Pipe Laying, Trenching, Miscellaneous
Questions and Answers
- 1.
In general, why is no shoring required for water trenches?
- A.
They are planned for stable ground.
- B.
They are usually less than 5 ft deep.
- C.
Sloping is required instead of shoring.
- D.
Shielding is required instead of shoring.
Correct Answer
B. They are usually less than 5 ft deep.Explanation
Water trenches are usually less than 5 ft deep, which is why no shoring is required. Shoring is typically needed for trenches that are deeper than 5 ft to prevent the sides from collapsing and to ensure the safety of workers. However, since water trenches are shallower, the soil is more stable and less likely to cave in, eliminating the need for shoring.Rate this question:
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- 2.
What is the minimum cover over water pipes?
- A.
24 inches
- B.
32 inches
- C.
42 inches
- D.
36 inches
Correct Answer
D. 36 inchesExplanation
The minimum cover over water pipes is 36 inches. This means that the pipes should be buried at least 36 inches below the surface of the ground. This depth is necessary to protect the pipes from damage caused by external factors such as freezing temperatures, soil movement, and traffic loads. It also helps to prevent accidental damage during construction or excavation activities. By providing adequate cover, the pipes are better insulated and less likely to experience leaks or breaks, ensuring the efficient and reliable supply of water.Rate this question:
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- 3.
What equipment is used to trench rock and hardpan?
- A.
Excavator with carbide tipped breaker
- B.
Dozer
- C.
Dragline
- D.
Vermeer trencher with carbide tipped teeth
Correct Answer
D. Vermeer trencher with carbide tipped teethExplanation
The Vermeer trencher with carbide tipped teeth is the correct answer because it is specifically designed to trench rock and hardpan. The carbide tipped teeth on the trencher are able to penetrate and break through tough surfaces effectively. The other options, such as the excavator with carbide tipped breaker, dozer, and dragline, may be used for other excavation purposes but may not be as suitable for trenching rock and hardpan.Rate this question:
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- 4.
What does the surveyor stakes represent?
- A.
Flow line only
- B.
The undercut for bedding material
- C.
Off-set of flow line
- D.
Cut and fill
Correct Answer
A. Flow line onlyExplanation
The surveyor stakes represent the flow line only. Flow line refers to the elevation or level at which water would flow if it were present. The surveyor stakes are used to mark this specific level, allowing for accurate measurements and calculations in construction or engineering projects that involve water drainage or management. The stakes do not represent the undercut for bedding material, the off-set of flow line, or the cut and fill aspects of the project.Rate this question:
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- 5.
What must the grade setter do to prepare for cut when reviewing surveyor’s stakes?
- A.
Consult engineer or inspector to review before cutting
- B.
Calculate the flow line from the surveyor's off-set
- C.
Cut exactly where surveyor has indicated on his stakes
- D.
Add the thickness of pipe and bedding material to cut
Correct Answer
D. Add the thickness of pipe and bedding material to cutExplanation
The grade setter must add the thickness of the pipe and bedding material to the cut when reviewing the surveyor's stakes. This is necessary to ensure that the cut is made at the correct depth, taking into account the additional layers that will be added later. By adding the thickness of the pipe and bedding material, the grade setter can accurately determine the depth at which the cut should be made.Rate this question:
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- 6.
Which pipe can no longer be used in laying water pipe?
- A.
PVC
- B.
Ductile iron
- C.
Asbestos cement
- D.
Cast iron
Correct Answer
C. Asbestos cementExplanation
Asbestos cement pipes can no longer be used in laying water pipes due to health and safety concerns. Asbestos is a hazardous material that has been linked to serious health issues, including lung cancer and mesothelioma. In many countries, the use of asbestos has been banned or heavily restricted. Therefore, it is no longer considered a safe or suitable material for water pipe infrastructure.Rate this question:
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- 7.
What is on the opposite end of the bell of a pipe?
- A.
Flat end
- B.
Mouth
- C.
Spigot
- D.
Lead
Correct Answer
C. SpigotExplanation
A spigot is a small peg or plug used to control the flow of liquid from a pipe. In the context of a bell-shaped pipe, the opposite end of the bell would typically have a spigot to regulate the release of air or fluid. This allows for better control and manipulation of the sound produced by the pipe.Rate this question:
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- 8.
