answer
    D. Wye branch and 1/8 bend
    Explanation
    The wye branch and 1/8 bend is the best fitting or fitting combination to use at the base of a soil or waste stack. This combination allows for a smooth flow of waste and minimizes the chances of clogs or blockages. The wye branch allows for a branch connection to another pipe, while the 1/8 bend provides a gradual change in direction. This combination ensures efficient drainage and proper functioning of the stack.

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  • 22. 

    Every exposed trap must _________.

    • A.

      Be self cleaning

    • B.

      Have inadequate trap seal in order to cause trap seal loss

    • C.

      Not be provided with a removable cleanout plug

    • D.

      Not be able to retain large amount of waste water

    Correct Answer
    A. Be self cleaning
    Explanation
    Exposure to debris and waste can cause traps to become clogged, leading to blockages and foul odors. By being self-cleaning, traps can prevent the buildup of waste and maintain proper drainage. This ensures that the trap seal is not compromised and the plumbing system functions effectively.

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  • 23. 

    Which of the following is not a sanitary drainage fitting?

    • A.

      Wye branch

    • B.

      Nipple

    • C.

      Tapped tee

    • D.

      Upright wye

    Correct Answer
    B. Nipple
    Explanation
    A nipple is not a sanitary drainage fitting because it is a short piece of pipe with male threads on both ends, used to connect two female threaded fittings. Sanitary drainage fittings are specifically designed to facilitate the proper flow and disposal of waste and wastewater in plumbing systems. Examples of sanitary drainage fittings include wye branches, tapped tees, and upright wyes, which are all specifically designed to connect and direct the flow of waste in a sanitary manner. A nipple, on the other hand, is primarily used for connecting and extending pipe lengths, rather than for sanitary drainage purposes.

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  • 24. 

    Which of the following materials is not recommended for water supply system application?

    • A.

      Concrete pipe

    • B.

      Brass pipe

    • C.

      Plastic pipe

    • D.

      Galvanized steel pipe

    Correct Answer
    A. Concrete pipe
    Explanation
    Concrete pipe is not recommended for water supply system application because it is prone to cracking and corrosion over time. Unlike other materials like brass, plastic, and galvanized steel, concrete pipes are not as durable and can deteriorate quickly when exposed to water and other elements. Additionally, concrete pipes are difficult to repair and maintain, making them less suitable for water supply systems that require regular maintenance and upkeep.

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  • 25. 

    The following are the types of copper tubes EXCEPT __________.

    • A.

      Type K

    • B.

      Type L

    • C.

      Type M

    • D.

      Type N

    Correct Answer
    D. Type N
    Explanation
    The question is asking for the type of copper tubes that is not included in the given options. The options provided are Type K, Type L, Type M, and Type N. Since the question asks for the type that is not included, the correct answer is Type N.

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  • 26. 

    What do you call the supply pipe between the fixture and the water distributing pipe?

    • A.

      Fixture branch

    • B.

      Fixture supply

    • C.

      Water service pipe

    • D.

      Building supply pipe

    Correct Answer
    A. Fixture branch
    Explanation
    The fixture branch refers to the supply pipe that connects the fixture, such as a sink or toilet, to the main water distributing pipe. This pipe carries the water from the main supply to the fixture, allowing for the proper functioning of the fixture. It is an essential component of the plumbing system in a building, ensuring the delivery of water to each individual fixture.

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  • 27. 

    An insanitary type of water closet. What is it?

    • A.

      Hooper type

    • B.

      Plunger type

    • C.

      Pan type

    • D.

      All of these

    Correct Answer
    D. All of these
    Explanation
    The correct answer is "all of these" because an insanitary type of water closet can refer to any of the mentioned types: Hooper type, Plunger type, or Pan type. These types of water closets are considered insanitary due to their design or functionality, which may not meet proper hygiene standards or provide adequate sanitation.

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  • 28. 

    Plastic pipes are manufactured from ___________.

    • A.

      Thermoplastic plastic

    • B.

      Thermoset plastic

    • C.

      Rubber-based plastic

    • D.

      None of the above

    Correct Answer
    A. Thermoplastic plastic
    Explanation
    Plastic pipes are manufactured from thermoplastic plastic because this type of plastic can be melted and reshaped multiple times without undergoing any significant chemical change. This property makes thermoplastic plastic ideal for pipe manufacturing as it allows for easy molding and customization. Thermoset plastic, on the other hand, undergoes a permanent chemical change when heated and cannot be reshaped. Rubber-based plastic is a specific type of thermoplastic that contains rubber additives for improved flexibility and durability. However, since the question does not specify rubber-based plastic, the correct answer is thermoplastic plastic.

