3e451 Volume 3 Plumbing Systems

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| By Pggomoljak328

Pggomoljak328

Community Contributor

Quizzes Created: 6 | Total Attempts: 2,126

Questions: 124 | Attempts: 667 | Updated: Mar 21, 2023

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Questions and Answers

1.

(401) What wall thicknesses are available in copper tubing for drinking water?
- A.
  
  A, B, C, D
- B.
  
  N, O, P, DWV
- C.
  
  K, L, M, DWV
- D.
  
  Schedule 40 and 80
Correct Answer
C. K, L, M, DWV

Explanation
The wall thicknesses available in copper tubing for drinking water are K, L, M, and DWV.

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2.

(401) Galvanization provides a pipe with what benefit?
- A.
  
  Makes the pipe easier to bend
- B.
  
  Increases pipe thickness
- C.
  
  Increases pipe strength
- D.
  
  Reduces corrosion
Correct Answer
D. Reduces corrosion

Explanation
Galvanization is a process in which a protective zinc coating is applied to the surface of a metal, in this case, a pipe. This coating acts as a barrier between the pipe and the surrounding environment, preventing corrosion. Therefore, the correct answer is that galvanization reduces corrosion.

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3.

(402) What fitting joins pipes so they can be taken apart later?
- A.
  
  Union
- B.
  
  Nipple
- C.
  
  Adapter
- D.
  
  Coupling
Correct Answer
A. Union

Explanation
A union fitting is used to join pipes in a way that allows them to be easily taken apart later. It consists of two threaded ends that can be screwed onto separate pipes, and a central nut that can be tightened to create a secure connection. When the pipes need to be separated, the nut can be loosened, allowing the pipes to be easily disconnected.

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4.

(402) How do street elbows and standard elbows differ?
- A.
  
  Standard elbows have male threads
- B.
  
  Street elbows have recessed threads
- C.
  
  Standard elbows have tapered threads
- D.
  
  Street elbows have one female and one male end
Correct Answer
D. Street elbows have one female and one male end

Explanation
Street elbows and standard elbows differ in terms of their connection ends. Street elbows have one female and one male end, which means one end has a threaded opening to connect to a pipe, while the other end has a threaded protrusion to connect to another fitting or pipe. On the other hand, standard elbows typically have male threads on both ends, allowing them to be connected directly to pipes or fittings with female threads. This key difference in connection ends makes street elbows and standard elbows distinct from each other.

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5.

(402) hows do copper pressure fittings differ from copper drain, waste, and vent (DWV) fittings?
- A.
  
  DWV fittings are threaded
- B.
  
  Pressure fittings are threaded
- C.
  
  DWV fittings have a short radius sweep
- D.
  
  Pressure fittings have a deeper solder pocket
Correct Answer
D. Pressure fittings have a deeper solder pocket

Explanation
Pressure fittings have a deeper solder pocket compared to copper drain, waste, and vent (DWV) fittings. This means that pressure fittings have a larger space for soldering the joint, allowing for a stronger and more secure connection. On the other hand, DWV fittings have a shorter radius sweep, which helps to maintain the flow of waste and water in drainage systems. However, the main difference between the two is the depth of the solder pocket.

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6.

(403) What is the smallest increment on most of the tape measures in our trade?
- A.
  
  Sixty-fourth inch
- B.
  
  Thirty-second inch
- C.
  
  Sixteenth inch
- D.
  
  Eighth inch
Correct Answer
C. Sixteenth inch

Explanation
The correct answer is "Sixteenth inch." Tape measures in the trade typically have markings in fractions of an inch, with the smallest increment being a sixteenth of an inch. This means that each inch on the tape measure is divided into 16 equal parts, allowing for precise measurements in small increments.

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7.

(403) What is the next largest sixteenth-inch mark after 3/4?
- A.
  
  15/16ths
- B.
  
  13/16ths
- C.
  
  10/16ths
- D.
  
  9/16ths
Correct Answer
B. 13/16ths

Explanation
The next largest sixteenth-inch mark after 3/4 is 13/16ths. This can be determined by understanding that each inch is divided into 16 equal parts in a sixteenth-inch measurement. Starting from 0/16ths, 1/16th, 2/16ths (which simplifies to 1/8th), 3/16ths, and so on, we can see that the next largest sixteenth-inch mark after 3/4 (which is equivalent to 12/16ths) is 13/16ths.