Pipes over ___” generally require mechanical fittings (flange, gasket, bolts
- A.
6"
- B.
8"
- C.
10"
- D.
12"
Correct Answer
A. 6"Explanation
Pipes over 6" generally require mechanical fittings such as flange, gasket, and bolts. This means that for pipes with a diameter larger than 6 inches, it is necessary to use these fittings to ensure a secure and tight connection. This is because larger pipes have a higher flow rate and pressure, requiring stronger and more reliable fittings to prevent leaks and maintain the integrity of the pipeline system.Rate this question:
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- 9.
When are mechanical couplings required?
- A.
On all pipes
- B.
Larger pipes only
- C.
Smaller pipes only
- D.
Depends on engineer's specifications
Correct Answer
B. Larger pipes onlyExplanation
Mechanical couplings are required on larger pipes only because they provide a secure and reliable connection between two pipe sections. Larger pipes have a higher flow rate and carry more pressure, which increases the risk of pipe separation or leakage. Therefore, mechanical couplings are necessary to ensure the integrity and stability of the joint, preventing any potential damage or failure. Smaller pipes may not require mechanical couplings as they have lower flow rates and carry less pressure, making them less prone to separation or leakage. The need for mechanical couplings ultimately depends on the engineer's specifications and the specific requirements of the project.Rate this question:
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- 10.
When are watertight plugs placed onto ends of pipe to protect from debris and animals?
- A.
When not in use
- B.
End of week
- C.
End of shift
- D.
None of the above
Correct Answer
C. End of shiftExplanation
Watertight plugs are placed onto ends of pipes at the end of a shift to protect them from debris and animals. This is done to ensure that the pipes remain clean and free from any potential damage or blockage. Placing the plugs at the end of the shift allows for immediate protection and prevents any unwanted materials or creatures from entering the pipes during periods of inactivity.Rate this question:
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- 11.
How can time be saved working with small pipes as opposed to large pipes?
- A.
Smaller pipes do not require as much inspection and testing.
- B.
Smaller pipes can always be moved by hand.
- C.
Smaller pipes can be transferred directly from boom truck into trench.
- D.
All of the above
Correct Answer
C. Smaller pipes can be transferred directly from boom truck into trench.Explanation
Working with small pipes can save time because they can be transferred directly from a boom truck into the trench. This eliminates the need for additional steps such as moving the pipes by hand or conducting extensive inspection and testing.Rate this question:
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- 12.
What type of tablet is needed to kill bacteria when pipe is filled with water?
- A.
Florine
- B.
Chlorine
- C.
Bleach
- D.
Ammonia
Correct Answer
B. ChlorineExplanation
Chlorine is the correct answer because it is a chemical compound that is commonly used as a disinfectant to kill bacteria and other microorganisms in water. When added to water, chlorine reacts with the bacteria and viruses, disrupting their cellular structure and rendering them unable to reproduce or cause harm. This makes chlorine an effective agent for treating water in pipes and other water systems to ensure that it is safe for consumption and use.Rate this question:
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- 13.
What is the purpose of running insulated wire along the service line?
- A.
To connect electrical utility connection.
- B.
It is not required to run wire along service line.
- C.
It is necessary to feed electrical water valve along service line.
- D.
Line can later be detected by metal detector.
Correct Answer
D. Line can later be detected by metal detector.Explanation
The purpose of running insulated wire along the service line is to make it possible to detect the line later using a metal detector. This is important for various reasons, such as locating the line for maintenance or repair purposes, or to prevent accidental damage to the line during construction or excavation work. The insulation on the wire helps to protect it from damage and ensures that it can be easily detected using a metal detector.Rate this question:
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- 14.
What size of insulated wire is required to run from service line?
- A.
14 gauge
- B.
12 gauge
- C.
10 gauge
- D.
8 gauge
Correct Answer
C. 10 gaugeExplanation
The size of insulated wire required to run from the service line is 10 gauge. The gauge of a wire refers to its thickness, with a lower gauge indicating a thicker wire. Thicker wires are typically used for longer distances or when there is a higher electrical load. In this case, a 10 gauge wire is necessary to handle the electrical load and maintain proper conductivity from the service line.Rate this question:
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- 15.
Why is wire necessary instead of just pipe for detection?
- A.
Most service pipes are made of polyethylene or type K copper.
- B.
Most service pipes are made of clay.
