The Ultimate Basic Plumbing! Trivia Quiz

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The Ultimate Basic Plumbing! Trivia Quiz - Quiz

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Questions and Answers
  • 1. 

    What pipe should not be buried underground?

    • A.

      BI pipe

    • B.

      Polyethylene pipe

    • C.

      GI pipe

    • D.

      None

    Correct Answer
    B. Polyethylene pipe
    Explanation
    Polyethylene pipe should not be buried underground because it is not resistant to UV rays and can degrade over time when exposed to sunlight. This can lead to cracks, leaks, and eventual failure of the pipe. Therefore, it is recommended to use other types of pipes such as BI (black iron) or GI (galvanized iron) pipes for underground burial.

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  • 2. 

    Which is not a rule of a thumb when designing a drainage?

    • A.

      As much as possible, pipes must run in a straight line

    • B.

      Underground drainage line should be on top of compacted soil

    • C.

      It should be underneath the driveway

    • D.

      None

    Correct Answer
    C. It should be underneath the driveway
    Explanation
    When designing a drainage system, it is not a rule of thumb for the pipes to be underneath the driveway. This is because having the pipes underneath the driveway can make them difficult to access and maintain in case of any issues. It is generally recommended to avoid placing drainage pipes under areas with heavy traffic or load-bearing structures like driveways to ensure easy accessibility and prevent any potential damage to the pipes.

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  • 3. 

    In a location where there is no provision for drainage line, what is the next best thing?

    • A.

      Store waste in the tank and dispose in sanitary fill

    • B.

      Use drain tiles connected to open field

    • C.

      Connect to the nearest creek

    • D.

      Any of the above

    Correct Answer
    A. Store waste in the tank and dispose in sanitary fill
    Explanation
    When there is no provision for a drainage line, the next best thing would be to store waste in a tank and dispose of it in a sanitary fill. This method ensures that the waste is contained and properly disposed of in a designated area, preventing any contamination or harm to the environment. Using drain tiles connected to an open field or connecting to the nearest creek may not be feasible or environmentally friendly in this situation.

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  • 4. 

    Which plumbing fixture does not have a water-saving feature?

    • A.

      Lavatory with pop-up

    • B.

      1.5 gallon flush water closet

    • C.

      Flow limiting feature

    • D.

      Waterless urinal

    Correct Answer
    C. Flow limiting feature
    Explanation
    The correct answer is "flow limiting feature." This is because a flow limiting feature actually helps to conserve water by restricting the flow rate of water through a plumbing fixture. On the other hand, a lavatory with pop-up, a 1.5 gallon flush water closet, and a waterless urinal all have water-saving features.

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  • 5. 

    In storm drainage system, it is used to prevent aggregates, debris and other unwanted objects from entering the drainage system?

    • A.

      Trap

    • B.

      Catch basin

    • C.

      FD

    • D.

      Storm trap

    Correct Answer
    B. Catch basin
    Explanation
    A catch basin is a component of a storm drainage system that is designed to prevent aggregates, debris, and other unwanted objects from entering the drainage system. It is essentially a large container with a grate on top that allows water to enter while trapping larger objects. This helps to prevent clogging and blockages in the drainage system, allowing for proper water flow and preventing damage or flooding.

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  • 6. 

    Where are storm sewer usually placed?

    • A.

      Under the sidewalk on narrow road and under the road on wide road

    • B.

      Near the curb

    • C.

      At the center of the road

    • D.

      None

    Correct Answer
    B. Near the curb
    Explanation
    Storm sewers are usually placed near the curb. This is because stormwater runoff, which includes rainwater and melted snow, flows along the curb and into the storm sewer system. Placing the storm sewers near the curb allows for efficient collection and drainage of the stormwater, preventing flooding and water damage on the roads and sidewalks.

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  • 7. 

    Minimum size of trap of shower drain?

    • A.

      3

    • B.

      4

    • C.

      2

    • D.

