Quiz About Plumbing 1

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1. A kind of G.I. fitting that has one end external threads, while the other end has internal threads.
- STREET ELBOW or TEE
- Wye
- Elbow

About This Quiz

This Quiz about Plumbing 1 assesses key skills in identifying and understanding various plumbing fittings and systems. It covers G. I. Fittings, valves, and water system components, crucial for anyone training in or working within the plumbing industry.

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2.
1. A kind of G.I. fitting used as a reducer from a bigger diameter to a lesser diameter.
- Bushing
- Reducer
- Fitting
Correct Answer

A. Bushing

Explanation

A bushing is a type of G.I. fitting that is used to reduce the diameter of a pipe or conduit. It is typically used when there is a need to connect a larger diameter pipe or conduit to a smaller diameter one. The bushing fits into the larger diameter opening and provides a smaller diameter opening for the connection. This helps to ensure a secure and tight fit between the two pipes or conduits.

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1
3.
1. A stop valve in a service pipe close to its connection with a water main.
- Gate valve
- Corporation cock
- Check valve
- Globe valve
Correct Answer

A. Corporation cock

Explanation

A corporation cock is a type of valve that is commonly used in service pipes near their connection with a water main. It is designed to regulate or stop the flow of water in the pipe. This type of valve is typically used in municipal water systems and is known for its durability and reliability.

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4.
1. One end is 0.30M and the other end is 0.90M long. This prevents the pipe from snapping (breaking?)when the soil settles. [U-shaped?]
- Gooseneck
- Corporation cock
- Ball cock
- Long neck
Correct Answer

A. Gooseneck

Explanation

A gooseneck is a curved pipe or tube that is commonly used in plumbing to create a U-shape. In this context, a gooseneck is used to prevent the pipe from snapping or breaking when the soil settles. The length of the gooseneck is not mentioned, but it is implied that it is longer than the pipe itself, with one end being 0.30M and the other end being 0.90M long. Therefore, the gooseneck is the correct answer as it fits the description provided.

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5.
1. refers to the public water system laid underground along the streets where the house service is connected.
- Main service
- Water source
- Water main
Correct Answer

A. Water main

Explanation

The correct answer is "water main" because it refers to the public water system laid underground along the streets where the house service is connected. This is the main source of water for the houses connected to the system.

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6.
1. These valves are used when it is desired that the flow through a pipe be always in one direction and there is a possibility of a flow taking place in the opposite direction. One type has a pivoted flap which is readily pushed open by the pressure of water from one side but is tightly closed by the force of a reverse flow.
- Gatevalves
- Checkvalves
- Globe valves
Correct Answer

A. Checkvalves

Explanation

Check valves are used when it is desired to have a one-directional flow in a pipe. They have a pivoted flap that can easily be pushed open by the pressure of water from one side, allowing flow in that direction. However, when there is a reverse flow, the force of the water tightly closes the flap, preventing flow in the opposite direction. This makes check valves suitable for preventing backflow and ensuring that the flow remains in one direction.

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7.
1. To insure no leakage, a G.I. pipe when threaded has to use lead liquid or ______ tape around the thread before tightening the fittings.
- Solvent
- Teflon
- Packaging
- Electrical
Correct Answer

A. Teflon

Explanation

To ensure no leakage, a G.I. pipe when threaded requires the use of lead liquid or teflon tape around the thread before tightening the fittings. Teflon tape is commonly used in plumbing applications as it provides a tight seal and prevents leaks. It is a thin, white tape made of polytetrafluoroethylene (PTFE) and is highly resistant to chemicals and heat. When wrapped around the threaded portion of the pipe, it fills in any gaps or imperfections, creating a secure and watertight connection.

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8.

