CDC 3e251 Set B Vol. 3
This quiz will cover all URE multiple choice questions from Vol. 3 of the B-Set of Pavements and Construction Equipment Operator 5-Level upgrade course. All questions are taken directly from the UREs and the multiple choice options are the same. Correct answers reflect the correct answers from the CDC themselves and not necessarily the correct answers from the CERTest.
Questions and Answers
- 1.
The purpose of revetments is to...
- A.
Protect parked aircraft and essential facilities
- B.
Construct contingency water storage tanks
- C.
Store uneeded fill material
- D.
Serve as attack decoys
Correct Answer
A. Protect parked aircraft and essential facilitiesExplanation
Revetments are structures built to protect parked aircraft and essential facilities. They act as a barrier against potential damage caused by natural disasters, such as floods or high winds, as well as protect against potential attacks. By providing a physical barrier, revetments ensure the safety and security of parked aircraft and essential facilities, minimizing the risk of damage and ensuring their operational readiness.Rate this question:
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- 2.
How are the sides and cross panels of the A-1 and B-1 revetments held together?
- A.
They are bolted together
- B.
They are welded together
- C.
They are held together with pins
- D.
Sandbags are palced against them
Correct Answer
C. They are held together with pinsExplanation
The sides and cross panels of the A-1 and B-1 revetments are held together with pins. This means that the different components of the revetments are joined and secured using pins, which provide stability and strength to the structure.Rate this question:
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- 3.
The best way to repair damage to a large section of revetment is to...
- A.
Remove the damaged section
- B.
Replace the entire revetment
- C.
Weld patches over the damage
- D.
Cut the damaged panel and patch it
Correct Answer
A. Remove the damaged sectionExplanation
The best way to repair damage to a large section of revetment is to remove the damaged section. This is because removing the damaged section allows for a clean and effective repair. By removing the damaged section, it ensures that there are no weak points or compromised areas left in the revetment. Additionally, removing the damaged section allows for a proper assessment of the extent of the damage, which can help determine if any other repairs or reinforcements are needed.Rate this question:
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- 4.
What two types of concrete revetments are replacing A-1 and B-1 revetments?
- A.
ARMCO and barrels
- B.
Bitburg and ARMCO
- C.
Concrete bins and barrels
- D.
Bitburg and concrete bins
Correct Answer
D. Bitburg and concrete binsExplanation
The correct answer states that Bitburg and concrete bins are the two types of concrete revetments replacing A-1 and B-1 revetments. This implies that the previous revetments, A-1 and B-1, are being replaced by Bitburg and concrete bins.Rate this question:
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- 5.
Concertainer revetments are lined with a...
- A.
Cotton liner
- B.
Plastic liner
- C.
Sandbag liner
- D.
Geofabric liner
Correct Answer
D. Geofabric linerExplanation
Concertainer revetments are structures used for erosion control and flood protection. They are made up of wire mesh baskets filled with soil or other materials. A geofabric liner is a suitable choice for lining these revetments because it is a permeable material that allows water to pass through while retaining the soil inside the baskets. This prevents erosion and provides stability to the revetments. Geofabric liners are also durable and resistant to degradation, making them an ideal option for long-term protection against erosion and flooding.Rate this question:
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- 6.
What is the minimum amount of people required to errect a concertainer revetment?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
B. 2Explanation
A concertainer revetment is a type of protective structure made from wire mesh containers filled with soil or other materials. Erecting a concertainer revetment typically involves lifting and placing the containers in a specific arrangement. While it is possible for one person to lift and place the containers, it is generally more efficient and safer to have at least two people working together. One person can hold and guide the container while the other person provides support and helps with the lifting. Therefore, the minimum amount of people required to erect a concertainer revetment is 2.Rate this question:
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- 7.
Concertainer revetmenst are held together using...
- A.
Rebar
- B.
Zip strips
- C.
Angle irons
- D.
Connecting pins
Correct Answer
D. Connecting pinsExplanation
Concertainer revetments are structures made of wire mesh containers filled with soil or other materials to prevent erosion or provide protection against floods. These containers are held together using connecting pins, which secure the adjacent units and maintain the overall stability of the revetment system. Rebar, zip strips, and angle irons are not typically used for this purpose.Rate this question:
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- 8.
