Basic Plumbing Principle Trivia Quiz

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  • 1/50 Questions

    Are required for roof areas, courts and courtyards to collect stormwater and discharge the stormwater to an approved point of disposal not in conflict with other ordinances or regulations.

    • Storm drainage
    • Vent system
    • Water supply
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About This Quiz

Explore the Basic Plumbing Principle trivia quiz to understand key regulations and principles guiding plumbing practices in the Philippines, established since 18 June 1955. This quiz assesses knowledge on water supply requirements, fixture pressures, water conservation in plumbing, and safety measures in water heating.

Basic Plumbing Principle Trivia Quiz - Quiz

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  • 2. 

    Roof drains passing through the roof into the interior of a building shall be made __________ at the roof level by the use of C.l. drain with integrally-cast waterstop ring around the outside of body and placed at mid-depth of the concrete roof slab and the installation of a clamped suitable flashing material around the drain.

    • Watertight

    • Airtight

    • None of these

    Correct Answer
    A. Watertight
    Explanation
    The correct answer is "watertight". In order to prevent any leakage or water penetration, roof drains passing through the roof into the interior of a building should be made watertight at the roof level. This can be achieved by using a C.l. drain with an integrally-cast waterstop ring around the outside of the body, placed at mid-depth of the concrete roof slab, and by installing a clamped suitable flashing material around the drain. This ensures that no water can enter the building through the roof drains, protecting the interior from potential water damage.

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  • 3. 

     No plumbing or drainage system, building sewer, private sewer disposal system or part thereof, shall be covered, concealed or put into use until it has been inspected, tested and approved as prescribed in the Code.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is stating that any plumbing or drainage system, building sewer, private sewer disposal system, or any part of it, cannot be covered, concealed, or put into use until it has been inspected, tested, and approved as per the Code. This means that before these systems can be used, they need to go through a proper inspection and testing process to ensure they meet the required standards and regulations. Therefore, the answer "true" indicates that the statement is correct.

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  • 4. 

    Principle 1. All premises intended for human habitation, occupancy or use shall be provided with a _______ of pure and wholesome water, neither connected with unsafe water supplies nor subject to hazards of backflow or back-siphonage.

    • Supply

    • Demand

    • None of these

    Correct Answer
    A. Supply
    Explanation
    The correct answer is "supply" because Principle 1 states that all premises intended for human habitation, occupancy, or use should be provided with a supply of pure and wholesome water. This means that the premises should have access to a source of clean and safe water that is not connected to any unsafe water supplies and is not at risk of backflow or back-siphonage hazards.

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  • 5. 

    Principle 4. Devices for heating and storing water shall be so designed and installed as to prevent dangers from ____________ through overheating.

    • Explosion

    • Expansion

    • Contraction

    • None of these

    Correct Answer
    A. Explosion
    Explanation
    According to Principle 4, devices for heating and storing water should be designed and installed in a way that prevents dangers from explosion through overheating. This means that the correct answer is "explosion" as it aligns with the principle mentioned.

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  • 6. 

    It shall be the duty of the Registered and Licensed Master Plumber doing the work authorized by the permit to notify the  Administrative Authority that said work is ready for inspection. Such notification shall be given not less than ________  before the work is  inspected

    • Three (3) days

    • Two (2) days

    • Four (4) days

    Correct Answer
    A. Three (3) days
    Explanation
    The correct answer is three (3) days. According to the given information, it is the responsibility of the Registered and Licensed Master Plumber to inform the Administrative Authority when the work authorized by the permit is ready for inspection. This notification should be given at least three days before the inspection takes place.

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  • 7. 

    Threaded joints for Iron Pipe Size (IPS) pipe and fittings shall be standard taper pipe threads.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Threaded joints for Iron Pipe Size (IPS) pipe and fittings are required to have standard taper pipe threads. This means that the threads on the pipe and fittings are designed to taper towards the end, allowing them to create a tight and secure connection when tightened together. Standard taper pipe threads are commonly used in plumbing systems to ensure a reliable and leak-free joint. Therefore, the statement "Threaded joints for Iron Pipe Size (IPS) pipe and fittings shall be standard taper pipe threads" is true.

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  • 8. 