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8.

(404) Convert 7 feet to inches.
- A.
  
  60 inches
- B.
  
  72 inches
- C.
  
  84 inches
- D.
  
  96 inches
Correct Answer
C. 84 inches

Explanation
To convert feet to inches, you need to multiply the number of feet by 12 since there are 12 inches in 1 foot. In this case, multiplying 7 feet by 12 gives us 84 inches.

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9.

(405) What kind of tape measurer can you use to determine the travel when the offset angle is known to be 45 degrees?
- A.
  
  Angle rule
- B.
  
  Travel rule
- C.
  
  Standard rule
- D.
  
  Plumber's rule
Correct Answer
D. Plumber's rule

Explanation
A plumber's rule is a type of tape measurer that is specifically designed for measuring distances and angles in plumbing applications. It is commonly used to determine the travel distance when the offset angle is known to be 45 degrees. This type of rule typically has markings and features that allow for accurate measurements and calculations in plumbing tasks.

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10.

(406) How do you determine the center of a fitting?
- A.
  
  By reading the branch, then the run
- B.
  
  By determining the angle of the branch
- C.
  
  By dividing the length of the fitting by 2
- D.
  
  By finding where lines drawn through the fitting intersect
Correct Answer
D. By finding where lines drawn through the fitting intersect

Explanation
To determine the center of a fitting, you need to find where lines drawn through the fitting intersect. This means that you would draw lines through the fitting in different directions and find the point where these lines meet. This intersection point represents the center of the fitting. By locating this point, you can accurately position and align the fitting as needed.

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11.

(406) An end-to-center measurement is made from the?
- A.
  
  Middle of the pipe to end of fitting
- B.
  
  End of pipe to center of fitting
- C.
  
  Center of pipe to end of fitting
- D.
  
  End of face to center of back
Correct Answer
B. End of pipe to center of fitting

Explanation
An end-to-center measurement is made from the end of the pipe to the center of the fitting. This means that the measurement starts at the end of the pipe and extends to the center of the fitting, which is the point where the pipe and fitting are aligned. This type of measurement is commonly used in construction and plumbing to ensure proper alignment and fitting of pipes.

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12.

(407) When cutting tubing with a tubing cutter, how far do you turn the handle after each revolution?
- A.
  
  1/8 turn
- B.
  
  1/4 turn
- C.
  
  1/2 turn
- D.
  
  1 full turn
Correct Answer
B. 1/4 turn

Explanation
When cutting tubing with a tubing cutter, it is recommended to turn the handle 1/4 turn after each revolution. This allows for a gradual and controlled cutting process, ensuring that the tubing is cut smoothly and accurately. Turning the handle 1/4 turn helps to maintain a consistent cutting speed and prevents any potential damage or uneven cuts to the tubing.

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13.

(407) To remove the burr from inside a piece of pipe, operate the handle of the reamer with?
- A.
  
  Short, even, counterclockwise strokes
- B.
  
  Long, even, counterclockwise strokes
- C.
  
  Long, even, clockwise strokes
- D.
  
  Short, even, clockwise strokes
Correct Answer
D. Short, even, clockwise strokes

Explanation
To remove the burr from inside a piece of pipe, it is best to use short, even, clockwise strokes. This motion helps to gradually remove the burr without causing any further damage to the pipe. Short strokes allow for better control and precision, while the clockwise direction helps to ensure that the burr is being shaved off effectively. Using long strokes may result in uneven removal of the burr and could potentially lead to further damage.

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14.

(408) What diameter steel pipe sizes are you able to thread with a nonadjustable ratchet style hand threader
- A.
  
  1/8 - 2 inches
- B.
  
  1/8 - 4 inches
- C.
  
  1/2 - 2 1/2 inches
- D.
  
  1/2 - 3 inches
Correct Answer
A. 1/8 - 2 inches

Explanation
A nonadjustable ratchet style hand threader is capable of threading steel pipe sizes ranging from 1/8 to 2 inches in diameter.

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15.

(408) When threading steel pipe with a hand threader, how often do you apply oil to the pipe dies?
- A.
  
  When the dies squeak
- B.
  
  Before and after cutting threads
- C.
  
  Every two or three downward stokes of the die handle
- D.
  
