highway engineering cross sectional elements geometric design pavement types materials tests - One Line Questions

1. What is the minimum width of a single lane carriageway on an NH in plain terrain? — 3.75 m
2. The maximum design speed for a national highway in plain terrain, as per IRC standards, is typically: — 120 km/h
3. The 'Bitumen Emulsion' is a mixture of: — Bitumen, water, and an emulsifying agent
4. The 'California Bearing Ratio (CBR)' test is primarily used to assess the strength of: — Subgrade soil
5. In a rigid pavement, the primary structural component is the: — Cement Concrete slab
6. Which of the following is NOT considered a cross-sectional element of a highway? — Gradient
7. Which material is typically used as the surface course in a flexible pavement? — Bituminous Concrete
8. Which type of vertical curve is used to connect two descending grades? — Valley Curve
9. Which test is performed to determine the hardness of aggregates used in highway construction? — Hardness Test (Mohs scale is not standard for aggregates)
10. Which parameter is NOT directly considered in the calculation of Stopping Sight Distance (SSD)? — Gradient of the road (for uphill, it reduces SSD, for downhill it increases SSD, but the basic formula uses it)
11. What is the minimum stopping sight distance (SSD) dependent on? — Design speed and reaction time
12. The 'Rate of Change of Superelevation' is important for: — Preventing discomfort to passengers and ensuring smooth transition
13. For a summit vertical curve, the sight distance required is generally: — Equal to Stopping Sight Distance (SSD)
14. For a sag vertical curve, the sight distance required is generally: — Equal to Stopping Sight Distance (SSD)
15. Which type of pavement is characterized by a concrete slab acting as a continuous bridge over the subgrade? — Rigid Pavement
16. The minimum radius of a horizontal curve is determined by the maximum allowable value of which parameter? — Superelevation
17. Which geometric design element is crucial for ensuring safe and comfortable negotiation of curves? — Superelevation
18. The minimum stopping sight distance (SSD) is influenced by the coefficient of friction between the tires and the pavement surface and the: — Reaction time of the driver
19. The 'Los Angeles Abrasion Test' is used to evaluate the: — Resistance of aggregates to wear
20. What is the main advantage of flexible pavements over rigid pavements? — Lower initial cost and adaptability to stages of development
21. The 'Rate of Change of Grade' is a critical parameter for the design of: — Vertical Curves
22. What is 'Mechanical Widening' of a horizontal curve? — Increasing the pavement width due to the slow-moving vehicle's larger turning radius
23. What does the 'Penetration Value' of bitumen indicate? — Its consistency or hardness
24. The 'Stripping Value' test for bitumen is conducted to assess: — Its resistance to stripping by water
25. The 'Softening Point' test for bitumen is used to determine: — The temperature at which it softens and begins to flow
26. Which test is used to measure the resistance of aggregates to breaking down under gradual impact? — Aggregate Impact Value Test
27. The rate of superelevation is limited by: — All of the above
28. Which of the following is a characteristic of a 'Composite Pavement'? — A combination of cement concrete and bituminous layers
29. Which test is used to determine the resistance of bitumen to flow at elevated temperatures? — Softening Point Test
30. Which of the following is a factor influencing the design of a vertical curve? — Rate of change of grade
31. The 'Ductility Test' for bitumen measures its ability to: — Stretch without breaking
32. The 'Aggregate Crushing Value' test determines the: — Resistance of aggregate to crushing under gradually applied load
33. The 'Impact Value' test on aggregates measures their: — Resistance to sudden shock or blow
34. Which type of pavement consists of a granular base and sub-base layers topped with a bituminous surface? — Flexible Pavement
35. Which test is used to determine the resistance of aggregates to disintegration by the action of weather? — Soundness Test
36. What is the recommended minimum sight distance for a crest vertical curve on a national highway in India? — Stopping Sight Distance (SSD)
37. The minimum length of a horizontal curve is determined by: — Superelevation requirements and mechanical widening
38. Which component of a flexible pavement directly receives the wheel load from the tires? — Surface Course
39. The purpose of providing a 'Gutter' along the edge of a highway is to: — Collect and channel surface water away from the pavement
40. What is 'Retained Strength' in the context of bitumen-aggregate mixtures? — The strength of the mixture after exposure to water, expressed as a percentage of its original strength
41. The 'Gradient' on a highway refers to: — The rate of rise or fall of the road surface
42. The 'Flakiness Index' of aggregates indicates: — The proportion of flaky particles in the sample
43. What is the purpose of a 'Median Opening' on a divided highway? — To facilitate U-turns and other turning movements
44. What is the purpose of 'Sight Distance' in highway design? — To provide a clear view of the road ahead for safe driving
45. What is the primary function of the 'Binder Course' in a flexible pavement? — To bind the surface course and the base course together
46. What is the primary function of shoulders on a highway? — To accommodate stopped vehicles and provide lateral support to the pavement
47. What is the primary purpose of camber in a highway pavement? — To facilitate drainage of surface water
48. What is the primary function of a 'Kerb' or 'Curb' on a highway? — To demarcate the edge of the carriageway and protect the pavement edge
49. What is the purpose of the 'Subgrade' in a pavement structure? — To distribute wheel loads to the underlying soil
50. What is the main function of a median in highway design? — To separate opposing traffic streams
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