1. A slow draining of water from a fixture down a plumbing system indicates a poor venting system. This poor venting system is caused by:
- A. Over loaded fixture unit in the soil stack
- B. Change in the atmospheric pressure in the pipe
- C. Wrong choice of vent type
- D. Inadequate drain pipe
Correct Answer

A. C. Wrong choice of vent type
9.

1. A term used for a pipe extension of not more than 2 feet in length, installed at any stack or branch of a plumbing rough-in for the purpose future tap.
- A. tail piece
- B. branch
- C. clean out
- D. stub out
Correct Answer

A. A. tail piece

Explanation

A tail piece is a pipe extension that is not more than 2 feet in length and is installed at a stack or branch of a plumbing rough-in. It is used for the purpose of a future tap, meaning that it allows for the installation of a faucet or other plumbing fixture at a later time.

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10.

1. A type of pump which comprises essentially an impeller or set of vanes enclosed in a housing or casing close coupled with the pump motor. Its fundamental principle is it adds energy in the form of velocity to an already flowing liquid.
- A. reciprocating pump
- B. centrifugal pump
- C. piston pump
- D. turbine pump
Correct Answer

A. B. centrifugal pump

Explanation

A centrifugal pump is a type of pump that consists of an impeller or set of vanes enclosed in a housing or casing, which is close coupled with the pump motor. The pump operates on the principle of adding energy in the form of velocity to a liquid that is already flowing. This increased velocity creates a pressure difference, allowing the pump to move the liquid from one location to another.

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11.

1. A vent used in a battery of plumbing fixtures where the vent is installed in front of the last fixture of the battery.
- A. yoke vent
- B. circuit vent
- C. stack vent
- D. relief vent
Correct Answer

A. B. circuit vent

Explanation

A circuit vent is a vent that is installed in front of the last fixture in a battery of plumbing fixtures. It helps to equalize air pressure in the plumbing system and prevent siphoning of water from traps.

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12.

1. Any pipe in the plumbing system provided to ventilate a house drainage system and to prevent trap siphonage and back pressure.
- A. waste pipe
- B. vent pipe
- C. soil pipe
- D. house trap
Correct Answer

A. B. vent pipe

Explanation

A vent pipe is a pipe in the plumbing system that is used to ventilate a house drainage system and prevent trap siphonage and back pressure. It allows air to enter the pipes, which helps to equalize pressure and prevent water from being siphoned out of traps or creating pressure that could damage the system. The vent pipe plays an important role in maintaining the proper functioning of the plumbing system and ensuring that waste water flows properly.

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1
13.

1. Single lever valves used in kitchen sink and lavatory faucets or at shower valves has gain popularity in plumbing installation today. This is because these valves are beautiful and are maintenance-free. These valves work by the principle of a:
- A. gate valve
- B. angle valve
- C. ball valve
- D. globe valve
Correct Answer

A. C. ball valve

Explanation

Ball valves are gaining popularity in plumbing installations because they are beautiful and maintenance-free. They work by the principle of a ball inside the valve that controls the flow of water. When the lever is turned, the ball rotates to either block or allow water to pass through the valve. This design allows for a quick and easy on/off operation and provides a reliable and durable solution for controlling water flow in kitchen sink and lavatory faucets or shower valves.

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14.

1. What is a type of vent applied on installations with multi-branch interval where the vertical vent pipe takes off in front of the first fixture and connects to a main vent stack?
- A. Relief vent
- B. Yoke vent
- C. Loop vent
- D. Circuit vent
Correct Answer

A. B. Yoke vent

Explanation

A yoke vent is a type of vent applied on installations with multi-branch interval where the vertical vent pipe takes off in front of the first fixture and connects to a main vent stack. This allows for proper venting and prevents the possibility of airlock or siphoning in the drainage system.

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15.

-can be constructed with hand tools or power tools-depth of about 15 meters (50 ft)-can have the greatest diameter that a space may allow
- DUG WELLS
- DEEP WELLS
- HOLE WELLS
- FOX HOLE
Correct Answer

A. DUG WELLS

Explanation

Dug wells are the correct answer because they can be constructed with hand tools or power tools, which implies that they can be built using basic equipment. Additionally, the fact that they can have a depth of about 15 meters suggests that they can reach a significant depth for accessing water. Lastly, the statement that they can have the greatest diameter that a space may allow indicates that dug wells can be customized to fit the available space, making them a versatile option for accessing groundwater.

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16.