  Once, at the halfway point of the threading operation
Correct Answer
C. Every two or three downward stokes of the die handle

Explanation
When threading steel pipe with a hand threader, it is important to apply oil to the pipe dies every two or three downward stokes of the die handle. This is necessary to lubricate the dies and prevent them from getting stuck or damaged during the threading process. Applying oil at regular intervals ensures smooth and efficient threading of the steel pipe.

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16.

(408) What is the purpose of oiling while threading the steel pipe?
- A.
  
  Allows the pipe dies to turn freely inside the die holder
- B.
  
  Prevents the dies and threads from overheating and becoming damaged
- C.
  
  The oil penetrates the pipe walls, slows down the corrosion process, and allows increased pipe life
- D.
  
  The oil maintains a thin protective coating on the pipe and prevents flying debris from injuring the user
Correct Answer
B. Prevents the dies and threads from overheating and becoming damaged

Explanation
Oiling while threading the steel pipe prevents the dies and threads from overheating and becoming damaged. This is because the oil acts as a lubricant, reducing friction and heat generated during the threading process. Without oiling, the high heat and friction can cause the dies and threads to overheat, leading to damage and potentially rendering the pipe unusable. Therefore, oiling is necessary to ensure the proper functioning and longevity of the threading process.

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17.

(409) When threading a fitting on a pipe, what happens if you overtighten a fitting?
- A.
  
  Leaks will be stopped completely
- B.
  
  The wrench you are using might break
- C.
  
  Overall pipe length decreases by 1 inch
- D.
  
  The fitting stretches and the joint leaks
Correct Answer
D. The fitting stretches and the joint leaks

Explanation
When a fitting is overtightened on a pipe, it causes the fitting to stretch. This stretching can result in the joint becoming loose and causing leaks. Therefore, overtightening a fitting can lead to the fitting stretching and the joint leaking.

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18.

(409) What size pipe wrench do you use on a 1/4 inch pipe?
- A.
  
  4 inch
- B.
  
  8 inch
- C.
  
  10 inch
- D.
  
  12 inch
Correct Answer
B. 8 inch

Explanation
The correct answer is 8 inch because the size of the pipe wrench should be approximately four times the diameter of the pipe. Since the pipe is 1/4 inch in diameter, an 8 inch pipe wrench would be suitable for this size of pipe.

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19.

(410) What preparation must you make to produce a good bond between the base metal and the solder in a copper soldered joint?
- A.
  
  The solder must be lead free
- B.
  
  The pipe must be reamed and cut
- C.
  
  The solder must be 95/5 solder
- D.
  
  The metal surfaces must be perfectly clean at the joint
Correct Answer
D. The metal surfaces must be perfectly clean at the joint

Explanation
To produce a good bond between the base metal and the solder in a copper soldered joint, it is essential that the metal surfaces are perfectly clean at the joint. This is because any dirt, oxidation, or other contaminants on the metal surfaces can prevent the solder from properly adhering to the base metal. By ensuring that the surfaces are clean, the solder can effectively flow and bond with the base metal, creating a strong and reliable joint.

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20.

(410) How much solder is needed to solder a 1/2 inch connection
- A.
  
  1/2 inch
- B.
  
  3/4 inch
- C.
  
  7/8 inch
- D.
  
  1 inch
Correct Answer
A. 1/2 inch

Explanation
The correct answer is 1/2 inch because to solder a 1/2 inch connection, you would need a length of solder that matches the size of the connection. In this case, the connection is 1/2 inch, so you would need 1/2 inch of solder to properly solder it.

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21.

(411) When using a lever type tubing bender, you can make angles up to how many degrees?
- A.
  
  45 degrees
- B.
  
  90 degrees
- C.
  
  120 degrees
- D.
  
  180 degrees
Correct Answer
D. 180 degrees

Explanation
When using a lever type tubing bender, you can make angles up to 180 degrees. This means that the tubing can be bent completely back on itself, forming a U-shape. The lever type tubing bender allows for a wide range of angles to be achieved, making it a versatile tool for bending tubing in various applications.

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22.

(411) What action creates an watertight and airtight seal on a ferruled joint?
- A.
  
  Tighten the nut which crimps the ferrule into the tubing and against the fitting
- B.
  
  The capillary action between the components
- C.
  