    When applied to a fixture, connection, appliance or equipment, shall mean having access thereto, but which may require prior removal of an access panel, door or similar obstruction.

    • Accessible

    • Approved

    • Accepted

    • None of these

    Correct Answer
    A. Accessible
    Explanation
    The term "accessible" refers to the ability to reach or have access to something. In the context of the question, when applied to a fixture, connection, appliance, or equipment, it means that it can be reached or accessed. However, it may require the prior removal of an access panel, door, or similar obstruction. Therefore, the correct answer is "accessible."

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  • 9. 

    Rainwater piping shall not be used as soil, waste & vent pipes.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Rainwater piping should not be used as soil, waste, and vent pipes because these pipes serve different purposes and have different requirements. Soil, waste, and vent pipes are designed to carry solid and liquid waste from toilets, sinks, and other fixtures, as well as to provide ventilation to prevent the buildup of harmful gases. On the other hand, rainwater piping is specifically designed to collect and transport rainwater from roofs and other surfaces. Using rainwater piping for soil, waste, and vent purposes can lead to blockages, leaks, and other plumbing issues, jeopardizing the proper functioning of the plumbing system.

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  • 10. 

    Any public space, public park or thoroughfare less than three (3) meters but not less than two (2) meters in width dedicated or deeded for public use.

    • Alley

    • Lot

    • Court

    • None of these

    Correct Answer
    A. Alley
    Explanation
    An alley is a narrow passageway or street between buildings or walls. It is typically less than three meters but not less than two meters in width and is dedicated or deeded for public use. Therefore, an alley fits the description provided in the question.

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  • 11. 

    All concrete septic tanks shall be protected from corrosion by coating with an approved _________ coating or by other acceptable means.

    • Bituminous

    • Sealant

    • Proofing

    • None of these

    Correct Answer
    A. Bituminous
    Explanation
    Concrete septic tanks need to be protected from corrosion, and one way to achieve this is by coating them with a bituminous coating. Bituminous coatings are made from asphalt or coal tar and provide a protective barrier against corrosion. This coating prevents water and other corrosive substances from coming into direct contact with the concrete, extending the lifespan of the septic tank. Other acceptable means of protection may exist, but the given answer specifically mentions the use of a bituminous coating.

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  • 12. 

     the water test shall be applied to the drainage and vent systems either in its entirety or in sections. If applied to the entire system, all openings in the piping shall be tightly closed, except the _________ opening, and the system filled with water to the point of overflow.

    • Highest

    • Lowest

    • None of these

    Correct Answer
    A. Highest
    Explanation
    The water test is used to check for leaks in the drainage and vent systems. To perform the test, all openings in the piping, except the highest opening, are tightly closed. The system is then filled with water until it overflows. This allows any leaks to be easily identified, as water will escape from the highest point in the system. Therefore, the correct answer is "highest".

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  • 13. 

    The Plumbing Law of the Philippines was approved on

    • 18 June 1955

    • 21 June 1955

    • 19 June 1956

    • 16 June 1955

    Correct Answer
    A. 18 June 1955
    Explanation
    The correct answer is 18 June 1955. This date signifies the approval of the Plumbing Law of the Philippines. It is important to note that the other dates mentioned are not the correct dates of approval.

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  • 14. 

    Pressure test on joints and connections of pipes and fittings in the plumbing system shall be required to ensure ___________ connections.

    • Gastight and watertight

    • Gastight

    • Watertight

    • None of these

    Correct Answer
    A. Gastight and watertight
    Explanation
    A pressure test on joints and connections of pipes and fittings in the plumbing system is required to ensure that the connections are both gastight and watertight. This means that the joints and connections should not allow any gas or water to leak out, ensuring the system's efficiency and preventing any potential damage or hazards.

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  • 15. 

    ABS

    • Acrylonitrile-Butadiene-Styrene

    • Acrylonitrile-Butadyene-Styrene

    • Acrlonitrile-Butadiene-Styrene

    • None of these.

    Correct Answer
    A. Acrylonitrile-Butadiene-Styrene
    Explanation
    The correct answer is "Acrylonitrile-Butadiene-Styrene". ABS is an acronym for Acrylonitrile-Butadiene-Styrene, which is a common thermoplastic polymer. It is known for its toughness, impact resistance, and heat resistance, making it suitable for various applications such as automotive parts, toys, and household appliances. The other options provided are variations in spelling but do not represent the correct acronym for ABS.