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  • 29. 

    The flow of water in a pipe is affected by the following conditions except ___________.

    • A.

      Type of fixture

    • B.

      Size of pipe

    • C.

      Number of turns or changes in direction of pipes

    • D.

      Internal surface condition of pipes

    Correct Answer
    A. Type of fixture
    Explanation
    The flow of water in a pipe is affected by the size of the pipe, the number of turns or changes in direction of pipes, and the internal surface condition of pipes. However, the type of fixture does not directly affect the flow of water in the pipe. Fixtures such as faucets, showers, or toilets control the flow of water once it has already entered the pipe, but they do not impact the flow within the pipe itself.

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  • 30. 

    This tool is used to extract pipes 1 to 2 inches nipple.

    • A.

      Spud wrench

    • B.

      Internal wrench

    • C.

      Monkey wrench

    • D.

      Stillson wrench

    Correct Answer
    B. Internal wrench
    Explanation
    The correct answer is "Internal wrench." An internal wrench is a tool specifically designed to extract pipes, particularly nipples that are 1 to 2 inches in size. This type of wrench is used internally, meaning it is inserted into the pipe or fitting to grip and turn it. It is commonly used in plumbing and pipefitting applications to remove or install pipes securely.

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  • 31. 

    Choose from the list the best type of sewage disposal system.

    • A.

      Seepage pit

    • B.

      Privy

    • C.

      Septic Tank

    • D.

      Cesspool

    Correct Answer
    C. Septic Tank
    Explanation
    A septic tank is the best type of sewage disposal system because it effectively treats and disposes of wastewater from households. It separates solid waste from the liquid, allowing the solids to settle at the bottom while the liquid flows out into a drain field for further treatment. This system is efficient, cost-effective, and environmentally friendly, as it helps prevent contamination of groundwater and soil. Additionally, septic tanks require less maintenance compared to other options like cesspools or privies.

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  • 32. 

    Calculate the volume of a cylindrical tank having a diameter of 1 meter and a length of 2 meters.

    • A.

      1.57 cu m.

    • B.

      1.75 cu m.

    • C.

      2.15 cu m.

    • D.

      3.51 cu m.

    Correct Answer
    A. 1.57 cu m.
    Explanation
    The volume of a cylindrical tank can be calculated using the formula V = πr^2h, where V is the volume, r is the radius, and h is the height or length of the tank. In this case, the diameter is given as 1 meter, so the radius would be 0.5 meters. The length of the tank is given as 2 meters. Plugging these values into the formula, we get V = π(0.5^2)(2) = 1.57 cu m.

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  • 33. 

    The abbreviation DWV stands for ____________.

    • A.

      Drain, waste and vent

    • B.

      Drain, water and vent

    • C.

      Drainage, waste and velocity

    • D.

      Drainpipe waste volume

    Correct Answer
    A. Drain, waste and vent
    Explanation
    The abbreviation DWV stands for "Drain, waste and vent." This is a common term used in plumbing systems to describe the three main functions of a drainage system. The drain is responsible for removing waste water from fixtures, the waste carries the waste water to the sewer or septic system, and the vent allows air to enter the system to prevent pressure buildup and ensure proper drainage flow.

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  • 34. 

    Which type of ventilation system is installed along soil stacks and connected to a vent stack at every five floors branch interval?

    • A.

      Individual vent

    • B.

      Common vent

    • C.

      Local vent

    • D.

      Yoke vent

    Correct Answer
    D. Yoke vent
    Explanation
    A yoke vent is a type of ventilation system that is installed along soil stacks and connected to a vent stack at every five floors branch interval. It helps to maintain proper air pressure and prevent the buildup of gases in the plumbing system. This type of venting system is commonly used in multi-story buildings to ensure efficient and effective ventilation throughout the plumbing system.

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  • 35. 

    The following types of filtration process for water EXCEPT ____________.

    • A.

      Slow sand

    • B.

      Pressure sand

    • C.

      Coagulation

    • D.

      Diatomaceous earth

    Correct Answer
    C. Coagulation
    Explanation
    Coagulation is not a type of filtration process for water. Coagulation is a process in which chemicals are added to water to destabilize and clump together suspended particles, making it easier for them to be removed through filtration or settling. However, it is not a filtration process in itself. Slow sand, pressure sand, and diatomaceous earth are all examples of filtration processes used to remove impurities from water.

