Master Plumber Pre-board Exam Part 2

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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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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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.