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  • 16. 

    Vertical rainwater piping shall be sized  based upon maximum depth in mm or ________________ falling upon a given roof area in square meter.

    • rainfall per hour

    • rainfall per minute

    • rainfall per seconds

    Correct Answer
    A. rainfall per hour
    Explanation
    Vertical rainwater piping needs to be sized based on the maximum depth of rainfall in millimeters falling on a given roof area in square meters. This is because the size of the piping should be able to handle the maximum amount of water that can accumulate on the roof during a heavy rainfall event. Therefore, considering the rainfall per hour is the most appropriate option for sizing the rainwater piping.

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  • 17. 

    Shall mean direct access without the necessity of removing any panel, door or similar obstruction.

    • Readily accessible

    • Accessible

    • Approved

    • None of these.

    Correct Answer
    A. Readily accessible
    Explanation
    Readily accessible means that something is easily and conveniently accessible without the need to remove any barriers or obstacles such as panels, doors, or similar obstructions. It implies that the item or area can be reached quickly and without any hindrances, allowing for easy and immediate access. This term is often used in contexts where quick and effortless access is required for safety, maintenance, or operational purposes.

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  • 18. 

    Principle 2. Plumbing fixtures, devices and appurtenances shall be supplied with water in sufficient _________ and at a pressure adequate to enable them to function satisfactorily and without undue noise under all normal conditions of use.

    • Volume

    • Quality

    • Quantity

    • None of these

    Correct Answer
    A. Volume
    Explanation
    Plumbing fixtures, devices, and appurtenances need to be supplied with water in sufficient volume in order to function properly and without excessive noise. This means that there should be enough water flowing through the system to meet the needs of the fixtures and appliances. If there is not enough volume of water, the fixtures may not work correctly or may produce loud noises. Therefore, volume is the correct answer in this context.

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  • 19. 

    Principle 5 Every ____________________ having plumbing fixtures installed and intended for human habitation, occupancy or use on premises abutting on a street, alley or easement where there is a public sewer, shall be connected to the sewer system.

    • Building

    • House

    • Structure

    • None of these

    Correct Answer
    A. Building
    Explanation
    According to Principle 5, every building having plumbing fixtures installed and intended for human habitation, occupancy, or use on premises abutting on a street, alley, or easement where there is a public sewer, must be connected to the sewer system. This means that any structure or house that meets these criteria must have a connection to the public sewer system.

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  • 20. 

    Downspouts for high-rise buildings shall be of stronger pipe materials to resist the high ___________ inside the vertical downspout installed within the pipe chase which has no intermediate branch from the roof to the ground level.

    • Hydrostatic pressure

    • Gauge pressure

    • Air pressure

    Correct Answer
    A. Hydrostatic pressure
    Explanation
    High-rise buildings have a significant amount of water pressure due to the height of the building. This water pressure, known as hydrostatic pressure, increases as the water moves down the vertical downspout within the pipe chase. To withstand this high pressure, stronger pipe materials are required for the downspouts. Gauge pressure and air pressure are not relevant in this context.

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  • 21. 

    Caulked joints for bell-and-spigot Cast Iron Soil Pipe (CISP) and other similar joints shall be firmly packed with oakum or hemp and filled with molten pig to a depth of not less than ________.

    • 25.4 mm

    • 21.4 mm

    • 15.5 mm

    • 30 mm

    Correct Answer
    A. 25.4 mm
    Explanation
    Caulked joints for bell-and-spigot Cast Iron Soil Pipe (CISP) and other similar joints should be filled with molten pig to a depth of not less than 25.4 mm. This ensures a secure and watertight connection between the pipes, preventing any leakage or seepage. Oakum or hemp is used to firmly pack the joints before filling them with molten pig, further enhancing the strength and durability of the joint.

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  • 22. 

    Minimum trap diameter and dfu for bidet.

