Master Plumber Pre-board Exam Part 2

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1. Storm water refers to _________.

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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About This Quiz
Master Plumber Pre-board Exam Part 2 - Quiz

This Master Plumber Pre-board Exam part 2 assesses essential skills in plumbing, focusing on tools, installation techniques, and code compliance. It is designed for individuals preparing for professional... see morecertification, enhancing both theoretical knowledge and practical application in plumbing. see less

2. A bidet is a plumbing fixture used for washing ______________.

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

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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4. What is the other word for toilet?

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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5. Where do you install a flushometer valve?

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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6. Where do you connect a downspout?

Explanation

A downspout is connected to a storm drain. A storm drain is a system of pipes and drains that collect and carry rainwater away from buildings and roads, preventing flooding. Connecting a downspout to a storm drain ensures that rainwater from the roof is directed away from the building and into the storm drain system. This helps to prevent water damage and maintain the integrity of the building's foundation. Connecting a downspout to a septic tank, cesspool, or privy would not be appropriate as these are systems for waste disposal, not rainwater drainage.

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7. What is the unit weight of water?

Explanation

The unit weight of water is 1000 kgs per cubic meter. This means that for every cubic meter of water, it weighs 1000 kilograms.

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8. An insanitary type of water closet. What is it?

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

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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10. Which of the following is NOT a commercial size of a galvanized steel pipe?

Explanation

The given options are all measurements for the size of a galvanized steel pipe. However, 2 3/4 ins. is not a standard commercial size for such pipes.

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

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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12. 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.

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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13. The abbreviation DWV stands for ____________.

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

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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15. An upright wye combination is a kind of ________.

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. The term stack applies to what type of pipe?

Explanation

The term "stack" refers to a type of pipe that is used for different purposes. In the context of plumbing, a stack can refer to a soil stack, which is a vertical pipe that carries waste from toilets and other soil-based plumbing fixtures. It can also refer to a waste stack, which carries waste from sinks, showers, and other non-soil plumbing fixtures. Additionally, a stack can refer to a vent stack, which is a pipe that helps to regulate air pressure in the plumbing system and prevent the buildup of gases. Therefore, the correct answer is that the term stack applies to all of these types of pipes.

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

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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18. Plastic pipes are manufactured from ___________.

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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19. Which among the plumbing practices is prohibited under the code?

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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20. What type of copper tube is the heaviest?

Explanation

Type K copper tube is the heaviest because it has the thickest walls compared to the other types. The thickness of the walls in Type K copper tube allows it to withstand higher pressures and makes it suitable for underground and water distribution systems. Type L and Type M copper tubes have thinner walls and are used for general plumbing purposes. Type DWV (Drain, Waste, and Vent) copper tube is specifically designed for drainage and waste systems and has even thinner walls compared to the other types.

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21. The following are the types of copper tubes EXCEPT __________.

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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22. The other name of hub.

Explanation

The correct answer is "Bell" because a bell is another name for a hub. A bell is a device that connects multiple devices or nodes in a network, allowing them to communicate with each other. It acts as a central point for data transmission and distribution. Therefore, "Bell" is the correct answer as it is synonymous with a hub in the context of networking.

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

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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24. An objectionable type of trap.

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

Explanation

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

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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27. What causes the bad taste and odor of water?

Explanation

Algae can cause a bad taste and odor in water. Algae growth in water bodies is common and can be triggered by factors like warm temperatures, sunlight, and nutrient-rich conditions. When algae blooms occur, they release certain compounds that can give water an unpleasant taste and odor. These compounds can include geosmin and methylisoborneol, which are responsible for the earthy and musty smells often associated with algae-contaminated water. Therefore, the presence of algae is a likely cause of the bad taste and odor in water.

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28. Water for domestic use comes from these sources except

Explanation

Sea water is not a viable source for domestic use as it is highly saline and requires desalination processes to make it suitable for consumption. Ground water, rain water, and surface water, on the other hand, are commonly used sources for domestic water supply.

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

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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30. To boost the water pressure of hot water, use

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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31. To boost the water pressure of hot water, use

Explanation

A circulating pump is used to boost the water pressure of hot water. Unlike an elevated water tank, hydroelectric tank, or gravity tank, a circulating pump actively moves the water, creating a continuous flow and increasing the pressure. This is especially useful in situations where the natural pressure is low or when there is a need for consistent and strong water pressure.