Concertainer revetments provide the same protection as...
- A.
A-1
- B.
B-1
- C.
Concrete bins
- D.
Bitburg revetments
Correct Answer
B. B-1Explanation
Concertainer revetments provide the same protection as Bitburg revetments.Rate this question:
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- 9.
Which is considered to be a quick and easily constructed temporary culvert?
- A.
Lean-to
- B.
Sandbag
- C.
Small piping
- D.
Steel planking
Correct Answer
A. Lean-toExplanation
A lean-to is considered to be a quick and easily constructed temporary culvert. A lean-to is a simple shelter made by leaning one side of a roof against a wall or tree, providing a sloping roof that can redirect water flow. It can be easily constructed using available materials such as branches, leaves, and tarpaulin. This temporary culvert can be quickly assembled in emergency situations to divert water and prevent flooding.Rate this question:
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- 10.
Which culvert is desgined to withstand heavy water flow?
- A.
Log
- B.
Lean-to
- C.
Sandbag
- D.
Metal planking
Correct Answer
A. LogExplanation
A log is designed to withstand heavy water flow because it is a large, solid piece of wood that can withstand the force of rushing water. Logs are often used in construction projects such as culverts because they are sturdy and can effectively divert or channel water away from an area. Additionally, logs are naturally buoyant, which means they are less likely to be swept away by the force of the water. Therefore, using a log as a culvert is a reliable choice when heavy water flow needs to be managed.Rate this question:
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- 11.
You place sandbags, canvas, or burlap sacks around a metal planking culvert in order to...
- A.
Reduce voids around the culvert
- B.
Give more strength to the culvert
- C.
Keep debris from falling into the culvert
- D.
Give the culvert a better water-tight seal
Correct Answer
D. Give the culvert a better water-tight sealExplanation
Placing sandbags, canvas, or burlap sacks around a metal planking culvert helps to give the culvert a better water-tight seal. By filling the voids around the culvert with these materials, it prevents water from seeping through and ensures that the culvert remains watertight. This additional layer acts as a barrier, reducing the risk of water leakage and improving the overall integrity of the culvert.Rate this question:
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- 12.
You are preparing to construct a timber bridge: for this task, your most important consideration is to...
- A.
Determine if the bridge is a permanent or temporary type of construction
- B.
Ensure the bridge is constructed according to its projected use
- C.
Ensure the bridge is constructed to withstand heavy loads
- D.
Decide where the bridge is to be located
Correct Answer
B. Ensure the bridge is constructed according to its projected useExplanation
The most important consideration when constructing a timber bridge is to ensure that it is constructed according to its projected use. This means that the bridge should be designed and built to meet the specific requirements and demands of its intended purpose. Factors such as the expected traffic volume, the weight of the loads it will carry, and the environmental conditions it will be exposed to should all be taken into account during the construction process to ensure that the bridge is safe, durable, and efficient.Rate this question:
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- 13.
If at all possible, the construction of a soil-cement road should be restricted during...
- A.
Peace time
- B.
Dry periods
- C.
Nighttime
- D.
Freezing weather
Correct Answer
D. Freezing weatherExplanation
During freezing weather, the water in the soil can freeze, causing the soil to expand and potentially crack or break apart. This can lead to a weakened road structure and result in potholes or other damage. Therefore, it is best to restrict the construction of a soil-cement road during freezing weather to ensure its durability and longevity.Rate this question:
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- 14.
When treating a coil-cement road area for final finishing, you divide the areas into sections. The purpose of this is to...
- A.
Reduce the cement content
- B.
Make the areas easier to work
- C.
Lessen the equipment that is needed
- D.
Make it possible to complete and area in one working day
Correct Answer
D. Make it possible to complete and area in one working dayExplanation
Dividing the coil-cement road area into sections allows for easier management and completion of each section within a single working day. By breaking down the area, the workers can focus on one section at a time, ensuring that it is properly finished before moving on to the next section. This approach helps in efficient utilization of time and resources, allowing for timely completion of the entire area.Rate this question:
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- 15.
A sanitary landfill should NOT be located near...
- A.
A spring
- B.
A mjor highway
- C.