    • 38mm and 2

    • 38mm and 3

    • 51mm and 2

    • 51mm and 3

    Correct Answer
    A. 38mm and 2
    Explanation
    The correct answer is 38mm and 2. This means that the minimum trap diameter for a bidet should be 38mm and it should have a drainage fixture unit (dfu) of 2. The trap diameter refers to the size of the pipe that prevents sewer gases from entering the bidet, and a larger diameter ensures better ventilation. The dfu indicates the flow rate and capacity of the bidet's drainage system, with a higher number indicating a greater capacity. Therefore, a 38mm trap diameter and a dfu of 2 would be the appropriate specifications for a bidet.

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  • 23. 

    Minimum horizontal distance from septic tank to buildings/structures.

    • 1.5 m

    • 0.6 m

    • 15.2 m

    • None of these.

    Correct Answer
    A. 1.5 m
    Explanation
    The minimum horizontal distance from a septic tank to buildings/structures should be 1.5 meters. This distance is necessary to ensure that the septic tank does not pose any risk to the buildings or structures, such as damage to their foundations or contamination of their water sources. By maintaining this distance, the septic tank can operate effectively and safely without causing any harm to nearby structures.

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  • 24. 

    Principle 3. Plumbing shall be designed and adjusted to use the minimum __________ of water consistent with proper performance and cleaning.

    • Quantity

    • Volume

    • Quality

    • None of these

    Correct Answer
    A. Quantity
    Explanation
    The correct answer is "quantity" because the principle states that plumbing should be designed and adjusted to use the minimum amount of water. This means that the focus is on the quantity of water being used, rather than the volume or quality. The goal is to ensure that the plumbing system is efficient and conserves water while still performing its intended functions and allowing for proper cleaning.

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  • 25. 

    Dome-Type Strainers shall have a minimum total net inlet area of ___________ times the area of the outlet pipe to which it is connected.

    • One and one - half (1 1/2)

    • One and one - fourth (1 1/4)

    • Twice

    Correct Answer
    A. One and one - half (1 1/2)
    Explanation
    Dome-Type Strainers are designed to remove debris from pipelines and prevent clogging. The minimum total net inlet area of the strainer should be 1 1/2 times the area of the outlet pipe it is connected to. This ensures that there is enough space for the flow of fluid and prevents any blockages. Having a larger inlet area also helps to reduce pressure drop and maintain the efficiency of the system. Therefore, the correct answer is one and one-half (1 1/2).

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  • 26. 

    A physical separation, which may be a low inlet into the indirect waste receptor from the fixture, appliance or device indirectly connected.

    • Airbreak

    • Air gap

    • Vertical height

    • None of these

    Correct Answer
    A. Airbreak
    Explanation
    An airbreak refers to a physical separation, such as a low inlet, that is used to prevent backflow of water from a fixture, appliance, or device into the indirect waste receptor. This separation helps to maintain the cleanliness and safety of the water supply system by preventing contamination. An airbreak is different from an air gap, which is a vertical height between the fixture and the receptor. Therefore, the correct answer is airbreak.

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  • 27. 

    Roof deck strainers for use on sun decks, parking decks and similar occupied areas shall be an approved flat-surface type which is level with the deck. Such drains shall have a total net inlet area not less than _______ times the area of the outlet pipe to which the drain is connected.

    • Two (2)

    • Two (3)

    • One/half (1/2)

    Correct Answer
    A. Two (2)
    Explanation
    Roof deck strainers for occupied areas, such as sun decks and parking decks, must be an approved flat-surface type that is level with the deck. These drains should have a total net inlet area that is at least two times the area of the outlet pipe to which the drain is connected. This ensures adequate drainage and prevents any potential overflow or pooling of water on the deck.

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  • 28. 

    Rainwater downspout or conductor located on the exterior side of a low height building shall be not less than

    • 26 ga. galvanized sheet metal

    • 28 ga. galvanized sheet metal

    • 24 ga. galvanized sheet metal

    Correct Answer
    A. 26 ga. galvanized sheet metal
    Explanation
    The correct answer is 26 ga. galvanized sheet metal. This is because rainwater downspouts or conductors located on the exterior side of a low height building need to be strong and durable to withstand weather conditions. 26 ga. galvanized sheet metal is thicker and more resistant to corrosion compared to 28 ga. or 24 ga. galvanized sheet metal, making it the most suitable choice for this purpose.

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  • 29. 