- C.
Most service pipes are made of cast-in-place concrete conduits.
- D.
Most service pipes are too deep to be detected without wire.
Correct Answer
A. Most service pipes are made of polyethylene or type K copper.Explanation
Wire is necessary instead of just pipe for detection because most service pipes are made of polyethylene or type K copper. These materials do not conduct electricity, which means that without a wire, it would be difficult to detect the location of these pipes using electrical methods. The wire is used to provide a conductive path that can be detected using specialized equipment, allowing for the accurate location of the service pipes.Rate this question:
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- 16.
What is installed on the main line to connect to the service line?
- A.
Waddle strap
- B.
Strap saddle
- C.
Main strap connection
- D.
Cradle gurney
Correct Answer
B. Strap saddleExplanation
A strap saddle is installed on the main line to connect to the service line. This device acts as a connector between the main line and the service line, ensuring a secure and stable connection. It is commonly used in plumbing or utility installations to join pipes or lines together. The strap saddle is designed to provide support and prevent any potential leaks or disruptions in the flow of the service line.Rate this question:
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- 17.
What component goes in between main line and property water meter?
- A.
Component stop
- B.
Stop plug
- C.
Stop connection
- D.
Corporation stop
Correct Answer
D. Corporation stopExplanation
A corporation stop is a component that is placed between the main water line and the property water meter. It is used to control the flow of water to the property and allows for easy maintenance and repairs. The other options mentioned, such as component stop, stop plug, and stop connection, do not accurately describe the specific component that is typically used in this location.Rate this question:
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- 18.
What is color code for electric?
- A.
Red
- B.
Blue
- C.
Yellow
- D.
Green
Correct Answer
A. RedExplanation
Electricity is commonly associated with the color red, especially in electrical wiring and circuits. Red is often used to indicate live or active electrical components, while other colors such as blue, yellow, and green are typically used for different purposes, such as neutral wires, grounding, or signaling. Therefore, the color code for electric is red.Rate this question:
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- 19.
What does yellow represent?
- A.
Sewer
- B.
Gas
- C.
Communication
- D.
Storm Drain
Correct Answer
B. GasExplanation
Yellow represents gas. This is because in many countries, yellow is the standardized color for gas pipes and fittings. This helps to easily identify and differentiate gas lines from other utilities like water or electricity. The use of yellow for gas is a safety measure to prevent accidents and ensure that gas-related equipment and infrastructure are easily recognizable.Rate this question:
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- 20.
What does orange represent?
- A.
Gas
- B.
Electric
- C.
Communication
- D.
Potable water
Correct Answer
C. CommunicationExplanation
Orange is commonly associated with communication because it is often used to represent warning signs or alerts. In many countries, orange is used for traffic cones, construction signs, and other indications of caution or potential danger. This color choice is intended to grab attention and convey important information quickly. Therefore, the correct answer for this question is communication.Rate this question:
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- 21.
What is color code for potable water?
- A.
Green
- B.
White
- C.
Yellow
- D.
Blue
Correct Answer
D. BlueExplanation
Blue is the color code for potable water. This color is widely recognized as the standard for indicating that water is safe for drinking. It is used in various contexts such as water pipes, plumbing fixtures, and water storage containers to differentiate potable water from other types of water. The use of blue as the color code for potable water helps to ensure that people can easily identify and access safe drinking water sources.Rate this question:
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- 22.
What does green represent?
- A.
Sewer
- B.
Water
- C.
Storm Drain
- D.
Communication
Correct Answer
A. SewerExplanation
Green typically represents the sewer system. This is because sewer pipes are often colored green to distinguish them from other utility pipes. The color coding helps to prevent accidental damage or confusion during construction or maintenance work. Additionally, green is commonly associated with nature and the environment, which aligns with the purpose of the sewer system in managing and treating wastewater to protect the environment.Rate this question:
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- 23.
What is used to join new water line with old for testing before new can be approved for use?
- A.
Nothing. New cannot be connected to old until approved independently.
- B.
Connected by pipe with a blowoff on old side and a blowoff on new side
- C.
Connected by a strap saddle.
- D.
Connected by a temporary pressure release valve.