Railroad tracks
- D.
Power lines
Correct Answer
A. A springExplanation
A sanitary landfill should not be located near a spring because springs are natural sources of water that emerge from the ground. If a landfill is situated near a spring, there is a high risk of contamination. The pollutants and toxins from the landfill can seep into the groundwater, which can then flow into the spring, contaminating the water source. This can have detrimental effects on the environment and public health, as the contaminated water can be used for drinking, irrigation, and other purposes. Therefore, it is crucial to avoid locating a landfill near a spring to protect the integrity and safety of the water source.Rate this question:
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- 16.
When abandoning a sanitary ladnfill trench, cover it with at least...
- A.
1 foot of material
- B.
2 feet of material
- C.
3 feet of material
- D.
4 feet of material
Correct Answer
B. 2 feet of materialExplanation
When abandoning a sanitary landfill trench, it is recommended to cover it with at least 2 feet of material. This is necessary to prevent the exposure of waste and to control odors, vectors, and potential contamination of groundwater. A thicker layer of covering material helps to ensure the proper containment and isolation of the waste, minimizing any potential environmental impacts.Rate this question:
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- 17.
Where do you palce stones that weight LESS than 10 pounds during constructionof berms or dykes?
- A.
Top of berm
- B.
Lower center of the berm
- C.
Lower outside of berm
- D.
Stones under 10 pounds should never be used
Correct Answer
B. Lower center of the bermExplanation
Stones that weigh less than 10 pounds are placed in the lower center of the berm during construction. This placement helps to provide stability and support to the berm, as the heavier stones are typically placed on the top for added weight and strength. Placing the lighter stones in the lower center ensures that they still contribute to the overall stability of the berm, while also allowing for proper weight distribution.Rate this question:
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- 18.
Which fuel bladder berm is least desirable?
- A.
Above ground level
- B.
Below ground level
- C.
Constructed from earth fill
- D.
Constructed with a flat top
Correct Answer
A. Above ground levelExplanation
An above ground level fuel bladder berm is least desirable because it poses a higher risk of leakage or rupture, leading to potential fuel spills and environmental contamination. Being above ground level makes it more susceptible to damage from external factors such as weather conditions, accidental impacts, or vandalism. Additionally, an above ground level berm may require additional safety measures and maintenance to prevent any potential hazards. Therefore, it is considered the least desirable option compared to the other choices provided.Rate this question:
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- 19.
Which materials can you use to prevent berm erosion?
- A.
Sod
- B.
Clay
- C.
Soil-cement
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
All of the materials mentioned, sod, clay, and soil-cement, can be used to prevent berm erosion. Sod is a layer of grass and soil that can stabilize the berm and prevent erosion. Clay is a compactable material that can be used to build up the berm and create a barrier against erosion. Soil-cement is a mixture of soil, cement, and water that can be used to create a hard, durable surface on the berm, preventing erosion. Therefore, all of these materials are effective in preventing berm erosion.Rate this question:
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- 20.
In the event fuel should catch fire in the berm, what can you do to prevent the remaining fuel from burning?
- A.
Flood the berm with water
- B.
Dump sand into the berm
- C.
Pump the fuel out
- D.
Open the drain
Correct Answer
D. Open the drainExplanation
Opening the drain would allow the fuel to flow out of the berm, preventing it from burning. By removing the fuel, there would be no source for the fire to continue burning. This action would help to minimize the risk of the fire spreading and causing further damage.Rate this question:
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- 21.
What is one of the first things you do after constructing a lagoon?
- A.
Construct fire breaks
- B.
Slope the lagoon walls
- C.
Dispose of excess materials
- D.
Secure the area with fencing
Correct Answer
D. Secure the area with fencingExplanation
After constructing a lagoon, one of the first things to do is to secure the area with fencing. This is important to prevent unauthorized access and ensure safety. Fencing helps to keep people and animals away from the lagoon, reducing the risk of accidents or contamination. It also serves as a boundary marker, clearly defining the area and indicating that it is a restricted zone. By securing the area with fencing, potential hazards can be minimized, and the lagoon can be properly protected and maintained.Rate this question:
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- 22.
The purpose of building adjustable outlet pipes to extend through the lagoon's berm is to...