  Squeezing the ferrule into the nut
- D.
  
  The compression of the tapered threads
Correct Answer
A. Tighten the nut which crimps the ferrule into the tubing and against the fitting

Explanation
Tightening the nut crimps the ferrule into the tubing and against the fitting, creating a watertight and airtight seal. This action ensures that there are no gaps or leaks in the joint, preventing the escape of water or air. The pressure applied by tightening the nut helps to secure the ferrule tightly around the tubing, ensuring a secure and sealed connection.

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23.

(412) What is one disadvantage of the no-hub drainage system?
- A.
  
  No-hubs have a tendency to leak
- B.
  
  More tools are required to make this type of joint
- C.
  
  Support around the pipe may be required
- D.
  
  The pipe ends must be reinforced to ensure they do not crush under pressure
Correct Answer
C. Support around the pipe may be required

Explanation
Support around the pipe may be required in a no-hub drainage system. This means that additional structural support, such as brackets or hangers, may need to be installed to prevent the pipe from sagging or shifting. Without proper support, the pipe may become misaligned or damaged, leading to leaks or other issues.

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24.

(412) When solvent welding plastic pipe, how do you insert the pipe into the fitting?
- A.
  
  Put the pipe halfway into the fitting to allow for expansion and contraction
- B.
  
  Quickly insert the pipe into the fitting with a one-quarter turning motion
- C.
  
  Insert the pipe into the fitting and give the pipe a full turn
- D.
  
  Thread the pipe into the fitting until no threads show
Correct Answer
B. Quickly insert the pipe into the fitting with a one-quarter turning motion

Explanation
When solvent welding plastic pipe, it is recommended to quickly insert the pipe into the fitting with a one-quarter turning motion. This is because the solvent used in the welding process has a fast-drying time, and by quickly inserting the pipe with a turning motion, it ensures that the solvent is evenly distributed and creates a strong bond between the pipe and fitting. This method also helps to prevent any excess solvent from dripping out and causing a messy joint.

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25.

(412) How is large underground plastic pipe joined?
- A.
  
  Solvent welding
- B.
  
  O-ring joints
- C.
  
  Tig welding
- D.
  
  Threading
Correct Answer
B. O-ring joints

Explanation
O-ring joints are used to join large underground plastic pipes. O-ring joints provide a tight and secure connection by using a rubber O-ring that is placed between the two pipes. The O-ring creates a seal, preventing any leakage or seepage of fluids. This method of joining is commonly used in plumbing and industrial applications where a reliable and watertight connection is required. The O-ring joints are easy to install and can be disassembled if needed, making them a practical choice for joining large underground plastic pipes.

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26.

(413) What are two types of pumps used in booster stations?
- A.
  
  Deep well and split case
- B.
  
  Booster and clear well
- C.
  
  Split case and booster
- D.
  
  Recirculating and clear well
Correct Answer
A. Deep well and split case

Explanation
The correct answer is deep well and split case. Deep well pumps are used to lift water from deep underground sources, such as wells or boreholes. Split case pumps are used for high flow and high-pressure applications, typically in water supply systems. Both types of pumps are commonly used in booster stations to increase the pressure and flow of water in the distribution system.

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27.

(413) What is the reason we use elevated storage tanks in water systems?
- A.
  
  Because of emergency water requirements
- B.
  
  Elevated storage tanks provide cheap pressure
- C.
  
  Ground tanks are for firefighting purposes only
- D.
  
  Elevated tanks last longer than ground storage tanks
Correct Answer
B. Elevated storage tanks provide cheap pressure

Explanation
Elevated storage tanks provide cheap pressure in water systems because they utilize the force of gravity to deliver water to lower areas. By placing the tanks at a higher elevation, the water can flow down naturally without the need for additional pumps or energy. This helps to reduce the cost of maintaining and operating the water system, making it a more affordable option. Additionally, elevated storage tanks can also provide a consistent and reliable water supply during emergencies or power outages, ensuring that there is always water available for essential needs.

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28.

(414) What element of a water meter translates the action of the water flow?
- A.
  
  Primary
- B.
  
  Secondary
- C.
  
  Tertiary
- D.
  
  Head area
Correct Answer
B. Secondary

Explanation
The secondary element of a water meter translates the action of the water flow. This means that it is responsible for measuring and recording the amount of water that passes through the meter. The primary element may refer to the main component or mechanism of the water meter, while the tertiary element and head area are not typically associated with the translation of water flow in this context.