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  • 36. 

    An objectionable type of trap.

    • A.

      Full S trap

    • B.

      Bag trap

    • C.

      Metal partition trap

    • D.

      All of these

    Correct Answer
    D. All of these
    Explanation
    The correct answer is "all of these" because all three options mentioned - full S trap, bag trap, and metal partition trap - are considered objectionable types of traps. These traps are not recommended due to their potential to cause clogging, odors, and other plumbing issues. Therefore, it is advisable to avoid using any of these trap types.

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  • 37. 

    What is the other word for toilet?

    • A.

      Water closet

    • B.

      Urinal

    • C.

      Lavatory

    • D.

      Kitchen sink

    Correct Answer
    A. Water closet
    Explanation
    The other word for toilet is "water closet". This term is commonly used in British English to refer to a toilet or a small room containing a toilet. It is derived from the historical practice of having a small closet-like space with a water-flushing toilet.

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  • 38. 

    Where do you install a flushometer valve?

    • A.

      Urinal

    • B.

      Lavatory

    • C.

      Bathtub

    • D.

      Kitchen sink

    Correct Answer
    A. Urinal
    Explanation
    A flushometer valve is typically installed in a urinal. This type of valve is designed to provide a powerful flush to effectively clean and clear the waste from a urinal bowl. It is commonly used in commercial restrooms and public facilities where urinals are installed. The flushometer valve allows for a quick and efficient flush, ensuring proper sanitation and hygiene in the urinal area.

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  • 39. 

    A 1/4 bend is a fitting having an angle equivalent to __________.

    • A.

      30 degrees

    • B.

      45 degrees

    • C.

      60 degrees

    • D.

      90 degrees

    Correct Answer
    D. 90 degrees
    Explanation
    A 1/4 bend is a fitting used in plumbing and piping systems that has an angle equivalent to 90 degrees. This means that it allows for a change in direction of the pipe by 90 degrees.

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  • 40. 

    A pop waste can be found in a ______________.

    • A.

      Water closet

    • B.

      Bathtub

    • C.

      Lavatory

    • D.

      Both b and c

    Correct Answer
    D. Both b and c
    Explanation
    A pop waste can be found in both a bathtub and a lavatory. A pop waste is a type of drain mechanism that is commonly used in these fixtures to control the flow of water and waste. It is designed to open and close easily, allowing water to drain out while preventing any debris from clogging the pipes. Therefore, both the bathtub and lavatory can have a pop waste installed to ensure proper drainage.

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  • 41. 

    DFU is a abbreviation used in sizing what part of the plumbing system?

    • A.

      Water supply pipes

    • B.

      Sanitary drainage pipes

    • C.

      Ventilation pipes

    • D.

      Storm drainage pipes

    Correct Answer
    B. Sanitary drainage pipes
    Explanation
    DFU stands for Drainage Fixture Unit, which is a measure of the flow rate and drainage capacity of a plumbing fixture or system. It is used to determine the size and capacity requirements for sanitary drainage pipes. By calculating the total DFU for all fixtures in a building, the appropriate pipe size can be determined to ensure efficient and effective drainage of waste water and sewage. Therefore, the correct answer is sanitary drainage pipes.

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  • 42. 

    The size of storm drainage system is dependent on the following items or parameters EXCEPT _____________.

    • A.

      Rate of rainfall

    • B.

      Slope of roof

    • C.

      Area of roof or deck

    • D.

      Type of pipe support

    Correct Answer
    D. Type of pipe support
    Explanation
    The size of a storm drainage system is determined by several factors such as the rate of rainfall, slope of the roof, and the area of the roof or deck. However, the type of pipe support does not affect the size of the storm drainage system. The pipe support is responsible for providing stability and preventing the pipes from sagging or collapsing, but it does not impact the overall size requirements of the drainage system.

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  • 43. 

    Technically, which of the following is considered a plumbing appliance?

    • A.

      Water closet

    • B.

      Washing machine

    • C.

      Swimming pool

    • D.

      Floor drain

    Correct Answer
    B. Washing machine
    Explanation
    A washing machine is considered a plumbing appliance because it requires a water supply and drainage system to operate. It is connected to a water source to fill the machine with water and also has a drain pipe to remove the dirty water after the washing cycle is complete. Additionally, a washing machine may also have a connection to a hot water supply for certain wash cycles. Therefore, it meets the criteria of being a plumbing appliance.