- A.
Increase evaporation
- B.
Act as irrigation valves
- C.
Increase the lagoon intake
- D.
Control the operating depth
Correct Answer
D. Control the operating depthExplanation
The purpose of building adjustable outlet pipes to extend through the lagoon's berm is to control the operating depth. By adjusting the height of the outlet pipes, the depth of the lagoon can be regulated. This allows for better management of water levels, ensuring that the lagoon is not too shallow or too deep. It provides flexibility in controlling the amount of water in the lagoon, which is important for various purposes such as flood control, water storage, and maintaining ecological balance.Rate this question:
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- 23.
You slope the bottom of evaporation lagoons for...
- A.
Quick and complete draining
- B.
To increase the storage capacity
- C.
Maintain the berm walls
- D.
To decrease vegetation
Correct Answer
A. Quick and complete drainingExplanation
The bottom of evaporation lagoons is sloped for quick and complete draining. This means that the slope allows the water in the lagoons to flow easily and efficiently towards the drainage system, ensuring that the lagoons can be emptied quickly and completely when needed. This is important for various reasons, such as preventing flooding, facilitating maintenance and cleaning, and ensuring proper functioning of the lagoons.Rate this question:
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- 24.
What is the first thing to assemble on the temper tent?
- A.
Window sections
- B.
End sections
- C.
Tent frame
- D.
The fly
Correct Answer
C. Tent frameExplanation
The first thing to assemble on the temper tent is the tent frame. This is because the tent frame provides the structure and support for the entire tent. Once the frame is assembled, the other components such as the window sections, end sections, and the fly can be attached to complete the assembly of the temper tent.Rate this question:
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- 25.
We join the sections of the temper tents together with...
- A.
Snaps
- B.
Beckets
- C.
Zippers
- D.
Buttons
Correct Answer
B. BecketsExplanation
Beckets are strong loops or handles that are used to join or secure different sections of the temper tents together. They provide a secure and reliable connection between the sections, ensuring that the tent remains stable and intact. Snaps, zippers, and buttons are not typically used for joining tent sections together as they may not provide the same level of strength and stability as beckets.Rate this question:
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- 26.
How many sections of the temper tent do the fly sections cover?
- A.
1
- B.
2
- C.
3
- D.
5
Correct Answer
B. 2Explanation
The fly sections of the temper tent cover 2 sections.Rate this question:
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- 27.
When disassembling sections of the temper tent, when do you remove a single ply floor?
- A.
Before you remove the liner
- B.
Before you start disassembly
- C.
After you remove the tent frame
- D.
After you remove all internal components
Correct Answer
D. After you remove all internal componentsExplanation
The correct answer is "After you remove all internal components." This means that the single ply floor should be removed after all the internal components of the temper tent have been taken out. Removing the floor at this stage ensures that it doesn't get damaged or hinder the disassembly process.Rate this question:
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- 28.
What is the newest all-purpose tent type shelter used by the Air Force?
- A.
Temper Tent system
- B.
GP Medium system tent
- C.
GP Large system tent
- D.
Small Shelter System
Correct Answer
D. Small Shelter SystemExplanation
The Small Shelter System is the newest all-purpose tent type shelter used by the Air Force. This implies that the other options mentioned, such as the Temper Tent system, GP Medium system tent, and GP Large system tent, are not as recent or commonly used by the Air Force.Rate this question:
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- 29.
The Small Shelter System tent can easily withstand wind loads of...
- A.
50 knots
- B.
40 knots
- C.
30 knots
- D.
20 knots
Correct Answer
A. 50 knotsExplanation
The Small Shelter System tent is designed to withstand wind loads of 50 knots. This means that it is capable of withstanding a strong wind speed of 50 knots without being damaged or collapsing. The tent is built with materials and construction techniques that make it sturdy and resistant to high winds, providing a safe and secure shelter even in challenging weather conditions.Rate this question:
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- 30.
How many types of liners does the Small Shelter System Tent use?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
C. 3Explanation
The Small Shelter System Tent uses three types of liners.Rate this question:
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- 31.
Which liner do you install first when errecting the Small Shelter System Tent?
- A.
Mid liner
- B.