      1 1/2

    Correct Answer
    C. 2
    Explanation
    The minimum size of the trap for a shower drain is 2 inches. This is because a trap is a curved pipe that retains a small amount of water, which prevents sewer gases from entering the bathroom. A 2-inch trap is the standard size for most shower drains and is sufficient to trap debris and prevent clogging. A smaller trap size may not effectively trap debris, leading to potential blockages in the drain.

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  • 8. 

    According to NBC, pipe support should be every,

    • A.

      3 m

    • B.

      1.5 m

    • C.

      2 m

    • D.

      4 m

    Correct Answer
    A. 3 m
    Explanation
    According to NBC (National Building Code), pipe support should be placed every 3 meters. This means that at every 3-meter interval, there should be a support system in place to hold and secure the pipes. This is important to ensure the stability and integrity of the pipes, preventing any potential damage or failure due to excessive weight or stress. Proper pipe support is crucial for the safe and efficient functioning of plumbing systems.

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  • 9. 

    A plumbing devices designed to intercept most greases and solids before they enter a wastewater disposal system. Except for one;

    • A.

      Trap seal

    • B.

      Grease interceptors

    • C.

      Grease recovery devices

    • D.

      Grease converters

    Correct Answer
    A. Trap seal
    Explanation
    Trap seal is the correct answer because it refers to a plumbing device that prevents sewer gases from entering a building by maintaining a water barrier in the plumbing trap. It does not intercept greases and solids like grease interceptors, grease recovery devices, and grease converters do.

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  • 10. 

    Allowable slope of sanitary sewer?

    • A.

      1ft of 1 meter

    • B.

      1/2 in of 1 meter

    • C.

      1/4 of 1meter

    • D.

      1/4 of 1 ft

    Correct Answer
    D. 1/4 of 1 ft
    Explanation
    The allowable slope of a sanitary sewer is 1/4 of 1 ft. This means that for every 1 ft of horizontal distance, the sewer can have a vertical drop of 1/4 ft. This slope is necessary to ensure proper flow and prevent blockages in the sewer system. A steeper slope would cause the sewage to flow too quickly, potentially causing damage or blockages, while a shallower slope would result in slower flow and increased risk of clogs. Therefore, a slope of 1/4 of 1 ft is the ideal balance for efficient and effective sewage flow.

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  • 11. 

    Kind of pipe not suited to be exposed to ultraviolet rays?

    • A.

      PB

    • B.

      Iron

    • C.

      Pvc

    • D.

      Gi

    Correct Answer
    C. Pvc
    Explanation
    PVC (Polyvinyl chloride) is not suited to be exposed to ultraviolet rays because it is not UV resistant. When PVC is exposed to sunlight or other sources of UV radiation, it can degrade and become brittle over time. This can lead to cracks, leaks, and other structural issues in the pipe. On the other hand, PB (Polybutylene), iron, and GI (Galvanized Iron) pipes are not affected by UV rays and can be used in outdoor applications without any issues.

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  • 12. 

    Where should you place soil-pipes for high-rise structures?

    • A.

      Pipe chase

    • B.

      Partitions

    • C.

      RC wall

    • D.

      Column

    Correct Answer
    A. Pipe chase
    Explanation
    In high-rise structures, soil-pipes should be placed in a pipe chase. A pipe chase is a dedicated vertical or horizontal space within the building that is specifically designed to accommodate the soil-pipes. This arrangement allows for easy access, maintenance, and repair of the pipes without the need to disturb other structural elements such as partitions, RC walls, or columns. Placing the soil-pipes in a pipe chase ensures efficient functioning of the plumbing system while minimizing disruptions to the overall structure of the building.

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  • 13. 

    Best location to put the soil pipes?

    • A.

      Drywall

    • B.

      150mm CHB wall

    • C.

      Pipe chase

    • D.