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29.

(415) What is the minimum burial depth for water mains under roads?
- A.
  
  2 feet
- B.
  
  3 feet
- C.
  
  4 feet
- D.
  
  5 feet
Correct Answer
B. 3 feet

Explanation
The minimum burial depth for water mains under roads is 3 feet. This depth is necessary to protect the water mains from damage caused by traffic, construction activities, and freezing temperatures. By burying the water mains at this depth, they are less likely to be affected by external factors, ensuring their durability and functionality.

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30.

(415) What is the part of the water distribution system that originates at the street main and extends into the building?
- A.
  
  Water mains
- B.
  
  Distribution mains
- C.
  
  Water service lines
- D.
  
  Lateral water mains
Correct Answer
C. Water service lines

Explanation
Water service lines are the part of the water distribution system that originates at the street main and extends into the building. These lines connect the building to the water main and are responsible for delivering water from the main to the individual building. They are typically smaller in diameter compared to the distribution mains and are responsible for supplying water to individual properties.

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31.

(415) Before a new water main is put into service it must be?
- A.
  
  Cured and tested
- B.
  
  Tested and leveled
- C.
  
  Leveled and disinfected
- D.
  
  Tested and disinfected
Correct Answer
D. Tested and disinfected

Explanation
Before a new water main is put into service, it must be tested to ensure that it meets the required standards and is free from any defects or leaks. This is important to ensure the safety and quality of the water supply. Additionally, the water main must be disinfected to eliminate any potential bacteria or contaminants that may be present. This is done to protect public health and ensure that the water is safe for consumption. Therefore, the correct answer is "Tested and disinfected."

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32.

(416) What Air Force form is used to maintain a record of each hydrant and its isolation valve?
- A.
  
  AF Form 996
- B.
  
  AF Form 997
- C.
  
  AF Form 998
- D.
  
  AF Form 1027
Correct Answer
D. AF Form 1027

Explanation
AF Form 1027 is the correct answer because it is used to maintain a record of each hydrant and its isolation valve in the Air Force. This form is likely designed specifically for this purpose and includes all the necessary fields and information required to track and document the maintenance of hydrants and isolation valves. The other forms listed (AF Form 996, AF Form 997, and AF Form 998) are not specified to be used for this purpose, so they are not the correct answer.

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33.

(416) If the water level in a fire hydrant barrel rises after the hydrant is shut off, then?
- A.
  
  The weep hole is plugged
- B.
  
  The main valve is leaking
- C.
  
  There is a loose packing gland
- D.
  
  There is too much residual pressure
Correct Answer
B. The main valve is leaking

Explanation
If the water level in a fire hydrant barrel rises after the hydrant is shut off, it indicates that the main valve is leaking. This means that the valve is not closing properly and allowing water to continue flowing even when it should be shut off. The rising water level in the barrel is a clear indication of this leakage.

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34.

(417) What is the normal operating pressure of a water distribution system?
- A.
  
  5 to 10 pounds per square inch
- B.
  
  10 to 20 pounds per square inch
- C.
  
  40 to 75 pounds per square inch
- D.
  
  100 to 200 pounds per square inch
Correct Answer
C. 40 to 75 pounds per square inch

Explanation
The normal operating pressure of a water distribution system is typically between 40 to 75 pounds per square inch. This range of pressure ensures that water can flow effectively through the system and reach all intended destinations. Pressure below this range may result in insufficient water flow, while pressure above this range can cause damage to pipes and fixtures.

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35.

(417) Which instrument is used to measure velocity flow from a fire hydrant?
- A.
  
  Pitot tube
- B.
  
  Vacuum gauge
- C.
  
  Pressure gauge
- D.
  
  Hydrant gauge assembly
Correct Answer
A. Pitot tube

Explanation
A Pitot tube is used to measure the velocity flow from a fire hydrant. It is a device that has a tube with an opening facing the flow of water. The water enters the tube, creating a pressure difference between the static pressure and the dynamic pressure. By measuring this pressure difference, the velocity of the water flow can be determined. This makes the Pitot tube an ideal instrument for measuring the velocity flow from a fire hydrant.

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36.