End liner
- C.
Side liner
- D.
Any liner
Correct Answer
A. Mid linerExplanation
The mid liner is installed first when erecting the Small Shelter System Tent. This is because the mid liner acts as the central support structure for the tent, providing stability and structure to the overall system. Once the mid liner is in place, the end liner and side liner can be installed to further reinforce the tent and create a complete enclosure. The mid liner is therefore the crucial first step in the installation process.Rate this question:
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- 32.
The Evironmental Control Unit should be at least how many feet away from the SSS Tent?
- A.
12 inches
- B.
15 inches
- C.
24 inches
- D.
30 inches
Correct Answer
A. 12 inchesExplanation
The Environmental Control Unit should be at least 12 inches away from the SSS Tent. This distance is necessary to ensure proper ventilation and to prevent any potential hazards or damage caused by the heat or exhaust produced by the unit. Placing the unit too close to the tent could pose a risk of fire or overheating. Therefore, it is important to maintain a minimum distance of 12 inches between the Environmental Control Unit and the SSS Tent.Rate this question:
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- 33.
Inspect the Small Shelter System Tent electric cable assemblies every...
- A.
10 days
- B.
20 days
- C.
30 days
- D.
60 days
Correct Answer
C. 30 daysExplanation
The Small Shelter System Tent electric cable assemblies should be inspected every 30 days. This regular inspection ensures that the cables are in good condition and functioning properly. By inspecting them at this frequency, any potential issues or damage can be identified and addressed promptly, reducing the risk of electrical hazards or malfunctions.Rate this question:
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- 34.
When the shelter is placed in storage for lengthy periods, inspect it at...
- A.
Monthly intervals
- B.
Quarterly intervals
- C.
Four month intervals
- D.
Six month intervals
Correct Answer
D. Six month intervalsExplanation
The correct answer is six month intervals because when the shelter is placed in storage for lengthy periods, it is important to inspect it regularly to ensure that it is in good condition and ready for use. Inspecting the shelter every six months allows for enough time to pass to identify any potential issues or damages that may have occurred during storage, without waiting too long that any problems worsen or become irreparable. This interval strikes a balance between frequent enough inspections to catch any issues and not being overly burdensome or time-consuming.Rate this question:
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- 35.
When you are making a repair to a small tear on the Small Shelter System Tent, the patch material must extend a minimum of how many inches around all sides of the tear?
- A.
1 inch
- B.
2 inches
- C.
3 inches
- D.
4 inches
Correct Answer
C. 3 inchesExplanation
When making a repair to a small tear on the Small Shelter System Tent, it is necessary for the patch material to extend a minimum of 3 inches around all sides of the tear. This is important to ensure that the patch covers the entire damaged area and provides sufficient reinforcement to prevent further tearing or damage to the tent. A smaller patch may not adequately cover the tear and may leave the tent vulnerable to further damage.Rate this question:
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- 36.
How many, if any, damaged parts can you have on an oxyacetalene welding system and still be able to uyse the system?
- A.
0
- B.
1
- C.
2
- D.
3
Correct Answer
A. 0Explanation
An oxyacetylene welding system requires all its parts to be in good condition in order to function properly. Any damaged part can compromise the safety and effectiveness of the system. Therefore, having even one damaged part would make it impossible to use the system. Hence, the correct answer is 0.Rate this question:
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- 37.
How many, if any, damaged parts can you have on an oxyacetylene welding system and still be able to use the system?
- A.
None
- B.
One
- C.
Two
- D.
Three
Correct Answer
A. NoneExplanation
An oxyacetylene welding system requires all parts to be in good condition in order to function properly and safely. Even a single damaged part can compromise the effectiveness of the system and potentially lead to accidents or malfunctions. Therefore, it is not possible to have any damaged parts and still be able to use the system.Rate this question:
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- 38.
What is used inside acetylene cylinders to stabilized the pressurized acetylene?
- A.
Argon
- B.
Oxygen
- C.
Acetone
- D.
Nitrogen
Correct Answer
C. AcetoneExplanation
Acetone is used inside acetylene cylinders to stabilize the pressurized acetylene. Acetone acts as a solvent and helps to keep the acetylene in a stable state, preventing it from decomposing or becoming explosive. It helps to maintain the pressure inside the cylinder and ensures the safe storage and transportation of acetylene.Rate this question:
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- 39.