Correct Answer
B. Connected by pipe with a blowoff on old side and a blowoff on new sideExplanation
In order to test the new water line before it can be approved for use, it needs to be connected to the old line using a pipe. This pipe should have a blowoff on both the old side and the new side. The blowoff valves allow for the release of any excess pressure or water during the testing process. This method ensures that the new water line can be independently tested and approved before being connected to the old line.Rate this question:
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- 24.
How many hours of testing is required for water line?
- A.
6 hours
- B.
12 hours
- C.
24 hours
- D.
48 hours
Correct Answer
C. 24 hoursExplanation
The correct answer is 24 hours because it is the most reasonable amount of time required for testing a water line. Testing a water line involves checking for leaks, pressure, and overall functionality, which can take a significant amount of time. 6 hours may not be enough to thoroughly test the line, while 12 hours and 48 hours seem excessive for this task. Therefore, 24 hours is the most appropriate choice.Rate this question:
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- 25.
How many pounds per square inch (PSI) is required for testing water line?
- A.
100 psi
- B.
120 psi
- C.
140 psi
- D.
150 psi
Correct Answer
D. 150 psiExplanation
The correct answer is 150 psi. This is the amount of pressure in pounds per square inch that is required for testing a water line. This level of pressure is necessary to ensure that the water line is able to withstand the normal operating conditions and any potential fluctuations in pressure. It is important to test the water line at this high pressure to identify any leaks or weaknesses in the system before it is put into use.Rate this question:
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- 26.
In what direction do you make trenching for sewer pipes?
- A.
Down-grade
- B.
North to South
- C.
Up-grade
- D.
South to North
Correct Answer
C. Up-gradeExplanation
Trenching for sewer pipes is typically done in an up-grade direction. This means that the trench is dug in an upward slope, allowing for proper drainage of the sewage. By trenching in an up-grade direction, gravity helps to move the wastewater from higher to lower points in the sewer system, ensuring efficient flow and preventing blockages.Rate this question:
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- 27.
Why do job specifications usually call for the last 2 feet of digging to be vertical and no more than 1’ wider than sewer pipe to be laid?
- A.
To ensure that trench bottom will be compacted.
- B.
To avoid excess and unnecessary excavation.
- C.
To keep the pipe from being damaged by the full bearing weight of the width of the trench
- D.
None of the above
Correct Answer
C. To keep the pipe from being damaged by the full bearing weight of the width of the trenchExplanation
The last 2 feet of digging being vertical and no more than 1' wider than the sewer pipe helps to keep the pipe from being damaged by the full bearing weight of the width of the trench. This means that the weight of the soil and any other materials above the pipe will be evenly distributed and not concentrated on the sides of the pipe. This reduces the risk of the pipe being crushed or damaged, ensuring its integrity and longevity.Rate this question:
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- 28.
If you use a laser instead of string to mark grade, how do you keep operator in line?
- A.
Paint
- B.
Flags
- C.
Ground crew
- D.
GPS
Correct Answer
A. PaintExplanation
Using paint instead of a string to mark a grade allows the operator to stay in line by visually following the painted marks. The operator can easily see where the grade needs to be marked and can ensure accuracy by aligning the paint marks accordingly. This method eliminates the need for a physical string and allows for a more efficient and precise marking process.Rate this question:
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- 29.
What type of trenching is used in stable ground?
- A.
Shielding
- B.
Shoring
- C.
Sloping
- D.
Scaling
Correct Answer
B. ShoringExplanation
Shoring is the correct answer because it is a method of trenching used in stable ground. Shoring involves the use of supporting structures such as timber or steel to prevent the collapse of the trench walls. This method is used when the ground is stable and there is a low risk of cave-ins or collapses. Shoring provides structural support to the trench walls, ensuring the safety of workers and preventing soil movement.Rate this question:
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- 30.
What type of trenching is used in loosed ground?
- A.
Shielding
- B.
Shoring
- C.
Sloping
- D.
Scaling
Correct Answer
C. SlopingExplanation
Sloping is the correct answer because it is the type of trenching used in loose ground. Sloping involves cutting the trench walls at an angle to prevent collapse and provide stability. This method is suitable for loose ground as it helps to prevent soil movement and cave-ins, ensuring the safety of workers inside the trench. Shielding is used in more stable ground conditions, while shoring involves the use of supports or walls to prevent collapse in unstable ground. Scaling, on the other hand, refers to the removal of loose rocks or debris from a slope or trench wall.Rate this question:
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- 31.