(417) After you have taken all the hydrant readings, you should shut down the hydrants slowly to?
- A.
  
  Decrease flushing time
- B.
  
  Prevent surges in pressure
- C.
  
  Increase flushing time
- D.
  
  Increase the pressure throughout the system
Correct Answer
B. Prevent surges in pressure

Explanation
Shutting down the hydrants slowly after taking all the readings helps prevent surges in pressure. Abruptly closing the hydrants can cause a sudden change in pressure, leading to surges that can damage the system or cause water hammer. By closing the hydrants slowly, the pressure is gradually equalized, preventing any sudden changes and maintaining the stability of the system.

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37.

(418) One of the factors to consider when sizing the supply for a building is the type of?
- A.
  
  Fixture style
- B.
  
  Flush devices
- C.
  
  Service mains
- D.
  
  Supply piping
Correct Answer
B. Flush devices

Explanation
When sizing the supply for a building, one of the factors to consider is the type of flush devices. This refers to the fixtures in the building that require water for flushing, such as toilets, urinals, and bidets. Different flush devices have varying water consumption rates, so it is important to take this into account when determining the size of the water supply. By considering the flush devices, the appropriate amount of water can be provided to ensure efficient and effective operation of the fixtures.

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38.

(418) To solder copper joints in a water distribution piping, you must not use solder containing?
- A.
  
  Less than 0.2 percent lead
- B.
  
  More than 0.2 percent lead
- C.
  
  Less than 0.2 percent antimony
- D.
  
  More than 0.2 percent antimony
Correct Answer
B. More than 0.2 percent lead

Explanation
When soldering copper joints in water distribution piping, it is important not to use solder containing more than 0.2 percent lead. This is because lead can leach into the water and contaminate it, posing a health risk to those who consume the water. Therefore, solder with a lead content higher than 0.2 percent should be avoided to ensure the safety and quality of the water supply.

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39.

(418) How are building water distribution branch lines normally installed?
- A.
  
  Horizontally, with a slight grade toward the shutoff valve
- B.
  
  Horizontally, with a slight grade toward the point of use
- C.
  
  Vertically, with a slight grade toward the shutoff valve
- D.
  
  Vertically, with a slight grade toward the point of use
Correct Answer
A. Horizontally, with a slight grade toward the shutoff valve

Explanation
Building water distribution branch lines are normally installed horizontally with a slight grade toward the shutoff valve. This allows for proper drainage and prevents the buildup of stagnant water in the pipes. Installing the branch lines with a slight grade toward the shutoff valve also ensures that water can be easily shut off in case of emergencies or repairs.

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40.

(418) What device do you install in a building distribution system to correct a water hammer problem?
- A.
  
  Vertical air chamber
- B.
  
  Horizontal air chamber
- C.
  
  Vertical expansion fitting
- D.
  
  Horizontal expansion fitting
Correct Answer
A. Vertical air chamber

Explanation
A water hammer problem occurs when there is a sudden change in water flow, causing a pressure surge that can damage pipes and fixtures. To correct this issue, a vertical air chamber is installed in the building distribution system. This device acts as a cushion, absorbing the pressure surge and preventing the water hammer effect. By allowing air to compress and expand within the chamber, it helps to stabilize the water flow and protect the system from potential damage. Horizontal air chambers, vertical expansion fittings, and horizontal expansion fittings are not specifically designed to address water hammer problems.

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41.

(419) The first step in the rough-in of fixtures is to locate the?
- A.
  
  Main stack opening
- B.
  
  Vertical trap position
- C.
  
  Sewer and water line locations
- D.
  
  Exact position of the opening for each fixture
Correct Answer
D. Exact position of the opening for each fixture

Explanation
The correct answer is "Exact position of the opening for each fixture". In the rough-in of fixtures, it is important to determine the exact position of the opening for each fixture. This involves locating where each fixture, such as a sink or toilet, will be installed and marking the position of the opening accordingly. This step is crucial in ensuring that the fixtures are properly aligned and connected to the plumbing system.

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42.

(419) Where on the studs should you cut holes for water supply lines?
- A.
  
  Top
- B.
  
  Bottom
- C.
  
  Center
- D.
  
  Corner
Correct Answer
C. Center

Explanation
When installing water supply lines on studs, it is recommended to cut holes in the center of the studs. This ensures that the holes are evenly spaced and provides stability to the water supply lines. Cutting holes in the center also helps to prevent any potential damage to the water supply lines caused by contact with the edges of the studs.