Oxygen and acetylene hoses are colored...
- A.
Red and green respectively
- B.
Green and black respectively
- C.
Green and black or red or maroon respectively
- D.
Red or black and maroon or green respectively
Correct Answer
C. Green and black or red or maroon respectivelyExplanation
The correct answer is green and black or red or maroon respectively. Oxygen hoses are typically colored green, while acetylene hoses are colored black or red. However, in some cases, the acetylene hose may also be colored maroon. Therefore, the correct answer is a combination of these colors.Rate this question:
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- 40.
Why must you crack open each cylinder outlet valve before you attach regulators?
- A.
To loosen the cylinder valve
- B.
To see if there is pressure in the cylinder
- C.
To blow out any dirt lodged in the outlet nipple
- D.
The cylinder valves should not be opened before the regulators are attached
Correct Answer
C. To blow out any dirt lodged in the outlet nippleExplanation
Before attaching regulators, it is necessary to crack open each cylinder outlet valve to blow out any dirt that may be lodged in the outlet nipple. This is important because if there is any dirt or debris present, it can potentially clog the regulators or cause damage to the equipment. By cracking open the cylinder outlet valve, any dirt or debris can be expelled, ensuring proper functioning of the regulators and preventing any potential issues or blockages.Rate this question:
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- 41.
When assembling oxyacetylene equipment, you open the acetylene cylinder valve a maximum of...
- A.
1 turn
- B.
1-1/4 turns
- C.
1-1/2 turns
- D.
1/2 turn
Correct Answer
C. 1-1/2 turnsExplanation
When assembling oxyacetylene equipment, it is recommended to open the acetylene cylinder valve a maximum of 1-1/2 turns. This allows for a sufficient flow of acetylene gas while still maintaining control and safety. Turning the valve too much or too little can result in insufficient or excessive gas flow, which can be dangerous. Therefore, opening the valve 1-1/2 turns is the appropriate amount to ensure a proper and safe operation of the oxyacetylene equipment.Rate this question:
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- 42.
A safety feature of oxyacetylene equipment is that...
- A.
Acetylene connections have right hand threads and and oxygen connections have left hand threads
- B.
Acetylene connections have left hand threads and and oxygen connections have right hand threads
- C.
All connections have right hand threads
- D.
All connections have left hand threads
Correct Answer
B. Acetylene connections have left hand threads and and oxygen connections have right hand threadsExplanation
The safety feature of oxyacetylene equipment is that acetylene connections have left hand threads and oxygen connections have right hand threads. This is important because it prevents accidental interchange of the two gases, as the left hand threads on the acetylene connections are not compatible with the right hand threads on the oxygen connections. This ensures that the gases are always connected correctly, reducing the risk of explosions or other hazards.Rate this question:
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- 43.
When lighting the oxyacetylene torch you open the...
- A.
Oxygen valve first
- B.
Acetylene valve first
- C.
Oxygen and acteylene valves 1-1/2 turns
- D.
Oxygen and acetyelene valves all the way open
Correct Answer
B. Acetylene valve firstExplanation
When lighting an oxyacetylene torch, it is important to open the acetylene valve first. This is because acetylene is a flammable gas and should be ignited first before introducing oxygen. By opening the acetylene valve first, you can create a small flame that can be adjusted to the desired size. Once the acetylene flame is established, the oxygen valve can be gradually opened to achieve the desired flame intensity.Rate this question:
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- 44.
Why is a pure acteylene flame smoky?
- A.
It has a high percentage of oxides in it
- B.
Because there is not enough oxygen in the air to burn the acetylene completely
- C.
It has a high percentage od nitrides in it
- D.
There is not enough hydrogen in the air to burn the acetylene completely?
Correct Answer
B. Because there is not enough oxygen in the air to burn the acetylene completelyExplanation
A pure acetylene flame is smoky because there is not enough oxygen in the air to burn the acetylene completely. Incomplete combustion occurs when there is insufficient oxygen available for the reaction, resulting in the production of soot and smoke. Acetylene requires a specific ratio of oxygen to burn cleanly and efficiently. When this ratio is not met, carbon particles are formed, leading to the smoky flame.Rate this question:
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- 45.