What type of trenching is used in hard ground?
- A.
Scaling
- B.
Shoring
- C.
Sloping
- D.
Shielding
Correct Answer
D. ShieldingExplanation
Shielding is the correct answer because it is the type of trenching used in hard ground. Shielding involves the use of trench boxes or other types of protective systems to prevent the collapse of the trench walls in hard and unstable soil conditions. This method provides a safe working environment for workers by providing a barrier between them and the surrounding soil. It is commonly used when the soil is too hard or unstable to be sloped or when shoring is not feasible.Rate this question:
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- 32.
What is the advantage of PVC sewer pipe over cast iron when installing?
- A.
Because they come in longer spans, there is less total connections to make.
- B.
It requires smaller machines.
- C.
It requires smaller crew.
- D.
PVC comes in smaller spans allowing easier handling by crewmen.
Correct Answer
A. Because they come in longer spans, there is less total connections to make.Explanation
The advantage of PVC sewer pipe over cast iron when installing is that PVC pipes come in longer spans, which means there are fewer total connections to make. This reduces the time and effort required for installation and decreases the chances of leaks or other issues at connection points. Additionally, fewer connections also mean fewer potential weak points in the sewer system, enhancing its overall durability and reliability.Rate this question:
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- 33.
Why is the slotted bucket attachment used on the hoe when backfilling the first 3 feet of trench?
- A.
The teeth are needed to rip the confined area.
- B.
To capture the large rocks to set aside and keep out of initial backfill around pipe.
- C.
To capture the smaller rocks for use on initial backfill.
- D.
It digs efficiently in the confined area.
Correct Answer
B. To capture the large rocks to set aside and keep out of initial backfill around pipe.Explanation
The slotted bucket attachment is used on the hoe when backfilling the first 3 feet of the trench in order to capture the large rocks and set them aside. This is important to keep these rocks out of the initial backfill around the pipe, as they could potentially cause damage or blockage. By capturing and setting aside the large rocks, the backfill can be done more effectively and without any obstruction.Rate this question:
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- 34.
What may happen if you lay pipe over base that is not fully compacted?
- A.
Nothing. Pipe's weight will be enough to compact base underneath.
- B.
Pipe may roll when laid.
- C.
Backfill can damage pipe.
- D.
It will likely cause leaks at joint in pipe.
Correct Answer
C. Backfill can damage pipe.Explanation
If the base is not fully compacted before laying the pipe, there may be gaps or unevenness in the base. When backfilling is done, the pressure from the soil can cause these gaps to collapse or shift, potentially damaging the pipe. This can lead to leaks or even complete failure of the pipe system. Therefore, it is important to ensure that the base is fully compacted before laying the pipe to prevent such damage.Rate this question:
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- 35.
If trench bottom is soft, how do you proceed?
- A.
Consult inspector and/or engineer
- B.
Undercut to stable bottom and apply additional bedding material
- C.
Charge as extra work
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
If the trench bottom is soft, it is important to consult with an inspector and/or engineer for guidance on how to proceed. They will have the expertise to assess the situation and provide recommendations on the best course of action. One possible solution is to undercut the soft bottom and apply additional bedding material to create a stable foundation for the trench. This may require extra work and additional resources, which may need to be charged separately. Therefore, all of the above options are valid approaches when dealing with a soft trench bottom.Rate this question:
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- 36.
The spigot of the pipe should face?
- A.
Upstream
- B.
North
- C.
May be upstream or downstream
- D.
Downstream
Correct Answer
D. DownstreamExplanation
The spigot of the pipe should face downstream because it allows for a smoother flow of water. When the spigot is facing downstream, the water can flow freely without any obstructions or resistance. This ensures that the water can easily move through the pipe without causing any damage or blockages. Additionally, facing the spigot downstream helps to prevent any backflow or pressure buildup in the pipe, which can lead to leaks or bursts.Rate this question:
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- 37.
What can happen if the bell and spigot get dirty before connecting?
- A.
Cause leak
- B.
Contamination
- C.
Replacement at a later date if not detected during testing
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
If the bell and spigot get dirty before connecting, several things can happen. Firstly, it can cause leaks in the connection, as dirt and debris can prevent a tight seal from forming. Secondly, there is a risk of contamination, as the dirt can introduce harmful substances into the connection. Lastly, if the dirt is not detected during testing, it may require replacement at a later date, as the connection may not function properly. Therefore, all of the above consequences can occur if the bell and spigot get dirty before connecting.Rate this question:
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- 38.