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32. It is used to remove external and internal burrs resulting from cutting of pipes.

Explanation

A combination reamer is a tool used to remove both external and internal burrs that occur during the cutting of pipes. This tool is designed specifically for this purpose and is effective in smoothing out the rough edges left after cutting. It is a versatile tool that can be used on various types of pipes and is commonly used in plumbing and metalworking applications. The combination reamer helps to ensure a clean and smooth finish on the pipes, improving their functionality and appearance.

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33. Every exposed trap must _________.

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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34. Waste in plumbing drainage are prohibited waste when you discharge

Explanation

Toxic waste is prohibited in plumbing drainage because it can be harmful to the environment and human health. Toxic waste contains substances that are poisonous or can cause serious health issues if exposed to them. Discharging toxic waste into plumbing drainage can contaminate water sources, pollute ecosystems, and pose a risk to both aquatic life and humans. Therefore, it is crucial to handle and dispose of toxic waste properly through specialized methods to prevent any negative impacts on the environment and public health.

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35. A male thread fitting with square head used for closing another female fitting

Explanation

A plug is a male thread fitting with a square head that is used for closing another female fitting. It is designed to fit securely into the female fitting, creating a tight seal and preventing any leakage or flow. Plugs are commonly used in plumbing and piping systems to close off unused or temporary connections. They are easy to install and remove, making them a convenient option for closing off fittings when needed.

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36. Which of the following is not a sanitary drainage fitting?

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

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

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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39. What is the standard length of uPVC plastic or synthetic pipe?

Explanation

uPVC plastic or synthetic pipes typically have a standard length of 3000 mm. This length is commonly used in various applications such as plumbing, drainage, and irrigation systems. It is a convenient length that allows for easy installation and handling. Other lengths mentioned in the options (2000 mm, 4000 mm, and 5000 mm) may also be used in specific cases, but the standard length is 3000 mm.

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

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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41. Which of the following galvanized iron pipes is the heaviest?

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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42. Wastewater flushed out of water closet or urinal is known ___________.

Explanation

The wastewater flushed out of a water closet or urinal is known as black water. This term is used to refer to wastewater that contains fecal matter and is highly contaminated. Black water is typically treated separately from other types of wastewater due to its high level of pollutants and potential health risks.

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43. What is the minimum size of water supply inlet for a shower stall?

Explanation

The minimum size of water supply inlet for a shower stall is 1/2". This is because a larger size, such as 3/2" or 1/4", would result in too much water pressure and flow, which could be uncomfortable or even dangerous. On the other hand, a smaller size, like 3/8", may not provide enough water pressure for a satisfying shower experience. Therefore, 1/2" is the appropriate size for a water supply inlet for a shower stall.

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44. Gases not found in sewer air of septic tanks

Explanation

Chloride gas is not found in sewer air of septic tanks. Chloride is a negatively charged ion that is commonly found in salts, such as sodium chloride (table salt). It is not typically present in gaseous form in sewer air. On the other hand, carbon monoxide, ammonia, and methane gas can be found in sewer air due to various biological and chemical processes.

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

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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46. The following are examples of sanitary wares EXCEPT __________.

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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47. What is the correct order of valves or devices in a water service and building supply system from the water main?

Explanation

In a water service and building supply system, the correct order of valves or devices from the water main is gate valve, water meter, check valve. The gate valve is typically the first valve in the system, allowing for the control of water flow. The water meter is then installed to measure the amount of water being used. Finally, the check valve is placed to prevent the backflow of water, ensuring that water only flows in one direction.

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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?

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. What is the minimum size of water supply inlet for the kitchen sink?

Explanation

The minimum size of water supply inlet for a kitchen sink is 1/2". This is because a larger size is needed to provide enough water flow for tasks such as washing dishes and filling pots. A smaller size, such as 1/4" or 3/8", would restrict the water flow and make it difficult to use the sink effectively. The option of 3/2" is not a standard size and is not commonly used for water supply inlets.

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50. A horizontal pipe is a pipe that makes an angle of ____________.

Explanation

A horizontal pipe is a pipe that is inclined at an angle of not more than 45 degrees with the horizontal. This means that the pipe is tilted upward but not at a steep angle. It could be parallel to the ground or slightly inclined. It cannot be more than 45 degrees as that would make it inclined at a steeper angle than what is considered horizontal.