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  • 44. 

    Which of the following joint types is commonly used on galvanized steel pipes?

    • A.

      Screwed joint

    • B.

      Flange joint

    • C.

      Welded joint

    • D.

      Solvent cement welded joint

    Correct Answer
    A. Screwed joint
    Explanation
    A screwed joint is commonly used on galvanized steel pipes. This type of joint involves threading the ends of the pipes and using a threaded fitting to connect them. It is a popular choice for galvanized steel pipes because it provides a secure and leak-proof connection. The threaded fittings can easily be tightened or removed as needed, making it convenient for maintenance or repairs. Additionally, the galvanized coating on the pipes helps prevent corrosion, ensuring the longevity of the joint.

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  • 45. 

    What material property characterizes cast iron pipe?

    • A.

      Ductility

    • B.

      Malleability

    • C.

      Brittleness

    • D.

      Flexibility

    Correct Answer
    C. Brittleness
    Explanation
    Cast iron pipe is characterized by its brittleness. This means that it lacks the ability to deform or stretch significantly before fracturing. Unlike ductile materials that can undergo plastic deformation, cast iron is prone to breaking or shattering when subjected to stress or impact. This property makes it suitable for applications where strength and rigidity are required, such as in plumbing systems.

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  • 46. 

    What do you call a type of backflow preventing device used on water supply system?

    • A.

      Gate valve

    • B.

      Backwater valve

    • C.

      Check valve

    • D.

      Float valve

    Correct Answer
    C. Check valve
    Explanation
    A check valve is a type of backflow preventing device used on water supply systems. It allows the flow of water in one direction while preventing backflow in the opposite direction. This is achieved through a mechanism that automatically closes the valve when the flow reverses, preventing any backflow from occurring.

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  • 47. 

    As defined, a floor drain is considered a/an ________.

    • A.

      Fitting

    • B.

      Fixture

    • C.

      Tool

    • D.

      Float valve

    Correct Answer
    B. Fixture
    Explanation
    A floor drain is considered a fixture because it is a permanent part of a building's plumbing system. Fixtures are devices or appliances that are connected to the plumbing system and provide a specific function, such as a sink, toilet, or shower. A floor drain is designed to allow water to drain from the floor, preventing flooding or water damage. It is installed in specific locations, such as bathrooms, basements, or laundry rooms, and is an essential component of the plumbing system in a building.

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  • 48. 

    What is the volume of swimming pool with the following dimensions : depth = 5 ft, width=50 ft. and length = 100 ft?

    • A.

      187,000 gals

    • B.

      120,000 gals

    • C.

      105,000 gals

    • D.

      169,000 gals

    Correct Answer
    A. 187,000 gals
    Explanation
    The volume of a rectangular swimming pool can be calculated by multiplying its length, width, and depth. In this case, the length is 100 ft, the width is 50 ft, and the depth is 5 ft. So, the volume of the swimming pool is 100 ft * 50 ft * 5 ft = 25000 cubic ft. To convert this volume into gallons, we need to multiply it by 7.48 (since 1 cubic ft is approximately equal to 7.48 gallons). Therefore, the volume of the swimming pool is 25000 cubic ft * 7.48 gallons/cubic ft = 187,000 gals.

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  • 49. 

    Which of the following galvanized iron pipes is the heaviest?

    • A.

      Schedule 10

    • B.

      Schedule 40

    • C.

      Schedule 60

    • D.

      Schedule 80

    Correct Answer
    D. Schedule 80
    Explanation
    The correct answer is Schedule 80. In galvanized iron pipes, the schedule refers to the thickness of the pipe wall. A higher schedule number indicates a thicker pipe wall and therefore a heavier pipe. Since Schedule 80 has a higher schedule number than Schedule 10, Schedule 40, and Schedule 60, it is the heaviest among the given options.

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  • 50. 

    Which of the following fixture group qualifies the definition of battery of fixtures?

    • A.

      2 lavatories, 2 urinals and 1 water closet

    • B.

      3 lavatories and 2 water closets

    • C.

      5 water closets

    • D.

      3 water closets, 1 lavatory and 1 floor drain

    Correct Answer
    C. 5 water closets
    Explanation
    A battery of fixtures refers to a group of fixtures that are connected to a common waste and vent system. In this case, the correct answer is 5 water closets because all the fixtures in this group are water closets. The other options include different combinations of lavatories, urinals, and floor drains, which do not meet the criteria of a battery of fixtures.

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