. The vertical supply pipe which extends upward from one floor to the next is called a_________
- Service pipe
- Riser
- Vent
- Stack vent
Correct Answer

A. Riser

Explanation

A vertical supply pipe that extends upward from one floor to the next is called a riser. This pipe is responsible for delivering water or other fluids to the different levels of a building. It allows for efficient distribution of resources and ensures that each floor has access to the necessary supply.

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17.

. Water is treated by giving ________________ to kill the harmful bacteria present and to cure the turbid taste or “mud taste”, remove clay, salts, iron, etc. commonly used treating liquids is chlorine.
- Chemical powder
- Chemical treatments
- Bacteria
Correct Answer

A. Chemical treatments

Explanation

Water is treated by using chemical treatments to kill harmful bacteria and improve its taste. One commonly used chemical treatment is chlorine, which helps to remove clay, salts, iron, and other impurities.

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18.

. A reservoir, tank or vessel for storing or holding water or other liquids
- CISTERN/ CISTERN TANK
- WATER TANK
- WATER DAM
- COFERDAM
Correct Answer

A. CISTERN/ CISTERN TANK

Explanation

A cistern or cistern tank is a reservoir, tank, or vessel used for storing or holding water or other liquids. It is specifically designed for the purpose of storing and supplying water. A water tank can also be used for this purpose, but the term "cistern" is more commonly used to refer to a tank specifically for water storage. A water dam, on the other hand, is a structure built across a river or stream to impound water. A coferdam is a temporary structure used to divert water or create a dry work area.

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19.

. Water is distributed from the normal water pressure coming from the public water main, for low rise buildings.
- UPFEED SYSTEM
- DOWN FEED SYSTEM
- PRESSURE SYSTEM
- DIRECT SYSTEM
Correct Answer

A. UPFEED SYSTEM

Explanation

An upfeed system is a method of distributing water in low-rise buildings by utilizing the normal water pressure from the public water main. In this system, water is pumped from the main supply and distributed to the upper floors of the building via vertical pipes. This allows for efficient and effective water distribution throughout the building, ensuring that all floors have access to sufficient water pressure.

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20.

. By gravity, water is distributed from overhead water tanks and is supported either by structural frames or on the roof decks. Fixtures are below the gravity tank. These elevated tanks are installed when normal water supply from main public service pipes is not frequent and when normal pressure from city main is not enough to force the water to the highest fixtures.
- UPFEED SYSTEM
- DOWN FEED SYSTEM
- PRESSURE SYSTEM
- DIRECT SYSTEM
Correct Answer

A. DOWN FEED SYSTEM

Explanation

A down feed system is the correct answer because it describes a water distribution system where water is supplied from an overhead tank and flows downward to the fixtures. This system is used when the water supply from the main pipes is not frequent and the pressure from the city main is not sufficient to reach the highest fixtures.

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21.

1. A device used to control an incoming high water pressure into the water distribution system by mechanical means so as to bring it to a working pressure of 80 psi.
- A. Pressure relief valve
- B. Pressure reducer
- C. Pressure reducing valve
- D. Pressure regulator
Correct Answer

A. C. Pressure reducing valve

Explanation

A pressure reducing valve is a device used to control high water pressure by reducing it to a working pressure of 80 psi. It does this through mechanical means, ensuring that the water distribution system is not subjected to excessive pressure.

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22.

1. A female GI pipe reducer fitting used in a straight pipe connection where the fitting’s both ends are threaded inside
- A. coupling reducer
- B. bushing reducer
- C. elbow reducer
- D. tee reducer
Correct Answer

A. A. coupling reducer

Explanation

A female GI pipe reducer fitting is used in a straight pipe connection where the fitting's both ends are threaded inside. The correct term for this type of fitting is a coupling reducer. A coupling is a type of fitting that is used to connect two pipes of the same diameter together in a straight line. The reducer part of the fitting indicates that it is used to reduce the size of the pipe, typically from a larger diameter to a smaller diameter. Therefore, the correct answer is A. coupling reducer.

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23.

