| 1 |
What is the primary advantage of using cup lump rubber (CLR) in cold mix asphalt (CMA)?
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Improves functional properties of the asphalt |
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it make it work better |
reference
https://encyclopedia.pub/entry/43806
" pavement performed better in surface conditions with a high roughness value, structural condition, skid resistance and dynamic creep" |
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| 2 |
Which property of CMA is significantly improved by the addition of CLR?
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Tensile strength |
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it stronger with CLR than without it |
Reference
https://encyclopedia.pub/entry/43806
"pavement performed better in surface conditions with a high roughness value, structural condition, skid resistance and dynamic creep" |
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| 3 |
If the tensile strength of CMA increases by 26% due to the addition of CLR and the original tensile strength was 5 MPa, what is the new tensile strength?
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6.3 MPa |
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Given:Original Tensile Strength = 5 MPA and PaIncrease Percentage = 26%
New Tensile Strength = 5 + (5 * 0.26) New Tensile Strength = 5 + 1.3 New Tensile Strength = 6.3 MPa
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Given:Original Tensile Strength = 5 MPA and PaIncrease Percentage = 26%
New Tensile Strength = 5 + (5 * 0.26) New Tensile Strength = 5 + 1.3 New Tensile Strength = 6.3 MPa
Therefore, the new tensile strength of CMA after the addition of CLR and a 26% increase is 6.3 MPa. |
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| 4 |
Given that the rut depth decreases by 70% when CLR is added to CMA and the original rut depth was 10 mm, what is the new rut depth?
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To calculate the new rut depth after a 70% decrease due to the addition of CLR
formula: New Rut Depth = Original Rut Depth - (Original Rut Depth * Decrease Percentage)
We have Original Rut Depth = 10 mm and Decrease Percentage = 70%
New Rut Depth = 10 - (10 * 0.70) New Rut Depth = 10 - 7 New Rut Depth = 3 mm |
We have Original Rut Depth = 10 mm and Decrease Percentage = 70%
New Rut Depth = 10 - (10 * 0.70) New Rut Depth = 10 - 7 New Rut Depth = 3 mm |
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| 5 |
If the CMA with CLR has a TSR (Tensile Strength Ratio) value of 104% and the minimum requirement is 80%, by what percentage does the TSR exceed the requirement?
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30% |
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formula : Percentage Exceeding Requirement = (TSR Value - Minimum Requirement) / Minimum Requirement * 100%
And we now got TSR Value = 104% and Minimum Requirement = 80%
so Percentage Exceeding Requirement = 30% |
formula : Percentage Exceeding Requirement = (TSR Value - Minimum Requirement) / Minimum Requirement * 100% |
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| 6 |
What is the potential increase in moisture damage resistance for CMA-CR compared to conventional CMA if the improvement is 12%?
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12% |
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it increase from x to x that improvement by 12% so how different is x and x that improve by12?
it increase by 12% too |
Potential Increase = 12 / 100 * 100 = 12% |
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| 7 |
If the shear resistance of CLR-modified CMA increases due to the membrane effect, which physical property is most directly influenced?
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Elasticity |
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The membrane effect enhances the elasticity of the material, contributing to increased shear resistance |
https://encyclopedia.pub/entry/43806 |
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| 8 |
The viscosity of CLR-modified bitumen at 135°C is 1.16 Pa·s. If the shear rate is 50 s^-1, what is the shear stress?
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58 Pa |
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Shear Stress = 1.16 Pa·s x 50 s^-1 Shear Stress = 58 Pa |
Shear Stress = Viscosity x Shear Rate
and we have : Viscosity = 1.16 Pa·s and Shear Rate that is 50 s^-1
so Shear Stress = 1.16 Pa·s x 50 s^-1 Shear Stress = 58 Pa |
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| 9 |
If the mass loss in the Cantabro test for CMA-CR is 14.6% and the maximum accepted limit is 20%, by how much does CMA-CR fall below the limit?