      Box-up with the column

    Correct Answer
    C. Pipe chase
    Explanation
    The best location to put the soil pipes is in a pipe chase. A pipe chase is a dedicated space or enclosure specifically designed to house pipes, providing easy access for maintenance and repairs. Placing the soil pipes in a pipe chase ensures that they are concealed and protected, while also allowing for easy access when needed. This helps to maintain the aesthetics of the space while ensuring the functionality and longevity of the plumbing system.

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  • 14. 

    Can you embed a 4" diameter pipe in a 150 wall?

    • A.

      No

    • B.

      Yes

    Correct Answer
    A. No
    Explanation
    It is not possible to embed a 4" diameter pipe in a 150 wall because the diameter of the pipe is larger than the thickness of the wall.

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  • 15. 

    Should not be used for a pipe chase?

    • A.

      Chb

    • B.

      Drywall

    • C.

      Shearwall

    • D.

      Double wall

    Correct Answer
    B. Drywall
    Explanation
    Drywall should not be used for a pipe chase because it is not a suitable material for enclosing or protecting pipes. Drywall is primarily used as a surface material for interior walls and ceilings, providing a smooth and finished appearance. It is not designed to withstand the pressure, moisture, and potential damage that can occur in a pipe chase. Instead, materials such as metal or plastic pipes or conduits should be used to enclose and protect pipes in a chase.

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  • 16. 

    In the given figure, identify the plumbing fixture in label "8"?

    • A.

      2" 1/4 bend

    • B.

      2" trap assembly

    • C.

      2" 1/4 bend

    • D.

      4" closet bend

    Correct Answer
    D. 4" closet bend
    Explanation
    The correct answer is 4" closet bend. The figure shows various plumbing fixtures labeled with numbers. The label "8" corresponds to a 4" closet bend, which is a curved pipe fitting used to connect the toilet to the drain pipe. This fitting allows for a smooth flow of waste from the toilet into the drainage system.

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  • 17. 

    Which wall is best suited if soil pipe will run through it?

    • A.

      Drywall

    • B.

      6" CHB

    • C.

      Shear wall

    • D.

      Retaining wall

    Correct Answer
    B. 6" CHB
    Explanation
    A 6" CHB (Concrete Hollow Blocks) wall is best suited if a soil pipe will run through it. This is because CHB walls are strong and durable, making them capable of supporting the weight and pressure of a soil pipe. The hollow blocks also provide space for the pipe to pass through without compromising the integrity of the wall. Drywall, shear walls, and retaining walls may not be as suitable for this purpose due to their different construction materials and design purposes.

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  • 18. 

    A pipe fitting having a large radius of curvature?

    • A.

      X11.1

    • B.

      X11.2

    • C.

      X11.3

    • D.

      X11.5

    Correct Answer
    C. X11.3
    Explanation
    X11.3 is the correct answer because a pipe fitting with a large radius of curvature is designed to allow for smoother flow of fluid or gas through the pipe. A larger radius of curvature reduces the amount of friction and turbulence in the flow, resulting in less energy loss and improved efficiency. This type of fitting is commonly used in applications where a high flow rate or low pressure drop is desired.

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  • 19. 

    A tee shaped pipe fitting for making a three-way joint?

    • A.

      X11.8

    • B.

      X11.9

    • C.

      X11.6

    • D.

      X11.4

    Correct Answer
    D. X11.4
    Explanation
    The correct answer is X11.4 because a tee-shaped pipe fitting is specifically designed for making a three-way joint. The tee fitting has one inlet and two outlets, allowing for the connection of three pipes at a right angle. This type of fitting is commonly used in plumbing and piping systems to divert or combine flow in multiple directions.

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  • 20. 

    A tee having a slight curve in 90degree bend transition to channel the flow from a branch pipe in the direction of the main?

    • A.

      X11.1

    • B.

      X11.9

    • C.

      X11.6

    • D.

      X11.7

    Correct Answer
    C. X11.6
    Explanation
    This answer, X11.6, is correct because it describes a tee fitting that has a slight curve in the 90-degree bend transition. This curved design allows the flow from a branch pipe to be channeled in the direction of the main pipe. The other answer options do not mention this specific design feature, making X11.6 the most suitable choice.