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51. When silt and dirt is removed from water, the process is called

Explanation

Filtration is the process of removing silt and dirt from water. It involves passing the water through a filter medium, such as sand or activated carbon, which traps and removes the particles. Sedimentation refers to the process of allowing the particles to settle at the bottom of a container. Siltation refers to the accumulation of silt in a body of water. Screening involves using a mesh or screen to physically separate larger particles from the water.

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52. 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.

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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53. A pop waste can be found in a ______________.

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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54. What do you call this valve installed at the suction line of a pump to prevent the loss of prime of the pump?

Explanation

A foot valve is a type of valve that is installed at the suction line of a pump to prevent the loss of prime. It is designed to only allow fluid flow in one direction, preventing backflow and ensuring that the pump remains primed. This valve is commonly used in applications where the pump is located above the fluid level and there is a risk of losing prime due to gravity or other factors.

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55. Polyvinyl chloride pipe (PVC) pipes used for drain waste vent (DWV) are manufactured based on the standard set by this organization.

Explanation

ASTM stands for the American Society for Testing and Materials. They are responsible for setting the standards for the manufacturing of various materials, including PVC pipes used for drain waste vent (DWV). The ASTM standards ensure that the PVC pipes meet specific criteria for quality, durability, and safety. Therefore, the correct answer is ASTM.

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56. What type of PVC pipe is used on sanitary drainage system?

Explanation

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57. The most common and widely used gate valve

Explanation

A single disk gate valve is the most common and widely used type of gate valve. It is designed with a single disk that moves up and down to control the flow of fluids. This type of valve is known for its simplicity and reliability, making it suitable for a variety of applications. The single disk design allows for easy operation and maintenance, and it provides a tight seal when closed, preventing any leakage. Overall, the single disk gate valve is a popular choice due to its effectiveness and versatility.

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58. How many cubic inches are there in a cubic foot?

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

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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60. What is the the other word for vent stack?

Explanation

The other word for vent stack is a main vent.

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61. Galvanized steel pipes are generally measured by its _____________.

Explanation

Galvanized steel pipes are generally measured by their inside diameter. This refers to the measurement of the inner space or the diameter of the hollow section of the pipe. It is an important parameter for determining the flow capacity and compatibility with fittings and connectors. The inside diameter measurement is crucial for ensuring proper installation and functionality of the pipes in plumbing or construction applications.

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62. Using the equation, Q=Av, calculate the discharge rate of fluid inside a pipe having an inside diameter of 250 mm and a velocity of 5 m/s.

Explanation

The equation Q=Av is used to calculate the discharge rate of fluid in a pipe, where Q is the discharge rate, A is the cross-sectional area of the pipe, and v is the velocity of the fluid. In this case, the inside diameter of the pipe is given as 250 mm, which can be used to calculate the cross-sectional area. The velocity of the fluid is given as 5 m/s. By substituting these values into the equation, we can calculate the discharge rate, which is 0.245 cu.m. per sec.

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63. A word synonymous with P-trap. What is it?

Explanation

A gooseneck is a word synonymous with a P-trap. It refers to the curved section of a plumbing trap that resembles the neck of a goose. This shape is designed to prevent sewer gases from entering a building while allowing water to flow freely.

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

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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65. This tool is used to cut external threads of a pipe.

Explanation

A pipe threader is a tool specifically designed to cut external threads on a pipe. It is used to create a threaded connection on the outside of the pipe, allowing it to be securely attached to other pipes or fittings. This tool typically consists of a die head that is rotated around the pipe, cutting the threads as it moves along. The pipe threader is essential in plumbing and pipefitting applications, as it ensures a tight and secure connection between pipes, preventing leaks and ensuring the overall integrity of the system.

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

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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67. What type of vent is used in conjunction with loop vent?

Explanation

A circuit vent is used in conjunction with a loop vent. A loop vent is a type of venting system that is used to provide proper air circulation and prevent the buildup of pressure in the plumbing system. It consists of a looped pipe that connects multiple fixtures, allowing air to flow freely and equalize pressure. A circuit vent, on the other hand, is a vent pipe that connects to the loop vent and extends vertically to the roof, allowing for the release of sewer gases. Therefore, a circuit vent is the correct type of vent used in conjunction with a loop vent.

