highway engineering
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The document discusses various topics related to highway engineering such as: 1. It defines key terms like the central road fund, National Highway Act of 1956, and the Central Road Research Institute. 2. It discusses classifications of roads under the Nagpur plan and modified classifications under the Third Road Development Plan. 3. It covers highway geometric design elements like carriageway width, camber, super elevation, horizontal and vertical curves.
highway engineering
- 1. CE 1255 Highway Engineering 1. Define central road fund? On the recornmendation of Jayhawker committee, central Road fund came into existence on 1st march 1929, Upon the authority of a resolution adopted by the Indian legislature. 2. Define National Highway Act 1956? In 1956, National Highway act was passed declaring the National Highways and empowering the central Govt to declare any other highway to be NH. This act came into force with effect from 15th April 1957. m 3. Explain CRRI? CRRI- The central Road Research Institute Delhi in 1950 co It is an organ of the council of scientific and industrial research, and in function include. 4. Write Short notes on Highway Research Board? N. This board was set up by I.R.C in 1973 to give proper direction and guidance to road research work in India. 5. What are classified roads in Nagpur plan? 1. National Highways (NH) va 2. State Highways (SH) 3. District Roads: (1) Major district Roads na (2) Other district Roads 4. Village roads. 6. Define Express ways? aa These roads are of higher, day than National highway. There are Such roads on which only font moving vehicles like car and jeeps are classified. 7. What are the modified classification of Road system by Third M RDP (1981-2001) 1. Primary System 2. Secondary System 3. Tertiary system 8. What are type of Road patterns? 1. Rectangular (or) Black pattern. 2. Radial (or) Star and black pattern. 9. Write short notes or Nagpur plan (or) Its 20-year Road plan. The first attempt for proper Scientific planning of roads in India, Wan made in chief Engineers conference held at Nagpur in 1943.
- 2. Nagpur conference finalized at 20 years (1943-1963) road development plan. 10. Write short notes on Second twenty year road plan (1961-81) A Second road development programmer (1961-81) was finalized by the chief engineers connected with road development, both at centre and Staten in a meeting held at Hyde Chad in 1959. 11. What are the fundamental principles of alignment? 1. Length of road should be shortest 2. The Proposed road should form a most economical line. 3. The alignment should provide corny. 12. What are the function which control the selection of alignment? m 1. Volume and type of traffic 2. Obligatory points co 3. Canal river (or) railway crossings 4. Geotechnical standard to he adopted 13. Define obligatory point? highway alignment. N. Obligatory point are such points which act to control points in 14.What are special considerations for him road alignment? 1. Stability 2. Drainage 3. Geometric standard 4. Deep writing va and heavy fillings should he avoided. 15.What are the varies type of Engineering surveys? 1. Map shady na 2. Reconnaissance survey 3. Preliminary survey 4. Detailed Survey aa 16.What are two type of road project? 1. A new highway Project 2. Re-alignment (or) revenging Highway project 17.What are head involved in Highway Geometric? M 1. Cross Section eleventh like camber, Super elevation 2. Sight distance character sight like stopping sight distance, overtaking sight distance etc. 3. Honzontal and vertical alignments 18.Define camber? Traverse slope given to the road surface in called camber. It is provided mainly to drain off rain water from the road surface. 19.What are the factors deepens on camber? 1. Account of Surface 2. Type ground surface
- 3. 20.What camber recommended in WBM Road? Water Bound Macadam road 1 to 33 (3%) 1 in 40 (2.5%). 21. What camber recommended in bihiminour road? Bihiminour surface 1 in 40 (2.5%) 1 in 50 (2%) 22. What camber recommended in cement concrete Road? Cement concrete Road 1 in 50 (2%) 1 in 60 (1.7%) 23. What are the different type of camber? 1. parabolic camber 2. Sloped camber 3. Composite camber m 24. Define carriage way width? Metal led puce strip of road meant for vehicular traffic co movement in called carriage way. 25. Define dual carriageways? Each portion of the carriageway is reserved for traffic moving in N. opposite direction. Such carriage ways are called dual carriageways. 26. What are the width of carriage way in meteor two lane without raised wert state highways? State highways 7.0 m va 27. Write note on high speed barrier herb? This herb is 23cm to 45cm to height . This herb is mainly used at initial location such as bridge and hill roads. na 28. Define formation width? Formation width is also called road way. It is the sum of width of carriage way shoulders, and separations it provided aa 29. Define Right of way:- Area to the acquired along the road alignment in called right of way. 30. Define sight distance? M Sight distance in the actual length of road over which a driver sitting at a specified height in a vehicle can see objects either moving (or) stationary on the road surface. 31. What are classification of sight distance depending upon the situation? 1. Stopping sight distance 2. Sate overtaking sight distance 3. Sight distance at intersection 32. Define S.S. D?