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  • 21. 

    A cross fitting having a slight curve in each of the 90degree transition to channel the flow from branch pipes in the direction of the main?

    • A.

      X11.1

    • B.

      X11.6

    • C.

      X11.8

    • D.

      X11.9

    Correct Answer
    C. X11.8
    Explanation
    A cross fitting with a slight curve in each of the 90-degree transitions is designed to channel the flow from the branch pipes towards the main pipe. This curved design helps to reduce turbulence and pressure drop in the flow, ensuring smooth and efficient flow through the fitting. The other options do not mention this specific curved design, making X11.8 the most suitable choice.

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  • 22. 

    An elbow having lugs for attachment to wall or joist?

    • A.

      X12.1

    • B.

      X11.5

    • C.

      X11.4

    • D.

      X11.2

    Correct Answer
    D. X11.2
    Explanation
    This answer suggests that X11.2 is the correct option for an elbow that has lugs for attachment to a wall or joist.

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  • 23. 

    Base on the figure above, which of the following is a 1/8 bend fitting?

    • A.

      A

    • B.

      D

    • C.

      C

    • D.

      B

    Correct Answer
    D. B
    Explanation
    Based on the figure above, option b is a 1/8 bend fitting. This is because it resembles a curved pipe with a 45-degree angle, which is characteristic of a 1/8 bend fitting. Option a is a straight pipe, option d is a 90-degree elbow fitting, and option c is a T-shaped fitting, so they are not 1/8 bend fittings.

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  • 24. 

    Base on the figure above, which of the following is a 1/4 bend fitting?

    • A.

      A

    • B.

      D

    • C.

      C

    • D.

      B

    Correct Answer
    A. A
    Explanation
    Based on the figure, option a is a 1/4 bend fitting. This is because option a shows a curved pipe that bends at a 90-degree angle, forming a quarter of a complete circle. The other options do not show a similar bend or curve, making them incorrect choices for a 1/4 bend fitting.

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  • 25. 

    In the figure above, which is a reducing socket?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    B. B
  • 26. 

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    A. A
  • 27. 

    In the figure above, which is a flange adaptor?

    • A.

      A

    • B.

      B

    • C.

      C

    • D.

      D

    Correct Answer
    D. D
  • 28. 

    Where will you least place a downspout?

    • A.

      At corner of walls

    • B.

      Inside columns

    • C.

      Wall hung

    • D.

      In between window openings

    Correct Answer
    D. In between window openings
    Explanation
    The least ideal place to put a downspout would be in between window openings. This is because the downspout would obstruct the view from the window and potentially cause water to splash onto the window during heavy rainfall. Placing the downspout at the corner of walls, inside columns, or wall hung would be more suitable locations that do not interfere with the functionality of the window.

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  • 29. 

    Copper pipes are classified as what main pipe?

    • A.

      Galvanized iron

    • B.

      Ceramic

    • C.

      S/s

    • D.

      Pvc

    Correct Answer
    B. Ceramic
    Explanation
    Copper pipes are not classified as galvanized iron or PVC pipes because these materials are different from copper. Copper pipes are also not classified as stainless steel (s/s) pipes because stainless steel is a separate material. The correct answer is ceramic, which means that copper pipes are classified as ceramic pipes.

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  • 30. 

    Where traps are used to prevent foul odor from coming out. Which of the following does not have a water trap?

    • A.

      Kitchen sink

    • B.

      Lavatory

    • C.

      Floor drain

    • D.

      Bidet

    Correct Answer
    D. Bidet
    Explanation
    A water trap, also known as a P-trap, is a curved pipe that is filled with water to prevent foul odors from coming back up through the plumbing system. It works by creating a barrier of water that blocks the flow of gases and odors. In this case, all of the options listed have water traps except for the bidet. A bidet is a bathroom fixture used for personal hygiene, and it typically does not have a water trap because it does not require one to prevent foul odors.