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43.

(419) To reinforce a structural beam that has been undercut?
- A.
  
  Wedge a block in the notch and nail it in place
- B.
  
  Toenail four nails at angles to hold the pipe securely in place
- C.
  
  Cover the opening with a half-inch wooden strip and nail it in place
- D.
  
  Place a strap iron brace across the notch and fasten it with lag screws
Correct Answer
D. Place a strap iron brace across the notch and fasten it with lag screws

Explanation
To reinforce a structural beam that has been undercut, placing a strap iron brace across the notch and fastening it with lag screws would be the most effective solution. This method provides additional support and stability to the beam, preventing it from weakening or collapsing. The strap iron brace, along with the lag screws, helps distribute the load evenly and reinforces the structural integrity of the beam.

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44.

(420) When hanging steel pipe, place hangers no further apart than?
- A.
  
  4 feet
- B.
  
  6 feet
- C.
  
  10 feet
- D.
  
  12 feet
Correct Answer
D. 12 feet

Explanation
When hanging steel pipe, it is recommended to place hangers no further apart than 12 feet. This is because steel pipes can be heavy and placing hangers at larger intervals may cause the pipe to sag or put excessive stress on the hangers. By keeping the hangers closer together, the weight of the pipe is distributed more evenly, ensuring proper support and minimizing the risk of damage or failure.

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45.

(420) How many feet apart should 1 1/2 inch diameter horizontal copper tubing be supported?
- A.
  
  4 feet
- B.
  
  6 feet
- C.
  
  8 feet
- D.
  
  10 feet
Correct Answer
B. 6 feet

Explanation
Horizontal copper tubing should be supported every 6 feet to prevent sagging or damage. This distance ensures that the tubing is adequately supported and can maintain its structural integrity. Supporting the tubing at this interval helps to distribute the weight evenly and prevents excessive strain on any one section.

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46.

Plastic pipe and tubing must be supported evert?
- A.
  
  4 feet
- B.
  
  6 feet
- C.
  
  8 feet
- D.
  
  10 feet
Correct Answer
A. 4 feet

Explanation
Plastic pipe and tubing must be supported every 4 feet to ensure proper stability and prevent sagging or damage. Proper support is necessary to maintain the integrity of the pipe or tubing and prevent any potential leaks or breakages. By providing support at regular intervals, the weight of the pipe or tubing is evenly distributed, reducing the risk of any structural issues.

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47.

(421) the primary purpose of periodic testing of water mains for flow and pressure is to ensure that?
- A.
  
  Sufficient water is available for fire fighting
- B.
  
  The water system can meet the public demands for water
- C.
  
  Firefighters know how much water a hydrant can produce in inches of mercury
- D.
  
  Firefighters know how many pounds per square inch the system can usually provide
Correct Answer
A. Sufficient water is available for fire fighting

Explanation
The primary purpose of periodic testing of water mains for flow and pressure is to ensure that sufficient water is available for fire fighting. This testing helps to determine if the water system can deliver an adequate amount of water to extinguish fires effectively. By conducting these tests, any issues with the water supply can be identified and addressed to ensure that firefighters have access to the necessary water resources in emergency situations.

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48.

(421) Who must be notified anytime a water main is turned off?
- A.
  
  Base operations
- B.
  
  Command post
- C.
  
  Service call desk
- D.
  
  Fire department
Correct Answer
D. Fire department

Explanation
The fire department must be notified anytime a water main is turned off because they rely on a steady supply of water to effectively respond to emergencies. In the event of a fire, they need access to water for extinguishing the flames and protecting lives and property. Therefore, it is crucial to inform the fire department when a water main is shut off so they can make any necessary adjustments to their response plans and ensure they have alternative water sources available if needed.

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49.

(422) How many times are pipes in the water systems tested?
- A.
  
  Once, after the fixtures are installed
- B.
  
  Once, after rough-in is completed
- C.
  
  Twice, after rough-in and after fixtures are installed
- D.
  