1. A female GI threaded pipe reducer fitting use to connect a reducing branch from a main water distribution.
- A. bell reducer
- B. tee reducer
- C. elbow reducer
- D. coupling reducer
Correct Answer

A. B. tee reducer

Explanation

The correct answer is B. tee reducer. A tee reducer is a type of pipe fitting that is used to connect a reducing branch from a main water distribution. It has three openings, with one being smaller in size than the other two, allowing for the connection of pipes of different sizes. This type of fitting is commonly used in plumbing systems to join pipes and create a branch connection.

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24.

1. A female GI threaded pipe reducer fitting use to connect a reducing branch pipe at an angle.
- A. Elbow reducer
- B. Bushing reducer
- C. Coupling reducer
- D. Tee reducer
Correct Answer

A. A. Elbow reducer

Explanation

The correct answer is A. Elbow reducer. An elbow reducer is a type of threaded pipe fitting that is used to connect a reducing branch pipe at an angle. It is called an elbow because it has a curved shape, resembling the angle of an elbow. This fitting is commonly used in plumbing and pipe systems to redirect the flow of fluids or gases.

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25.

G1. A fitting installed at a branching tee from a horizontal soil branch to a horizontal waste branch.
- A. 4”x2” Wye and 2 1/8” bend combination
- B. 4”x4” Tee
- C. 4”x2” Tee
- D. 4”x4” Wye and 4 1/8” bend combination
Correct Answer

A. D. 4”x4” Wye and 4 1/8” bend combination

Explanation

The correct answer is D. 4”x4” Wye and 4 1/8” bend combination. This fitting is installed at a branching tee from a horizontal soil branch to a horizontal waste branch. The 4”x4” Wye allows for the connection of two 4-inch pipes, while the 4 1/8” bend provides the necessary angle for the connection. This combination fitting is suitable for this specific installation scenario.

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26.

1. A suitable and economical type of water pump for a 200 ft. driven wall to deliver 10gpm against 200 ft. The Develop Height (TDH) where the motor and pump is located is at the surface.
- A. sump pump
- B. jet pump
- C. submersible pump
- D. turbine pump
Correct Answer

A. B. jet pump

Explanation

A jet pump would be a suitable and economical type of water pump for this scenario because it is capable of delivering water against a high total dynamic head (TDH) of 200 ft. The fact that the motor and pump are located at the surface also supports the use of a jet pump, as it can draw water from a shallow well or other water source. A jet pump uses a combination of suction and pressure to move water, making it an efficient choice for this situation.

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27.

1. A type of pump for driven well from 150 ft to 200 ft which works by a principle of venturi where water of high pressure is pump into the well to draw water upwards through the return pipe.
- A. submersible pump
- B. jet pump
- C. jack or piston pump
- D. reciprocating pump
Correct Answer

A. B. jet pump

Explanation

A jet pump is the correct answer because it is a type of pump that can be used for driven wells from 150 ft to 200 ft. It operates on the principle of venturi, where water under high pressure is pumped into the well to create a suction force that draws water upwards through the return pipe. This type of pump is commonly used for wells where the water level is relatively shallow.

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28.

1. A type of pump which delivers high water discharge with high pressure drawn from a shallow source like a cistern, best suited as fire pump or transfer pump. The pump motor is installed on the surface for easy maintenance coupled with a shaft to turn the impellers, which is submerged below.
- A. centrifugal pump
- B. submersible pump
- C. jet pump
- D. turbine pump
Correct Answer

A. A. centrifugal pump

Explanation

A centrifugal pump is a type of pump that uses centrifugal force to generate pressure and move fluid. It is commonly used in applications where high water discharge and high pressure are required, such as firefighting or transferring water. In this scenario, the pump motor is installed on the surface for easy maintenance, while the impellers are submerged below the water source. This description matches the characteristics of a centrifugal pump.

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29.

1. A type of water pump with its pump motor installed on the surface attached to a lift and push rod to activate a submerged piston.
- A. reciprocation pump
- B. sump pump
- C. jack pump
- D. centrifugal pump
Correct Answer

A. A. reciprocation pump

Explanation

A reciprocation pump is a type of water pump that has its pump motor installed on the surface and is attached to a lift and push rod to activate a submerged piston. This type of pump uses a back-and-forth motion to draw water into the cylinder and then push it out. It is commonly used in applications where a high pressure is required, such as in oil wells or high-rise buildings.