    What is the minimum trap diameter and trap arm size of a water closet for public and private installation?

    • 76 mm

    • 102 mm

    • 51 mm

    • None of the above.

    Correct Answer
    A. 76 mm
    Explanation
    The minimum trap diameter and trap arm size of a water closet for both public and private installation is 76 mm. This size is necessary to ensure proper drainage and prevent clogging in the plumbing system. A larger trap diameter and trap arm size would allow for more efficient flow of waste and reduce the risk of blockages. Therefore, the correct answer is 76 mm.

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  • 30. 

    Threaded plastic pipe shall be _________ minimum wall thickness.

    • Schedule 80

    • Schedule 40

    • Schedule 100

    • None of the above

    Correct Answer
    A. Schedule 80
    Explanation
    Threaded plastic pipe shall have a minimum wall thickness of schedule 80. Schedule 80 refers to a specific thickness of pipe wall that is suitable for threaded plastic pipes. This thickness ensures that the pipe is strong and durable enough to withstand the pressure and stress of being threaded and used in various applications. Schedule 40 and schedule 100 do not provide the same level of thickness and strength as schedule 80, making them unsuitable for threaded plastic pipes. Therefore, the correct answer is schedule 80.

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  • 31. 

    Minimum horizontal distance from septic tank to seepage pits or cesspools.

    • 1.5 m

    • 15.2 m

    • Option 3

    • 0.6 m

    Correct Answer
    A. 1.5 m
    Explanation
    The minimum horizontal distance from a septic tank to seepage pits or cesspools should be 1.5 m. This distance is necessary to ensure proper drainage and avoid contamination of the surrounding soil and groundwater. It allows for adequate separation between the septic tank and the seepage pits or cesspools, reducing the risk of sewage leakage and potential health hazards. A distance of 1.5 m also allows for easier maintenance and inspection of the septic system.

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  • 32. 

    When a pipe joint material is used, it shall be applied only on the ________ threads and such materials shall be approved type, insoluble in water and nontoxic.

    • Male

    • Female

    • Male and female

    • None of these

    Correct Answer
    A. Male
    Explanation
    When a pipe joint material is used, it shall be applied only on the male threads. This means that the material should only be applied to the threads of the male part of the joint, not the female part. The material should also be approved type, insoluble in water, and nontoxic to ensure the safety and effectiveness of the joint.

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  • 33. 

    Size of cleanout for a 51 mm diameter pipe.

    • 38 mm

    • 51 mm

    • 32 mm

    • None of these

    Correct Answer
    A. 38 mm
    Explanation
    The correct answer is 38 mm. The size of the cleanout for a pipe is typically smaller than the diameter of the pipe itself. In this case, since the pipe diameter is 51 mm, the appropriate size for the cleanout would be 38 mm. This allows for easy access and maintenance of the pipe system without compromising its functionality.

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  • 34. 

    Size of cleanout for a 38 mm diameter pipe.

    • 38 mm

    • 51 mm

    • 32 mm

    • None of these

    Correct Answer
    A. 38 mm
    Explanation
    The size of the cleanout for a 38 mm diameter pipe would be 38 mm. The cleanout is typically designed to match the diameter of the pipe it is connected to, allowing for easy access for cleaning and maintenance purposes. Therefore, in this case, the cleanout size would match the diameter of the pipe, which is 38 mm.

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  • 35. 

    Size of cleanout for a 64 mm diameter pipe.

    • 64 mm

    • 51 mm

    • 76 mm

    • None of these

    Correct Answer
    A. 64 mm
    Explanation
    The size of the cleanout for a 64 mm diameter pipe would be 64 mm. This means that the cleanout should have the same diameter as the pipe itself. A cleanout is a point of access in a plumbing system that allows for easy cleaning and maintenance. In order to effectively clean and inspect the pipe, the cleanout should match the diameter of the pipe to ensure proper access. Therefore, the correct answer is 64 mm.

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  • 36. 

    Minimum horizontal distance from septic tank to disposal field.

    • 1.5 m

    • 15.2 m

    • 0.6 m

    • None of the above.