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68. The simplest and cheapest bonnet design of valve is

Explanation

The correct answer is "screwed." This means that the simplest and cheapest bonnet design of a valve is the one that is screwed. This design involves using screws to secure the bonnet to the valve body, providing a reliable and cost-effective solution.

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69. A kind of well dug with earth augers, are usually less than 30 meters (100 feet) deep. They are used when the earth to be bored is boulder free and will not cave in. The diameter ranges from 2 to 30 inches. The well is lined with metal, vitrified tile or concrete.What is it?

Explanation

A bored well is a type of well that is dug using earth augers. These wells are typically shallow, usually less than 30 meters deep, and are suitable for earth that is free of boulders and will not collapse. The diameter of a bored well can range from 2 to 30 inches. To prevent the well from collapsing, it is lined with materials such as metal, vitrified tile, or concrete. Therefore, the correct answer is "Bored well."

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

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

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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72. The common heat source for indirect water heater 

Explanation

Steam is the common heat source for indirect water heaters because it has high heat transfer capabilities and can efficiently heat large volumes of water. Steam is commonly used in industrial settings where large amounts of hot water are required, such as in hospitals, hotels, and laundries. It is a cost-effective and energy-efficient option for heating water, as it can be generated from various sources such as boilers or waste heat recovery systems. Additionally, steam can be easily controlled and distributed throughout a building, making it a reliable choice for indirect water heating systems.

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73. Electric water heaters are manufactured based on the standard set by this organization

Explanation

Electric water heaters are manufactured based on the standard set by the U.L. organization. U.L. stands for Underwriters Laboratories, which is a global safety science company that sets standards for various industries, including electrical products. Their standards ensure that electric water heaters meet safety and performance requirements, ensuring that they are reliable and safe to use.

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74. Screwed steel pipe 2 1/2" diam. should have this number of threads for effective jointing

Explanation

The correct answer is 8 because for effective jointing, screwed steel pipes of 2 1/2" diameter should typically have 8 threads. These threads help to securely connect and seal the pipes together, ensuring a strong and leak-free joint. Having the appropriate number of threads is crucial for the overall integrity and functionality of the joint.

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

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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76. The following types of filtration process for water EXCEPT ____________.

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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77. Which of the following materials is NOT used in caulking?

Explanation

Flange is not used in caulking. Caulking is a process of sealing joints or gaps in various materials to prevent the passage of air, water, or other substances. Runner, oakum, and lead are commonly used materials in caulking. However, a flange is a projecting rim or edge used to strengthen or attach objects, and it is not typically used in the caulking process.

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78. What is the other word for plumber's friend?

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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79. What is the setting distance from the floor for a bidet waste drain outlet?

Explanation

The correct answer is 12". The setting distance from the floor for a bidet waste drain outlet is typically 12 inches. This measurement ensures proper installation and functionality of the bidet waste drain system.

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80. What tool is aptly used to remove or tighten the head of a plug?

Explanation

A crescent wrench is the most suitable tool for removing or tightening the head of a plug. It is an adjustable wrench with a movable jaw, allowing it to fit different sizes of nuts and bolts. The crescent wrench has a wide opening that can accommodate the head of a plug, providing a secure grip for tightening or loosening it. This tool is commonly used in plumbing and mechanical work to handle various tasks, making it the best choice for this particular job.

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81. The recommended hot water supply to a hotel lavatory

Explanation

The recommended hot water supply to a hotel lavatory is 5 GPH. This is the most suitable option because it provides a sufficient amount of hot water for regular use in a hotel lavatory. It strikes a balance between providing enough hot water for guests' needs without wasting excessive amounts of water. A higher GPH may lead to wastage, while a lower GPH may not meet the demand for hot water in a hotel lavatory. Therefore, 5 GPH is the optimal choice for an efficient and effective hot water supply in this scenario.

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

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

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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84. What testing method is most recommended for sanitary piping system?

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

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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86. In plumbing, what is the purpose of a P-trap installed under sinks?

Explanation

A P-trap is a curved section of plumbing pipe that retains a small amount of water after each use. This retained water acts as a seal that blocks sewer gases from rising up through the sink drain into the home. Without this barrier, harmful and unpleasant odors could permeate living spaces, posing health risks and discomfort. Thus, the P-trap is crucial for maintaining a sanitary and odor-free environment.