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30.

1. Branch vents are required to have at least a slope 1/4” /feet. The purpose of which is:
- A. for convenience in installing the pipe
- B. to facilitate air movement with lesser air resistance
- C. for purposes of economy
- D. to allow any waste to drain into the drain pipe
Correct Answer

A. D. to allow any waste to drain into the drain pipe

Explanation

Branch vents are required to have at least a slope of 1/4" per foot in order to allow any waste to drain into the drain pipe. This slope ensures that gravity can effectively pull the waste down the branch vent and into the main drain pipe, preventing any blockages or backups. Without this slope, waste may not flow properly and could accumulate in the branch vent, causing plumbing issues.

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31.

1. In a water distribution system, locations such as supply pipe to every water heater requires a full open valve. Which of the following in the list is a full open valve?
- A. check valve
- B. ball valves
- C. globe valve
- D. angle valve
Correct Answer

A. D. angle valve

Explanation

An angle valve is a type of valve that allows for full flow of water when fully open. It is commonly used in water distribution systems, including in supply pipes to water heaters. The other options listed (check valve, ball valve, and globe valve) do not necessarily provide full flow when fully open, making them not suitable for this specific requirement. Therefore, the correct answer is D. angle valve.

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32.

1. In a water system with constant water supply supplying series of plumbing fixtures, water supply drop is experience when the fixtures in the series are simultaneously opened. Which poor design in the plumbing system causes this?
- A. Choice in the system of water distribution
- B. Insufficiency in the size of the water service and distribution pipe
- C. Too many fixtures opened simultaneously
- D. Use of PVC or other plastic pipes
Correct Answer

A. B. Insufficiency in the size of the water service and distribution pipe

Explanation

The correct answer is B. Insufficiency in the size of the water service and distribution pipe. This means that the pipes used in the plumbing system are not large enough to handle the simultaneous flow of water from multiple fixtures. As a result, the water supply drops because the pipes are not able to deliver enough water to meet the demand. This is a poor design in the plumbing system as it leads to inadequate water pressure and flow.

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33.

1. It is customary that a full open type of valve is used in several locations in a water distribution system. Which location in the following list DOES NOT require one?
- A. On every hose bibb
- B. On water supplies to pressurized tank
- C. On the water service pipe near the source connection
- D. On the main water distribution pipe near the water service
Correct Answer

A. A. On every hose bibb

Explanation

A full open type of valve is not required on every hose bibb because hose bibbs already have their own shut-off valves. These valves allow the user to control the flow of water from the hose bibb without the need for an additional valve. Therefore, it is not necessary to have a full open type of valve on every hose bibb in a water distribution system.

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34.

1. Minimum water delivery in liters per minute for an outlet of a wet standpipe at a residual pressure or 1.8 kilos per sq. mts.
- A. 132 liters per minute
- B. 112 liters per minute
- C. 155 liters per minute
- D. 126 liters per minute
Correct Answer

A. A. 132 liters per minute

Explanation

The correct answer is A. 132 liters per minute. This means that the minimum water delivery for the outlet of a wet standpipe at a residual pressure of 1.8 kilos per sq. mts. is 132 liters per minute.

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35.

1. The general term for the hot or cold water pipes containing potable water
- A. water plumbing pipes
- B. water distribution pipes
- C. hot or cold water line
- D. water supply pipes
Correct Answer

A. C. hot or cold water line

Explanation

The correct answer is C. hot or cold water line. This term refers to the pipes that carry potable water, whether it is hot or cold, throughout a plumbing system. It is a general term that encompasses both the hot and cold water pipes in a building.

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36.