    Correct Answer
    A. 1.5 m
    Explanation
    The minimum horizontal distance from the septic tank to the disposal field is 1.5 meters. This distance is necessary to ensure proper functioning and prevent any contamination or damage to the disposal field. A greater distance may be required in some cases, depending on local regulations and the specific conditions of the site. The other options (15.2 m, 0.6 m, None of the above) are not correct because they do not meet the minimum requirement for the horizontal distance.

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  • 37. 

    Minimum trap diameter and dfu of bathtub.

    • 38mm and 2

    • 51mm and 2

    • 38mm and 3

    • 51mm and 2

    Correct Answer
    A. 38mm and 2
    Explanation
    The correct answer is 38mm and 2. This means that the minimum trap diameter for a bathtub should be 38mm and it should have a drainage fixture unit (dfu) of 2. The trap diameter refers to the size of the pipe that is used to create a water seal in the plumbing system, preventing sewer gases from entering the living space. The dfu represents the load or demand that a particular fixture places on the plumbing system. In this case, a bathtub with a minimum trap diameter of 38mm and a dfu of 2 would be appropriate for the plumbing system.

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  • 38. 

    Minimum trap diameter and dfu for drinking fountains.

    • 31mm and 1

    • 51mm and 2

    • 38mm and 2

    • 31mm and 2

    Correct Answer
    A. 31mm and 1
    Explanation
    The correct answer is 31mm and 1. This means that the minimum trap diameter for drinking fountains should be 31mm and the required dfu (drainage fixture unit) is 1. This indicates that the drainage system for drinking fountains should have a minimum trap diameter of 31mm and be able to handle a drainage fixture unit of 1.

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  • 39. 

    The bituminous coating on concrete septic tanks shall extend to at least __________ below the water line and shall cover all the internal area above that point.

    • 101.6 mm

    • 76 mm

    • 150 mm

    • None of these.

    Correct Answer
    A. 101.6 mm
    Explanation
    The bituminous coating on concrete septic tanks should extend to at least 101.6 mm below the water line and cover all the internal area above that point. This coating is important to protect the concrete from corrosion and deterioration caused by the presence of water and sewage. By extending the coating below the water line, it ensures that the entire internal area of the tank is adequately protected. A coating of 101.6 mm provides a sufficient barrier to prevent any water or sewage from coming into contact with the concrete surface above.

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  • 40. 

    Size of cleanout for a 76 mm diameter pipe.

    • 64 mm

    • 76 mm

    • 51 mm

    • None of these.

    Correct Answer
    A. 64 mm
    Explanation
    The size of the cleanout for a 76 mm diameter pipe is 64 mm. A cleanout is a fitting that provides access to the interior of a pipe for cleaning or inspection purposes. In this case, the cleanout size is smaller than the pipe diameter, which is common to ensure a tight seal and prevent leaks. Therefore, the correct answer is 64 mm.

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  • 41. 

    Roof drains shall be equipped with strainers extending not less than ______ above the surface of the roof immediately adjacent to the drain.

    • 102 mm

    • 150 mm

    • 76 mm

    Correct Answer
    A. 102 mm
    Explanation
    Roof drains need to be equipped with strainers to prevent debris from clogging the drain system. These strainers should extend a certain distance above the surface of the roof to ensure effective filtering. In this case, the correct answer is 102 mm, meaning the strainers should extend at least 102 mm above the roof surface adjacent to the drain. This height allows for adequate filtration and prevents the drain from getting clogged with larger debris.

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  • 42. 

    In a caulked joint, the lead shall be caulked thoroughly at the inside and outside edges of the joint. After caulking, the finished joint shall not extend more than ________ below the rim of the hub.

    • 3.2 mm

    • 1.2 mm

    • 4.2 mm

    • 5.1 mm

    Correct Answer
    A. 3.2 mm
    Explanation
    In a caulked joint, the lead is caulked thoroughly at the inside and outside edges of the joint to ensure a watertight seal. After caulking, the finished joint should not extend more than 3.2 mm below the rim of the hub. This is important to prevent any water leakage or damage to the joint.

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  • 43. 

    Size of cleanout for 102 mm or larger diameter pipe.

