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21. If a two-lane National Highway and a two-lane State Highway intersect at right angles, the number of potential conflict points at the intersection, assuming that both the roads are two-way is ____. |
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A. 11 |
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B. 14 |
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C. 24 |
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D. 32 |
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Answer: C 24 |
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Explanation: On a right angled road intersection with two way traffic there are – 16 crossing conflicts which are the major conflict points, 4 merging and diverging conflicts which are the minor conflicts Hence, the total number of conflict points are 24. |
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22. The penetration value of a bitumen sample tested at 25°C is 80. When this sample is heated to 60°C and tested again, the needle of the penetration test apparatus penetrates the bitumen sample by d mm. The value of d can’t be less than ___ mm. |
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A. 5 |
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B. 8 |
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C. 10 |
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D. 20 |
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Answer: B 8 |
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23. A combined value of flakiness and elongation index is to be determined for a sample of aggregates. The sequence in which the two tests are conducted is ____. |
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A. elongation index test followed by flakiness index test on non-elongated aggregates |
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B. elongation index test followed by flakiness index test on the whole sample |
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C. flakiness index test followed by elongation index test on the whole sample |
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D. flakiness index test followed by elongation index test on non-flaky aggregates |
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Answer: D flakiness index test followed by elongation index test on non-flaky aggregates |
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24. Aggregate impact value indicates ____ property of aggregates. |
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A. Durability |
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B. Hardness |
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C. Strength |
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D. Toughness |
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Answer: D Toughness |
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25. In Marshall testing of bituminous mixes, as the bitumen content increases the flow value _____. |
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A. increases monotonically |
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B. increases first and then decreases |
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C. decreases first and then increases |
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D. remains constant |
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Answer: A increases monotonically |