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87. The effective thread length of a 3/4" diam. screwed steel pipe is

Explanation

The effective thread length of a 3/4" diameter screwed steel pipe is 3/4" long. This means that the threaded portion of the pipe, which is used to connect it to other pipes or fittings, is 3/4" in length.

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88. Which of the following is the earliest model of water closet?

Explanation

The high tank is the earliest model of water closet. This type of toilet features a tank that is mounted high on the wall, allowing gravity to assist in flushing the waste down into the bowl. It was commonly used in the past before modern plumbing systems were developed. The high tank toilet is known for its vintage and classic design, often seen in older buildings and historical homes.

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89. Where do you use a crowfoot?

Explanation

A crowfoot is a type of fitting that is commonly used in plumbing systems, specifically in sanitary piping systems. It is used to connect pipes at a right angle, allowing for the flow of waste or sewage in a sanitary plumbing system. This fitting is designed to prevent leaks and ensure the proper functioning of the system. Therefore, the correct answer is sanitary piping system.

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90. A typical compression type tap is generally made of what kind of valve?

Explanation

A typical compression type tap is generally made of a globe valve. Globe valves are commonly used in plumbing systems as they provide a good seal and control the flow of water. They have a spherical body with an internal baffle that directs the flow of water. This design allows for precise regulation of water flow and pressure, making globe valves suitable for use in taps where controlling the flow is important.

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

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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92. What is the minimum size of water supply inlet for a urinal stall

Explanation

The correct answer is 3/4". This is because a urinal stall requires a sufficient amount of water supply to effectively flush waste. A 3/4" water supply inlet ensures an adequate flow of water to properly clean the urinal. A smaller size, such as 1/2" or 1/4", may not provide enough water pressure to effectively flush waste, leading to potential hygiene issues. A larger size, such as 1", may result in excessive water usage, which is not efficient. Therefore, 3/4" is the minimum size required for a water supply inlet in a urinal stall.

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93. What material property characterizes cast iron pipe?

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

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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95. What is the setting height from the floor for a wall hung lavatory water supply inlet?

Explanation

The correct answer is 22". The height from the floor for a wall hung lavatory water supply inlet is typically 22 inches. This measurement is standard and ensures proper installation and functionality of the lavatory.

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96. The recommended hot water supply an hotel washing machine is

Explanation

The recommended hot water supply for a hotel washing machine is 20 GPH. This means that the machine should receive a flow rate of 20 gallons per hour of hot water. This is the ideal amount of hot water needed to effectively wash the hotel's laundry.

Submit
97. What type of vent system is used on a single fixture?

Explanation

A revent is a type of vent system that is used on a single fixture. It is a separate vent pipe that connects to the drain line of the fixture, allowing air to enter and prevent the trap from being siphoned. This type of vent system is commonly used when there are space constraints or when it is not possible to connect the fixture to a main vent stack.

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98. What is the setting height from the floor for a water supply inlet of a flush tank water closet

Explanation

The correct answer is 8". The water supply inlet of a flush tank water closet is typically set at a height of 8 inches from the floor. This allows for proper water flow and ensures that the tank can fill up efficiently.

Submit
99. The recommended hot water supply to a therapeutic bath

Explanation

The recommended hot water supply to a therapeutic bath is 100 GPH. This means that the bath should receive a flow rate of 100 gallons per hour of hot water. This amount is considered optimal for providing a comfortable and effective therapeutic experience. It ensures that the bath is adequately filled with hot water, allowing the individual to fully immerse themselves and benefit from the therapeutic properties of the water. A higher flow rate may result in excessive water consumption and potential discomfort, while a lower flow rate may not provide enough water for a satisfying bath.