Which oxyacteylene welding flame produces a white streamer or "feather" of acetylene at the end of the inner cone?
- A.
Neutral
- B.
Oxidizing
- C.
Acetyelene
- D.
Carbonizing
Correct Answer
D. CarbonizingExplanation
The carbonizing flame produces a white streamer or "feather" of acetylene at the end of the inner cone. This is because the carbonizing flame has an excess of acetylene, which is not completely burned and results in the formation of carbon particles. These carbon particles create the white streamer or "feather" at the end of the flame.Rate this question:
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- 46.
When closing down an Oxyacetylene unit, which valve do you close first?
- A.
Cylinder valves?
- B.
Flashback arresters
- C.
Oxygen torch valves
- D.
Acetylene torch valves
Correct Answer
C. Oxygen torch valvesExplanation
When closing down an Oxyacetylene unit, it is important to close the oxygen torch valves first. This is because oxygen supports combustion and is highly flammable, so shutting off the oxygen supply first ensures that any potential fire or explosion risks are minimized. By closing the oxygen torch valves before any other valves, the flow of oxygen is stopped, reducing the chances of accidents or hazards occurring during the shutdown process.Rate this question:
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- 47.
To relieve the pressure on the diaphragm of a two-stage oxyactylene regulator, you...
- A.
Turn the adjusting screw counter clockwise
- B.
Open both torch valves at the same time
- C.
Open the torch valves one at a time
- D.
Turn the adjusting screw clockwise
Correct Answer
A. Turn the adjusting screw counter clockwiseExplanation
To relieve the pressure on the diaphragm of a two-stage oxyactylene regulator, you turn the adjusting screw counter clockwise. This action allows the diaphragm to move downwards, reducing the pressure in the regulator. Turning the screw clockwise would increase the pressure, which is not the desired outcome. Opening both torch valves at the same time or opening the torch valves one at a time would not directly affect the pressure on the diaphragm.Rate this question:
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- 48.
If a flashback occurs in oxyacetylene welding equipment, your first action should be to immediately close the...
- A.
Oxygen torch valve
- B.
Actyelene torch valve
- C.
Oxygen cylinder valve
- D.
Oxygen and actylene valves simultaneously
Correct Answer
A. Oxygen torch valveExplanation
In the event of a flashback occurring in oxyacetylene welding equipment, the first action should be to immediately close the oxygen torch valve. This is because a flashback is a dangerous situation where the flame travels back into the torch and can potentially cause an explosion. By closing the oxygen torch valve, the oxygen supply to the flame is cut off, reducing the risk of further combustion and allowing for the situation to be safely addressed.Rate this question:
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- 49.
How is cutting oxygen released from the high pressure oxygen valve on the oxyactyelene cutting torch?
- A.
By a trigger or lever
- B.
Through a release valve
- C.
Through the central orifice
- D.
Through the oxygen regulator
Correct Answer
A. By a trigger or leverExplanation
The cutting oxygen is released from the high pressure oxygen valve on the oxyacetylene cutting torch by a trigger or lever. This mechanism allows the user to control the flow of oxygen and initiate the cutting process. By activating the trigger or lever, the valve opens, allowing the pressurized oxygen to flow through the torch and mix with the acetylene gas, resulting in a high-temperature flame that can cut through metal.Rate this question:
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- 50.
What flows through the center orifice of an oxyacetylene cutting torch tip?
- A.
Preheated argon
- B.
Cutting oxygen
- C.
Cutting acetylene
- D.
Preheated oxygen and acetylene
Correct Answer
B. Cutting oxygenExplanation
The correct answer is cutting oxygen because in an oxyacetylene cutting torch, oxygen is used as the primary gas for the cutting process. The oxygen reacts with the metal being cut, creating a chemical reaction that generates intense heat and allows for the metal to be cut through. The acetylene gas is used as a fuel source to ignite and sustain the cutting process, but it is the cutting oxygen that actually flows through the center orifice of the torch tip to facilitate the cutting process.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
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Feb 28, 2013Quiz Created by
Johnr21077
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