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  • 31. 

    Where is water meter located?

    • A.

      Right after the main distribution line connection

    • B.

      Beside the water pump

    • C.

      Within RROW, right before the property line

    • D.

      Right side of the water pump or in it's flow direction

    Correct Answer
    A. Right after the main distribution line connection
    Explanation
    The water meter is located right after the main distribution line connection. This is because the water meter is used to measure the amount of water that is being distributed to a property. By placing it right after the main distribution line connection, it allows for an accurate measurement of the water being supplied to the property.

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  • 32. 

    What is the color coding of pipes for potable water?

    • A.

      Cyan

    • B.

      Green

    • C.

      Blue

    • D.

      Light blue

    Correct Answer
    C. Blue
    Explanation
    The color coding for pipes used for potable water is blue. This is a universally recognized standard that helps to easily identify the type of water being transported through the pipes. Blue color coding is specifically used for potable water to ensure that it is not confused with other types of water or substances.

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  • 33. 

    What is the color of pipes for steam?

    • A.

      Light blue

    • B.

      Gray

    • C.

      Blue

    • D.

      White

    Correct Answer
    D. White
    Explanation
    The color of pipes for steam is white. This is because white pipes are used to indicate that they are carrying steam. The color coding of pipes is an important safety measure in industries to ensure that workers can easily identify the contents of the pipes and take appropriate precautions. White is specifically used for steam pipes to distinguish them from other types of pipes and prevent any confusion or accidents.

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  • 34. 

    Minimum clearance from the floor of pipes for AC units when crossing a hallway or corridor?

    • A.

      2.1 m

    • B.

      2.2 m

    • C.

      2.3 m

    • D.

      2.4 m

    Correct Answer
    C. 2.3 m
    Explanation
    The minimum clearance from the floor of pipes for AC units when crossing a hallway or corridor is 2.3 m. This clearance is necessary to ensure that there is enough space for people to walk under the pipes without any risk of hitting their heads or interfering with the AC unit's functionality. A clearance of 2.3 m allows for comfortable passage while also maintaining the proper distance between the pipes and the floor.

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  • 35. 

    What is the color of communication line piping?

    • A.

      White

    • B.

      Orange

    • C.

      Gray

    • D.

      Silver

    Correct Answer
    C. Gray
    Explanation
    The color of communication line piping is gray.

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  • 36. 

    Plumbing permit shall be invalid if work has not commenced after a period of?

    • A.

      6 months

    • B.

      1 year

    • C.

      180 days

    • D.

      None

    Correct Answer
    B. 1 year
    Explanation
    A plumbing permit is typically issued for a specific period of time during which the work is expected to commence and be completed. If the work has not commenced after a certain period, the permit becomes invalid. In this case, the correct answer is "1 year," indicating that if the plumbing work has not started within a year of obtaining the permit, the permit will be considered invalid.

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  • 37. 

    Standard Water pressure from NAWASA?

    • A.

      60psi

    • B.

      120psi

    • C.

      30 psi

    • D.

      40 psi

    Correct Answer
    A. 60psi
    Explanation
    The correct answer is 60psi. This indicates that the standard water pressure from NAWASA is 60 pounds per square inch. Water pressure is a measure of the force that pushes water through pipes and into homes or buildings. A higher water pressure can result in stronger water flow, while a lower water pressure may lead to weaker flow. In this case, NAWASA maintains a water pressure of 60psi, ensuring a satisfactory water flow for its customers.

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  • 38. 

    Valve permitting a gas or liquid to flow in 1 direction?

    • A.

      Check valve

    • B.

      Globe valve

    • C.

      Angle valve

    • D.