1. The location of a fire hose cabinet connected to a standpipe for buildings shall be at every floor level above the first floor at:
- A. storeroom
- B. inside a mechanical/electrical room
- C. a landing of an enclosed stairway
- D. at any private room or rentable space
Correct Answer

A. C. a landing of an enclosed stairway

Explanation

The correct answer is C. a landing of an enclosed stairway. This is because a fire hose cabinet connected to a standpipe should be easily accessible in case of a fire emergency. Placing it at a landing of an enclosed stairway ensures that it is centrally located and easily visible to occupants on each floor. This location also allows for quick and convenient access to the fire hose in case it is needed to extinguish a fire.

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37.

1. The maximum height of a fire service connection from the grade line is ______ cms.
- A. 120 cms.
- B. 130 cms.
- C. 122 cms
- D. 102 cms.
Correct Answer

A. C. 122 cms

Explanation

The maximum height of a fire service connection from the grade line is 122 cms.

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38.

1. The maximum horizontal developed length between the trap seal and the vertical vent inlet at the trap arm.
- A. 6 feet
- B. 5 feet
- C. 4 feet
- D. 3 feet
Correct Answer

A. B. 5 feet

Explanation

The maximum horizontal developed length between the trap seal and the vertical vent inlet at the trap arm is 5 feet. This means that the distance between the trap seal and the vent inlet should not exceed 5 feet horizontally. This is important for maintaining proper venting and preventing the trap seal from being siphoned or losing its seal due to negative pressure. If the distance exceeds 5 feet, it may lead to issues with drainage and ventilation in the plumbing system.

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39.

1. The minimum height of fire service connection from the grade line is ____ cms.
- A. 50 cms.
- B. 100 cms.
- C. 46 cms.
- D. 35 cms.
Correct Answer

A. C. 46 cms.

Explanation

The minimum height of a fire service connection from the grade line is 46 cms. This means that the connection must be placed at least 46 cms above the ground level. This height requirement is important to ensure that the connection is easily accessible for firefighters in case of emergencies. It allows them to quickly connect their hoses to the fire service connection without any hindrance. A height of 46 cms strikes a balance between accessibility and protection, making it the correct answer.

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40.

1. The term used to the main water pipe delivering potable water to a building is called
- A. Water service pipe
- B. NAWASA
- C. Main pipe
- D. Water utility pipe
Correct Answer

A. A. Water service pipe

Explanation

The term used to refer to the main water pipe delivering potable water to a building is called the water service pipe. This pipe is responsible for supplying clean and drinkable water to the entire building. It is an essential component of the water distribution system and ensures that water reaches every faucet and fixture within the building.

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41.

1. Water as delivered by NAWASA is no longer safe for drinking because of several contaminants from the water source present in the environment. It is now therefore imperative that water to be safe for drinking has to undergo water purification in several stages. Because of several contaminants, water undergoes several stages. What is a stage in water purification, which removes mineral deposits, salts, heavy metal, totally dissolves solids while some useful minerals are retained?
- A. carbon filtration
- B. aeration
- C. ultraviolet radiation
- D. reverse osmosis
Correct Answer

A. D. reverse osmosis

Explanation

Reverse osmosis is a stage in water purification that removes mineral deposits, salts, heavy metals, and totally dissolves solids while retaining some useful minerals. This process uses a semi-permeable membrane to filter out impurities and contaminants, allowing only pure water molecules to pass through. Reverse osmosis is an effective method for producing clean and safe drinking water by removing a wide range of contaminants present in the water source.

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1
42.

1. What does PE pipe stands for?
- A. polyethylene pipe
- B. polythylene pipe
- C. polyvinyl extra pipes
- D. plastics extra pipe
Correct Answer

A. A. polyethylene pipe

Explanation

PE pipe stands for polyethylene pipe. Polyethylene is a type of plastic that is commonly used in the manufacturing of pipes. It is known for its durability, flexibility, and resistance to corrosion. PE pipe is widely used in various industries, including water supply, gas distribution, and irrigation systems. It is a cost-effective and reliable choice for transporting fluids and is often preferred over other types of pipes due to its long lifespan and low maintenance requirements.

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43.