    • 89 mm

    • 102 mm

    • Same as the inside diameter of the pipe

    • None of these

    Correct Answer
    A. 89 mm
    Explanation
    The correct answer is 89 mm. A cleanout is a pipe fitting that provides access to the inside of a pipe for cleaning or inspection purposes. In this case, for a pipe with a diameter of 102 mm or larger, the size of the cleanout is 89 mm. This means that the cleanout fitting will have a diameter of 89 mm, allowing for easy access to the inside of the pipe for maintenance or cleaning.

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  • 44. 

    Minimum trap diameter and dfu for Dental units or cuspidors.

    • 32mm and 1

    • 32mm and 2

    • 38mm and 2

    • 38mm and 1

    Correct Answer
    A. 32mm and 1
    Explanation
    The correct answer is 32mm and 1. This means that the minimum trap diameter required for dental units or cuspidors is 32mm, and the minimum drainage fixture unit (dfu) is 1. This indicates that the trap must have a diameter of at least 32mm to effectively drain waste from the dental units or cuspidors, and a dfu of 1 suggests that it can handle a relatively low volume of waste.

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  • 45. 

    Minimum trap diameter and dfu for floor drains.

    • 51mm and 2

    • 51mm and 3

    • 38mm and 2

    • 38mm and 3

    Correct Answer
    A. 51mm and 2
    Explanation
    The correct answer is 51mm and 2. This means that the minimum trap diameter for floor drains should be 51mm, and the Drainage Fixture Unit (dfu) should be 2. The trap diameter refers to the size of the trap, which is a curved section of pipe that prevents sewer gases from entering the building. The dfu is a measure of the drainage load that a fixture or group of fixtures places on the plumbing system. In this case, a floor drain should have a minimum trap diameter of 51mm and a dfu of 2 to effectively function.

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  • 46. 

    Minimum horizontal distance from septic tank to pressure public water main.

    • 3 m

    • 1.5 m

    • 15.2 m

    • 0.6 m

    Correct Answer
    A. 3 m
    Explanation
    The minimum horizontal distance from the septic tank to the pressure public water main should be 3 meters. This distance is important to ensure that there is enough space between the septic tank and the water main to prevent any potential contamination or damage to the water supply. A larger distance may be required to meet specific regulations or safety standards, but 3 meters is the minimum distance needed in this case.

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  • 47. 

    Minimum trap diameter and dfu for laundry tubs.

    • 38mm and 2

    • 38mm and 1

    • 51mm and 2

    • 51mm and 1

    Correct Answer
    A. 38mm and 2
    Explanation
    The correct answer is 38mm and 2. This means that the minimum trap diameter for laundry tubs should be 38mm and there should be 2 drainage fixture units (dfu) for the tubs. The trap diameter refers to the size of the pipe that traps and holds water to prevent sewer gases from entering the building. The dfu is a measure of the flow rate for a plumbing fixture. In this case, having 2 dfu means that the laundry tubs have a higher flow rate compared to options with only 1 dfu.

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  • 48. 

    Minimum trap diameter and dfu for Interceptors for grease, oil, etc.

    • 51mm and 3

    • 51mm and 2

    • 38mm and 2

    • 38mm and 3

    Correct Answer
    A. 51mm and 3
    Explanation
    The correct answer is 51mm and 3. This means that the minimum trap diameter for Interceptors for grease, oil, etc. should be 51mm and the design flow units (dfu) should be 3. This indicates that the interceptor should have a minimum diameter of 51mm to effectively trap and remove grease, oil, and other substances. Additionally, it should be designed to handle a flow rate equivalent to 3 dfu, which represents the expected amount of wastewater generated by a typical fixture or appliance.

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  • 49. 

    Minimum trap diameter and dfu for Interceptors for sand, auto wash, etc.

    • 76mm and 6

    • 76mm and 5

    • 51mm and 6

    • 51mm and 4

    Correct Answer
    A. 76mm and 6
    Explanation
    The correct answer is 76mm and 6. This means that the minimum trap diameter for Interceptors for sand, auto wash, etc. should be 76mm, and the design flow unit (dfu) should be 6. This indicates that a larger trap diameter is required to effectively capture sand and other debris, and a higher dfu is needed to handle the flow rate associated with these types of waste.

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Quiz Review Timeline (Updated): Mar 22, 2023 +

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

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 22, 2018
    Quiz Created by
    Catherine Halcomb
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