      Gate valve

    Correct Answer
    A. Check valve
    Explanation
    A check valve is designed to permit the flow of gas or liquid in only one direction. It allows the fluid to pass through in the desired direction, but prevents it from flowing back in the opposite direction. This is achieved through the use of a one-way valve mechanism, which opens when the pressure on the inlet side is greater than the outlet side, and closes when the pressure on the outlet side is higher. Therefore, a check valve is the correct answer for a valve that permits flow in only one direction.

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  • 39. 

    How do you connect 2 hub less cast iron pipes?

    • A.

      Coupling

    • B.

      Elbow

    • C.

      Structural compression gasket

    • D.

      Polymer compression gasket

    Correct Answer
    C. Structural compression gasket
    Explanation
    A structural compression gasket is used to connect two hub less cast iron pipes. This type of gasket provides a secure and tight seal between the pipes, ensuring that there are no leaks or disruptions in the flow of fluid. It is designed to withstand the pressure and stress placed on the pipes, making it an ideal choice for connecting hub less cast iron pipes. Couplings and elbows may also be used in pipe connections, but in this specific scenario, a structural compression gasket is the correct choice.

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  • 40. 

    What is the most efficient tools for cutting cast iron pipe?

    • A.

      Handsaw

    • B.

      Hacksaw

    • C.

      Chisel and hammer

    • D.

      Snap cutter

    Correct Answer
    D. Snap cutter
    Explanation
    A snap cutter is the most efficient tool for cutting cast iron pipe because it is specifically designed for this purpose. It has a chain with cutting wheels that can easily cut through the tough material of the cast iron pipe. This tool provides a clean and precise cut without much effort, making it the preferred choice for professionals working with cast iron pipes.

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  • 41. 

    A term used to describe pumps that are interconnected with each other?

    • A.

      Gang

    • B.

      Series

    • C.

      Battery

    • D.

      None

    Correct Answer
    C. Battery
    Explanation
    The term "battery" is used to describe pumps that are interconnected with each other. This term is commonly used in situations where multiple pumps are connected in a parallel arrangement to work together and provide a higher flow rate or increased pressure. The pumps in a battery arrangement work in coordination to achieve the desired pumping outcome.

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  • 42. 

    What type of pipe is not recommended for water line?

    • A.

      Copper

    • B.

      Lead

    • C.

      GI

    • D.

      Iron

    Correct Answer
    B. Lead
    Explanation
    Lead is not recommended for water lines because it can contaminate the water and pose health risks. Lead pipes can leach lead particles into the water, especially when the water is acidic or has been sitting in the pipes for a long time. Lead exposure can lead to various health problems, particularly in children, including developmental delays, learning difficulties, and damage to the brain and nervous system. Therefore, using lead pipes for water lines is not recommended.

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  • 43. 

    A drain connecting one or more fixtures to a solid or waste stack?

    • A.

      Combined drain

    • B.

      Floor drain

    • C.

      Circuit drain

    • D.

      Branch drain

    Correct Answer
    A. Combined drain
    Explanation
    A combined drain is a type of drain that connects multiple fixtures to a solid or waste stack. This means that it can collect wastewater from different sources, such as sinks, toilets, and showers, and direct it to a main drainage system. The term "combined" refers to the fact that it combines the drainage from multiple fixtures into one drain line. This type of drain is commonly used in residential and commercial buildings to efficiently manage wastewater disposal.

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  • 44. 

    During the site inspection, the architect notices that a soil pipe will cross a beam, whats the best advice he can do?

    • A.

      Resize the diameter of the soil pipe, enough that can go across the beam without affecting it

    • B.

      It doesn't matter anyway, let the master plumber handle it.

    • C.

      Drill a hole of the beam, enough diameter that a pipe could go in and pass through. Just make sure that the hole is precisely in the middle to avoid the bars to be hit in.

    • D.

      Simply ask to relocate, it's just a pipe anyway

    Correct Answer
    D. Simply ask to relocate, it's just a pipe anyway
    Explanation
    The best advice in this situation would be to simply ask to relocate the soil pipe. This is because the architect has noticed that the pipe will cross a beam, which could potentially cause damage or structural issues. By asking to relocate the pipe, the architect can ensure that the integrity of the beam and overall structure is not compromised.