1. What is a device installed on top of a pressure tank used to protect against hydrostatic collapse due to suction or negative pressure resulting from back-siphonage in a downfeed water distribution system?
- A. pressure reducing valve
- B. vacuum breaker valve
- C. air volume control valve
- D. pressure relief valve
Correct Answer

A. D. pressure relief valve

Explanation

A pressure relief valve is a device that is installed on top of a pressure tank in a downfeed water distribution system to protect against hydrostatic collapse due to suction or negative pressure resulting from back-siphonage. It is designed to relieve excess pressure in the system, preventing damage to the tank and other components.

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44.

1. What is a fire line system without a constant water supply and is equipped with a fire service inlet and outlet connection and installed exclusively for the use of the Fire Service?
- A. Fire Department House Connection
- B. Combination Standpipe
- C. Dry Standpipe
- D. Wet Standpipe
Correct Answer

A. C. Dry Standpipe

Explanation

A dry standpipe is a fire line system that does not have a constant water supply. Instead, it is equipped with a fire service inlet and outlet connection, allowing the Fire Service to connect their hoses and supply water when needed. This type of standpipe is installed exclusively for the use of the Fire Service, providing them with a readily available water source in buildings or structures where a constant water supply is not feasible or available.

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45.

1. What is a GI fitting to join two threaded fittings as close as possible but not exceeding 3 inches?
- A. Nipple
- B. None of the three
- C. Union
- D. Coupling
Correct Answer

A. A. Nipple

Explanation

A nipple is a type of GI (galvanized iron) fitting that is used to join two threaded fittings together. It is designed to be as close as possible to the two fittings it is connecting, but it should not exceed 3 inches in length. This allows for a secure and tight connection between the fittings while also ensuring that the overall length of the joint does not exceed the specified limit. Therefore, the correct answer is A. Nipple.

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46.

1. What is the minimum size of a trap or branch for a lavatory?
- A. 1 1/4”
- B. 1 3/4”
- C. 1 1/2”
- D. 2”
Correct Answer

A. A. 1 1/4”

Explanation

The minimum size of a trap or branch for a lavatory is 1 1/4”.

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47.

1. What is the minimum size of a trap or branch of a residential kitchen?
- A. 1 1/2”
- B. 1 3/4”
- C. 1 1/4”
- D. 2”
Correct Answer

A. A. 1 1/2”

Explanation

The minimum size of a trap or branch of a residential kitchen is 1 1/2 inches. This size is necessary to ensure proper drainage and prevent clogs in the plumbing system. A smaller size trap or branch would not be able to effectively handle the amount of waste and water that is generated in a kitchen. A larger size trap or branch would be unnecessary and may lead to excessive water usage. Therefore, the correct answer is A. 1 1/2 inches.

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48.

1. What is the size of supply valve for tank type water closet?
- A. 3/4”
- B. 1/2”
- C. 3/8”
- D. 1”
Correct Answer

A. C. 3/8”

Explanation

The correct answer is C. 3/8". The size of the supply valve for a tank type water closet is typically 3/8". This size is commonly used for residential water closets and provides an adequate flow rate for filling the tank efficiently. Using a larger size valve, such as 1", would not be necessary and could result in excessive water flow and waste. Similarly, using a smaller size valve, such as 1/2" or 3/4", may not provide enough water flow to properly fill the tank. Therefore, 3/8" is the appropriate size for the supply valve in this case.

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49.

1. Where are dampers installed to regulate the amount of cool air for an even distribution to outlets?
- A. at the trunk ducts
- B. at a practical location at angles and elbows
- C. at the branch supply duct as far as practical from the outlet
- D. at the air boot fitting
Correct Answer

A. C. at the branch supply duct as far as practical from the outlet

Explanation

Dampers are installed at the branch supply duct as far as practical from the outlet in order to regulate the amount of cool air for an even distribution to outlets. This location allows for better control of the airflow and ensures that the cool air is evenly distributed throughout the space. Installing dampers at the trunk ducts, at angles and elbows, or at the air boot fitting would not provide the same level of control and even distribution of cool air.

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2

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Quiz About Plumbing 1

A kind of G.I. fitting that has one end external threads, while the other end has internal threads.

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A kind of G.I. fitting used as a reducer from a bigger diameter to a lesser diameter.

A stop valve in a service pipe close to its connection with a water main.

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