What is the normal drop of sewer service lines?
- A.
1/2" per foot
- B.
1/4" per foot
- C.
0.1" per foot
- D.
0.01" per foot
Correct Answer
B. 1/4" per footExplanation
The normal drop of sewer service lines is 1/4" per foot. This means that for every one foot of horizontal distance, the sewer service line should have a vertical drop of 1/4 inch. This drop is necessary to ensure proper flow and prevent any blockages or backups in the sewer system.Rate this question:
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- 39.
When shall initial backfill of pipe take place?
- A.
Within 24 hours after laying pipe
- B.
By the next shift
- C.
Immediately after laying pipe
- D.
Within 4 hours after laying pipe
Correct Answer
C. Immediately after laying pipeExplanation
The correct answer is "Immediately after laying pipe". This is because the initial backfill of the pipe should be done as soon as possible after the pipe is laid to prevent any damage or movement of the pipe. By backfilling immediately, the soil around the pipe is compacted and stabilized, providing support and preventing any potential issues such as settling or shifting of the pipe. This ensures the integrity and stability of the pipe system.Rate this question:
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- 40.
What is primarily used as warning for trench?
- A.
Flags
- B.
Flashing lights
- C.
Signs
- D.
Tape
Correct Answer
D. TapeExplanation
Tape is primarily used as a warning for trenches because it is highly visible and can be easily placed around the perimeter of the trench. It serves as a visual barrier to alert people of the potential danger and to prevent accidental falls or entry into the trench. Additionally, tape can be easily removed and repositioned as needed, making it a convenient tool for marking and warning of trench hazards.Rate this question:
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- 41.
What is normal compaction % for subgrade under street?
- A.
80%
- B.
85%
- C.
90%
- D.
95%
Correct Answer
D. 95%Explanation
The correct answer is 95%. Compaction is a process that involves applying pressure to soil in order to reduce its volume and increase its density. In the case of subgrade under a street, it is important to achieve a high level of compaction to ensure stability and prevent settlement. A compaction percentage of 95% indicates that the soil has been compacted to a high degree, resulting in a dense and stable subgrade.Rate this question:
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- 42.
What parts of the sewer pipe system must is included when using water to test?
- A.
Service lines
- B.
Upstream and downstream manholes
- C.
House laterals from services lines
- D.
Only A and B
- E.
All
Correct Answer
D. Only A and BExplanation
When using water to test the sewer pipe system, the parts that must be included are the service lines and the upstream and downstream manholes. The service lines are the pipes that connect individual buildings to the main sewer line, and the manholes are access points for maintenance and inspection. Including these parts in the water test ensures that the system is properly functioning and there are no leaks or blockages. Therefore, the correct answer is "Only A and B".Rate this question:
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- 43.
Where are plugs located relative to upstream and downstream manholes for WATER test of sewer system?
- A.
One plug is located upstream from upstream manhole; other plug is located downstream from downstream manhole
- B.
One plug is located upstream from upstream manhole; other plug is located upstream from downstream manhole
- C.
One plug is located downstream from upstream manhole; other plug is located downstream from downstream manhole
- D.
One plug is located downstream from upstream manhole; other plug is located upstream from downstream manhole
Correct Answer
B. One plug is located upstream from upstream manhole; other plug is located upstream from downstream manholeExplanation
The correct answer states that one plug is located upstream from the upstream manhole, and the other plug is located upstream from the downstream manhole. This means that both plugs are placed in a position that is closer to the start of the sewer system rather than closer to the end. This arrangement allows for the testing of the entire length of the sewer system, as the flow of water will pass through both plugs and all the sections in between.Rate this question:
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- 44.
How long does 1st fill of water test take for new sewer pipe that goes up to 5 ft in upstream manhole?
- A.
4 hours
- B.
6 hours
- C.
12 hours
- D.
24 hours
Correct Answer
A. 4 hoursExplanation
The first fill of water test for a new sewer pipe that goes up to 5 ft in an upstream manhole takes 4 hours. This test is conducted to check for any leaks or defects in the sewer pipe. By filling the pipe with water and observing if there is any loss of water or increase in water level, any issues can be identified. The 4-hour duration allows enough time for any potential leaks or defects to become apparent.Rate this question:
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- 45.