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  • 45. 

    What should not be permitted to cross a beam?

    • A.

      Soil pipe

    • B.

      Electrical wiring

    • C.

      Water pipe

    • D.

      AC ducts

    Correct Answer
    A. Soil pipe
    Explanation
    Soil pipes should not be permitted to cross a beam because they can cause structural issues. Soil pipes are used for waste disposal and can carry heavy loads of water and waste. Crossing a beam can put excessive weight on the beam and potentially cause it to weaken or fail. It is important to ensure that any pipes crossing beams are properly supported to avoid any structural damage.

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  • 46. 

    Maximum distance of clean-out?

    • A.

      5 m

    • B.

      6 m

    • C.

      10m center to center

    • D.

      15 m

    Correct Answer
    A. 5 m
    Explanation
    The maximum distance of clean-out is 5 m. This means that the furthest distance between two clean-out points should not exceed 5 meters. Clean-out points are typically installed in plumbing systems to provide access for cleaning and maintenance purposes. By limiting the distance between clean-out points to 5 meters, it ensures that the system can be easily accessed and maintained without any inconvenience or difficulty.

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  • 47. 

    What is the best fixture for a public comfort room?

    • A.

      Gate valve

    • B.

      Flushometer

    • C.

      Faucet

    • D.

      None

    Correct Answer
    B. Flushometer
    Explanation
    A flushometer is the best fixture for a public comfort room because it is designed specifically for high-traffic areas. It is a valve that controls the flow of water to flush a toilet or urinal, ensuring a powerful and efficient flush every time. Unlike a faucet or gate valve, a flushometer is specifically designed for toilets and urinals, making it the most suitable choice for a public comfort room.

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  • 48. 

    There are several reasons why soil stacks are not allowed in columns. Which is not a reason?

    • A.

      Pipes will interfere with reinforcing bars

    • B.

      The size of the columns will be larger

    • C.

      Cracks and leaks cannot be detected

    • D.

      The gas emitted will deteriorate concrete

    Correct Answer
    C. Cracks and leaks cannot be detected
    Explanation
    The reason why cracks and leaks cannot be detected is not a reason for why soil stacks are not allowed in columns. Soil stacks are not allowed in columns because pipes will interfere with reinforcing bars, the size of the columns will be larger, and the gas emitted will deteriorate concrete. However, cracks and leaks not being detectable is not mentioned as a reason for not allowing soil stacks in columns.

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  • 49. 

    How do we size sewage pits?

    • A.

      Volume of solid waste only

    • B.

      Volume of liquid waste

    • C.

      Volume of solid, liquid and storm

    • D.

      None

    Correct Answer
    A. Volume of solid waste only
    Explanation
    To size sewage pits, we need to consider the volume of solid waste only. This is because sewage pits are designed to hold and treat solid waste, such as feces, toilet paper, and other non-liquid materials. The volume of liquid waste is not relevant in this context, as it typically flows through the pit and is treated separately. Similarly, the volume of stormwater is not considered when sizing sewage pits, as stormwater is typically managed through separate drainage systems. Therefore, the correct answer is to consider the volume of solid waste only when sizing sewage pits.

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  • 50. 

    What can be discharge directly to sewer system?

    • A.

      Buiding sewer

    • B.

      Oil and grease

    • C.

      Storm water

    • D.

      Grey water

    Correct Answer
    A. Buiding sewer
    Explanation
    Building sewer can be discharged directly to the sewer system because it is designed to carry wastewater from a building to the public sewer system. It is specifically built to handle the discharge of domestic wastewater, including water from toilets, sinks, showers, and laundry. Unlike stormwater, which contains pollutants and contaminants from rainwater runoff, building sewer is meant to transport only wastewater that has been treated or is suitable for treatment in the public sewer system. Therefore, building sewer is an acceptable discharge to the sewer system.

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