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5.4% |
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let say you have a cup that can hold 20 ml of water and you now have 14.6 ml of water in it how much do you have to add untill it overflow?
yes, You can fill it 5.4 ml more to make it over flow. |
Difference = 20% - 14.6% = 5.4 |
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| 10 |
What is the significance of using cup lump rubber in the context of environmental sustainability?
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It helps in lowering carbon emissions during production. |
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It lower carbon in the process |
https://encyclopedia.pub/entry/43806 |
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| 11 |
What is one of the emerging trends affecting China's oil and gas pipeline development strategies?
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Digitization |
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They aim to make it better in term tecnology |
https://www.sciencedirect.com/science/article/pii/S2950276424000035#sec0015 |
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| 12 |
What is the proportion of natural gas pipelines in the total length of long-distance oil and gas pipelines in China as of 2022?
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50% |
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https://www.energypolicy.columbia.edu/inside-chinas-2023-natural-gas-development-report/ |
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| 13 |
If the total length of long-distance oil and gas pipelines in China is 180,000 km, how many kilometers are dedicated to natural gas pipelines?
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108,000 km |
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https://www.energypolicy.columbia.edu/inside-chinas-2023-natural-gas-development-report/ |
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| 14 |
According to the article, if the target length for oil and gas pipelines is 210,000 km by 2025, how many kilometers need to be constructed from the 2022 total?
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30,000 km |
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Calculate the additional length needed: Additional length = Target length - Total length in 2022 Additional length = 210,000 km - 180,000 km Additional length = 30,000 km |
Calculate the additional length needed: Additional length = Target length - Total length in 2022 Additional length = 210,000 km - 180,000 km Additional length = 30,000 km |
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| 15 |
If the failure rate of oil and gas pipelines in Europe is 0.29 per year per hundred kilometers, what is the failure rate per year for a pipeline network of 1,000 kilometers?
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2.9 failures |
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it 0.29 * 10 = 2.9 |
it 0.29 * 10 = 2.9 |
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| 16 |
What is one of the main causes of oil and gas pipeline failures in China according to the article?
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Oil theft through drilling |
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other awnser is stright up nonsense |
other awnser is stright up nonsense |
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| 17 |
Assuming the failure rate in the United States is 0.14 per year per hundred kilometers, calculate the expected number of failures per year for a 1,500 kilometers pipeline network.
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2.1 failures |
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First, convert the failure rate from per hundred kilometers to per kilometer: Failure rate per kilometer = 0.14 / 100 Failure rate per kilometer = 0.0014 then 1500*0.0014 |
First, convert the failure rate from per hundred kilometers to per kilometer: Failure rate per kilometer = 0.14 / 100 Failure rate per kilometer = 0.0014 then 1500*0.0014 |
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| 18 |
If a pipeline defect inspection technology improves detection efficiency by 25% and the current detection efficiency is 80%, what will be the new detection efficiency?
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100% |
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80% x 25% Improvement = 0.80 x 0.25 Improvement = 0.20 then 80% + 20% New detection efficiency = 100% |
80% + 20% New detection efficiency = 100% |
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| 19 |
If a vibration signal monitoring system faces a 15% reduction in noise levels due to a new technology and the original noise level was 200 units, what is the new noise level?
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170 units |
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first 200 * 15% = 30 then
New noise level: New noise level = Original noise level - Reduction New noise level : 200 units - 30 units New noise level = 170 units |
first 200 * 15% = 30 then
New noise level: New noise level = Original noise level - Reduction New noise level : 200 units - 30 units New noise level = 170 units |
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| 20 |
For a hydrogen pipeline with an embrittlement rate of 0.05% per year, calculate the total embrittlement after 10 years.
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0.5% |
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if 1 year = 0.05% then 10 year is just 10*0.05 = 0.5 |
if 1 year = 0.05% then 10 year is just 10*0.05 = 0.5 |
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