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

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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Storm water refers to _________.
A bidet is a plumbing fixture used for washing ______________.
What is the recommended slope percentage of horizontal drainage pipe...
What is the other word for toilet?
Where do you install a flushometer valve?
Where do you connect a downspout?
What is the unit weight of water?
An insanitary type of water closet. What is it?
Choose from the list the best type of sewage disposal system.
Which of the following is NOT a commercial size of a galvanized steel...
As defined, a floor drain is considered a/an ________.
A term used to describe the installation of pipes, fittings, devices...
The abbreviation DWV stands for ____________.
Which of the following is used to achieve change in direction?
An upright wye combination is a kind of ________.
The term stack applies to what type of pipe?
Which of the following materials is not recommended for water supply...
Plastic pipes are manufactured from ___________.
Which among the plumbing practices is prohibited under the code?
What type of copper tube is the heaviest?
The following are the types of copper tubes EXCEPT __________.
The other name of hub.
Which fitting or fitting combination is best used at the base of a...
An objectionable type of trap.
In a trap, what do you call the vertical distance between the top dip...
Technically, which of the following is considered a plumbing...
What causes the bad taste and odor of water?
Water for domestic use comes from these sources except
Which plumbing principle is contrary to established principles as...
To boost the water pressure of hot water, use
To boost the water pressure of hot water, use
It is used to remove external and internal burrs resulting from...
Every exposed trap must _________.
Waste in plumbing drainage are prohibited waste when you discharge
A male thread fitting with square head used for closing another female...
Which of the following is not a sanitary drainage fitting?
Calculate the volume of a cylindrical tank having a diameter of 1...
DFU is a abbreviation used in sizing what part of the plumbing system?
What is the standard length of uPVC plastic or synthetic pipe?
The size of storm drainage system is dependent on the following items...
Which of the following galvanized iron pipes is the heaviest?
Wastewater flushed out of water closet or urinal is known ___________.
What is the minimum size of water supply inlet for a shower stall?
Gases not found in sewer air of septic tanks
A tool used to make watertight joints between flexible copper tubing...
The following are examples of sanitary wares EXCEPT __________.
What is the correct order of valves or devices in a water service and...
What is the volume of swimming pool with the following dimensions :...
What is the minimum size of water supply inlet for the kitchen sink?
A horizontal pipe is a pipe that makes an angle of ____________.
When silt and dirt is removed from water, the process is called
What do you call that portion of the drainage system which cannot...
A pop waste can be found in a ______________.
What do you call this valve installed at the suction line of a pump to...
Polyvinyl chloride pipe (PVC) pipes used for drain waste vent (DWV)...
What type of PVC pipe is used on sanitary drainage system?
The most common and widely used gate valve
How many cubic inches are there in a cubic foot?
Which of the following fixture group qualifies the definition of...
What is the the other word for vent stack?
Galvanized steel pipes are generally measured by its _____________.
Using the equation, Q=Av, calculate the discharge rate of fluid inside...
A word synonymous with P-trap. What is it?
A 1/4 bend is a fitting having an angle equivalent to __________.
This tool is used to cut external threads of a pipe.
What do you call a type of backflow preventing device used on water...
What type of vent is used in conjunction with loop vent?
The simplest and cheapest bonnet design of valve is
A kind of well dug with earth augers, are usually less than 30 meters...
The flow of water in a pipe is affected by the following conditions...
Which type of ventilation system is installed along soil stacks and...
The common heat source for indirect water heater 
Electric water heaters are manufactured based on the standard set by...
Screwed steel pipe 2 1/2" diam. should have this number of...
Which of the following joint types is commonly used on galvanized...
The following types of filtration process for water EXCEPT...
Which of the following materials is NOT used in caulking?
What is the other word for plumber's friend?
What is the setting distance from the floor for a bidet waste drain...
What tool is aptly used to remove or tighten the head of a plug?
The recommended hot water supply to a hotel lavatory
Which in the list considered the most efficient type of venting...
What is the minimum fixture drain size of a wash basin?
What testing method is most recommended for sanitary piping system?
Which of the following does not directly affect the size of a sanitary...
In plumbing, what is the purpose of a P-trap installed under sinks?
The effective thread length of a 3/4" diam. screwed steel pipe is
Which of the following is the earliest model of water closet?
Where do you use a crowfoot?
A typical compression type tap is generally made of what kind of...
This tool is used to extract pipes 1 to 2 inches nipple.
What is the minimum size of water supply inlet for a urinal stall
What material property characterizes cast iron pipe?
What do you call the supply pipe between the fixture and the water...
What is the setting height from the floor for a wall hung lavatory...
The recommended hot water supply an hotel washing machine is
What type of vent system is used on a single fixture?
What is the setting height from the floor for a water supply inlet of...
The recommended hot water supply to a therapeutic bath
All plumbing fixtures listed below are included under the definition...
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