  Twice, after the fixtures are installed and after the appliances are connected
Correct Answer
C. Twice, after rough-in and after fixtures are installed

Explanation
Pipes in water systems are tested twice, once after rough-in is completed and once after fixtures are installed. This ensures that the pipes are functioning properly and there are no leaks or issues in the system. Testing after rough-in allows for any necessary adjustments or repairs to be made before the fixtures are installed. Testing after fixtures are installed ensures that the entire system is working correctly and ready for use.

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50.

(422) How much air pressure should you use for testing piping for leaks?
- A.
  
  20 psi
- B.
  
  30 psi
- C.
  
  40 psi
- D.
  
  50 psi
Correct Answer
D. 50 psi

Explanation
The correct answer is 50 psi because this is the recommended air pressure for testing piping for leaks. Using a higher pressure ensures that any potential leaks will be detected, as the pressure will force air to escape through even small openings. It is important to test piping for leaks before using it to ensure that it is safe and functioning properly.

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Quiz Review Timeline +

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Current Version
Mar 21, 2023

Quiz Edited by
ProProfs Editorial Team
Feb 27, 2013

Quiz Created by
Pggomoljak328

3e451 Volume 3 Plumbing Systems

(401) What wall thicknesses are available in copper tubing for drinking water?

(401) Galvanization provides a pipe with what benefit?

(402) What fitting joins pipes so they can be taken apart later?

(402) How do street elbows and standard elbows differ?

(402) hows do copper pressure fittings differ from copper drain, waste, and vent (DWV) fittings?

(403) What is the smallest increment on most of the tape measures in our trade?

(403) What is the next largest sixteenth-inch mark after 3/4?

(404) Convert 7 feet to inches.

(405) What kind of tape measurer can you use to determine the travel when the offset angle is known to be 45 degrees?

(406) How do you determine the center of a fitting?

(406) An end-to-center measurement is made from the?

(407) When cutting tubing with a tubing cutter, how far do you turn the handle after each revolution?

(407) To remove the burr from inside a piece of pipe, operate the handle of the reamer with?

(408) What diameter steel pipe sizes are you able to thread with a nonadjustable ratchet style hand threader

(408) When threading steel pipe with a hand threader, how often do you apply oil to the pipe dies?

(408) What is the purpose of oiling while threading the steel pipe?

(409) When threading a fitting on a pipe, what happens if you overtighten a fitting?

(409) What size pipe wrench do you use on a 1/4 inch pipe?

(410) What preparation must you make to produce a good bond between the base metal and the solder in a copper soldered joint?

(410) How much solder is needed to solder a 1/2 inch connection

(411) When using a lever type tubing bender, you can make angles up to how many degrees?

(411) What action creates an watertight and airtight seal on a ferruled joint?

(412) What is one disadvantage of the no-hub drainage system?

(412) When solvent welding plastic pipe, how do you insert the pipe into the fitting?

(412) How is large underground plastic pipe joined?

(413) What are two types of pumps used in booster stations?

(413) What is the reason we use elevated storage tanks in water systems?

(414) What element of a water meter translates the action of the water flow?

(415) What is the minimum burial depth for water mains under roads?

(415) What is the part of the water distribution system that originates at the street main and extends into the building?

(415) Before a new water main is put into service it must be?

(416) What Air Force form is used to maintain a record of each hydrant and its isolation valve?

(416) If the water level in a fire hydrant barrel rises after the hydrant is shut off, then?

(417) What is the normal operating pressure of a water distribution system?

(417) Which instrument is used to measure velocity flow from a fire hydrant?

(417) After you have taken all the hydrant readings, you should shut down the hydrants slowly to?

(418) One of the factors to consider when sizing the supply for a building is the type of?

(418) To solder copper joints in a water distribution piping, you must not use solder containing?

(418) How are building water distribution branch lines normally installed?

(418) What device do you install in a building distribution system to correct a water hammer problem?

(419) The first step in the rough-in of fixtures is to locate the?

(419) Where on the studs should you cut holes for water supply lines?

(419) To reinforce a structural beam that has been undercut?

(420) When hanging steel pipe, place hangers no further apart than?

(420) How many feet apart should 1 1/2 inch diameter horizontal copper tubing be supported?

Plastic pipe and tubing must be supported evert?

(421) the primary purpose of periodic testing of water mains for flow and pressure is to ensure that?

(421) Who must be notified anytime a water main is turned off?

(422) How many times are pipes in the water systems tested?

(422) How much air pressure should you use for testing piping for leaks?