How long does 2nd fill of water test take for new sewer pipe that refills test upstream manhole to 5ft after absorption?
- A.
Up to 24 hours
- B.
6-12 hours
- C.
1-2 hours
- D.
2-4 hours
Correct Answer
D. 2-4 hoursExplanation
The correct answer is 2-4 hours. This time frame is reasonable for the second fill of a water test for a new sewer pipe. It suggests that the pipe is able to refill the test upstream manhole to a depth of 5ft after absorption within this time frame. This duration allows for a sufficient assessment of the pipe's functionality and integrity.Rate this question:
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- 46.
Where are plugs located relative to upstream and downstream manholes for AIR test of sewer system?
- A.
One plug is located downstream from upstream manhole; other plug is located downstream from downstream manhole
- B.
One plug is located upstream from upstream manhole; other plug is located upstream from downstream manhole
- C.
One plug is located downstream from upstream manhole; other plug is located upstream from downstream manhole
- D.
None of the above
Correct Answer
C. One plug is located downstream from upstream manhole; other plug is located upstream from downstream manholeExplanation
In an AIR test of a sewer system, plugs are used to block off sections of the sewer line. The purpose of the test is to check for leaks or defects in the system. The correct answer states that one plug is located downstream from the upstream manhole, and the other plug is located upstream from the downstream manhole. This configuration allows for the section of the sewer line between the two plugs to be isolated and tested for leaks. Placing one plug downstream from the upstream manhole ensures that the test can be conducted in the correct direction of flow. Placing the other plug upstream from the downstream manhole allows for the section to be completely sealed off.Rate this question:
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- 47.
If specifications require you to backfill before testing, you should:
- A.
Backfill completely and then test for leakage.
- B.
Backfill partially and then test for leakage
- C.
Conduct your own test before backfilling to identify leakage and then test again after backfilling.
- D.
None of the above.
Correct Answer
C. Conduct your own test before backfilling to identify leakage and then test again after backfilling.Explanation
When specifications require backfilling before testing, it is important to conduct a test before backfilling to identify any potential leakage. This initial test allows for the detection and resolution of any leakage issues before proceeding with the backfilling process. After the backfilling is complete, another test should be conducted to ensure that the backfilled area is free from any leakage. This approach ensures that any leakage is identified and addressed both before and after the backfilling, ensuring the integrity of the project.Rate this question:
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- 48.
If a leak is found during water testing of sewer pipe, what needs to be checked for leaking?
- A.
Manhole and its joints
- B.
Pipe and its joints
- C.
Plugs
- D.
A and B only
- E.
All
Correct Answer
E. AllExplanation
All of the options need to be checked for leaking. If a leak is found during water testing of a sewer pipe, it is important to inspect all possible areas where the leak could be occurring. This includes checking the manhole and its joints, as well as the pipe and its joints. Additionally, plugs should also be examined to ensure they are not causing any leaks. By inspecting all of these components, any potential leaks can be identified and addressed promptly.Rate this question:
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- 49.
Which test of sewer pipe is considered faster, cleaner and less expensive?
- A.
Pressure testing
- B.
Air testing
- C.
Water testing
- D.
Sewer testing
Correct Answer
B. Air testingExplanation
Air testing is considered faster, cleaner, and less expensive compared to other tests for sewer pipes. This is because air testing involves pressurizing the pipe with air and checking for any leaks or pressure drops. It does not require filling the pipe with water or using any other substances, making it a cleaner method. Additionally, air testing is usually quicker to perform and does not require as much equipment or resources, resulting in lower costs.Rate this question:
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- 50.
What is one advantage of air testing over water testing of sewer pipe?
- A.
Can be done before manholes are built.
- B.
Can be done without engineer approval.
- C.
Can be done before pipes are laid.
- D.
Can be done with partial backfill only.
Correct Answer
A. Can be done before manholes are built.Explanation
Air testing of sewer pipes can be done before manholes are built because it does not require access to the manholes. This means that the testing can be conducted earlier in the construction process, allowing for any necessary repairs or adjustments to be made before the manholes are built. This can help to prevent any potential issues or delays that may arise from testing after the manholes are in place.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
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Feb 15, 2013Quiz Created by
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