- 4. Stopping sight distance is the minimum distance required with in which a vehicle moving at designed speed can be stopped without colliding with a stationary object on the road surface. 33. What is the height of driver eye above the road surface? IRC recommended height of driver eye is 1.22m. 34. Define reaction time:- It is the time in seconds which a driver can take from the instant the objects visible to him to the instant the brakes are effectively applied. 35. Define perception period? Perception period is the time taken by an average driver to m realize a danger a head before actually trying to apply the breaker. 36. Define overtaking sight distance (OSD) co The distance visible to the driver of a vehicle intending to overtake another slow moving vehicle, without causing any inconvenience (or) possibility of accident to the traffic in the opposite distance. 37. Define design speed? N. direction in called overtaking sight distance (or) safe passing sight Design speed can be defined as the speed which is permissible va for safe and comfortable driving on a given surface of the highway. 38. What are the two effects of centrifugal force? 1. Tendency to overturn the vehicle. na 2. Tendency to skid the vehicle laterally. 39. Define super elevation? The outer edge of the road in raised above the inner edge aa called super elevation (or) cant (or) banking. 40. What is the elation between super elevation, continuant of friction and centrifugal force elf = v2 M ____ 127R e = super elevation whose value is taken an 40 (or) 1/15 f = Lateral frictional coefficient whose value in R = Radian of curve in metros . g = 9.8 V = speed of vehicle in m/sec.
- 5. 41. What is the maximum rules of super elevation ? v2 e = ---- 225R This formula assumer that centrifugal force corresponding to 75% of the designed speed is balanced by super elevation and the next winter acted by the side friction. 42. Define horizontal curve? It is a curve in plan to provide change in the direction of the central time by the road surface. m 43. What are the factors attesting the design of curve? 1. Design speed of the vehicle co 2. Allowable friction 3. Maximum allowable super elevation. 4. Permissible centrifugal ration. 44. Define vertical curve? N. It is a curve in the longitudinal section of a highway to provide a easy change of the gradient. 45. What are curve used in a highway. va 1. Circular curve 2. Transition curve 3. Parabolic curve na 46. What is the value of radian of the simple curve? R= 1720m app 47. Define compound curve? aa A compound curve currish of a serial of hoot (or) more simple curve that run in the same direction and joint at common tangent point. 48.Define Reverse curve? M A reverse curve consist of two simple curve opposite direction that point at the common tangent point. This common point in called the point of reverse curve 49. What are the types of transition curve? 1. True spiral (or clothed. 2. cubic spiral. 3. cubic parabolic. 4. Lemniscate’s. 50. What are characteristics of Transition curve? 1. It should meet the straight path tangentially
- 6. 2. It should meet the circular curve tangentially 51. What is the equation of a spiral transition curve? Ls = m √ Q Where m = √2RL = a constant Q = tangent of deflection angle in radians 52. How many methods to determine the length of transition curve? (1) By the rate of charge of radial acceleration (2) By empirical formula 53 . Define gradient? It is the rate of rise (or) fall of road level along if length 54. What are the factors governs the gradient? m (1) characteristics – of the traffic. (2) Physical factors of the site such a drainage, safety, co (3) Bridge, approach Road and railway Line intersection etc. 55. What are different types of gradient? 1. Maximum gradient 2. Puling gradient 3. Limiting gradient 4. Exceptional gradient N. 56. What are the driaclvantager of Exceptional gradient? va 1. More fuel consumption 2. More friction losses 3. Efficiency of engine reducer na 4. Early fatigue to animals. 57. What are the hyper of vertical curve? 1. Summit curve aa 2. Valley curve 58. what is the minimum Radian of vertical curve? The minimum ration of the curve is given by M L R = --- Q 59. What is the length of valley curve? L= 0.38 (NV 3) ½ L = Total Length of valley curve N = Deviation angle v = Design speed in triumph 60.What are the materials required for W.B.M roads? 1. Coarse aqqregate. 2. Screenings.
- 7. 3. Filler materials 61. What are type of bituminous road? 1. Surface dressing 2. Bituminous bound macadam 62. Define seal coat? Premised snail bitumen (or) surface dressing type seal coat is applied either immediately (or) after a few days. 63. What are method adopted consummation of cement concrete pavement? 1. Cement grout method 2. Rolled concrete method. m 3. cement connate slab method 64. What types of join provided in cement concrete pavements? co 1. Expansion joint 2. Contraction joint 3. warping joint. 1. Soft wood 2. Impregnated fiber board N. 65. What material used as joint Filler? 3. Cork (or) cork bound with bitumen va 4. Coir fiber 66. What mate rich used an joint sealer? 1. Birdmen na 2. Rubén bitumen 67. Write short notes on Hair pin bend? A hair pin bend should he located on the hill side aa having the minimum slope and maximum stability It should be sate against land slide and ground water. Hair pin bends with long arms and further spacing should he provided. 68. What are the methods of pavement? M 1. Flexible pavement 2. Rigid pavement 69. what are the component of a fallible pavement? 1, Soil sub grade 2. sub base course 3. Base course 4. Wearing course 70. Define sub grade? The soil sub grade in a layer of natural soil prepared to receive the other lays of the pavement.
- 8. 71. What properties posses soil sub grade? a, strength b, Drainage c. Ease of compaction d, permanency of compaction etc. 72.. What are tests conducted the strength properties of the sub grade? 1. California bearing ratio tests 2. California resistance value test 3. Plate bearing test 4. Trysail shear test m 73. Define bone course? It is the foundation layer, designed for the structural stability co The main function of the bare course in edible pavements is to improve the load supporting capacity by distributing the load through a finite ethicalness’. 74. Define leaving course ? N. It is that component of pavement with which the wheels of vehicular are in archival contain. 75. What are the factors attaching stability of pavement? va a. Traffic factors. b. Mosher factors. c. Climatic factors. na d. Soil factors e. Stets dissipation factors. 76. Define contact presume? aa Contact presume = loud on wheel ____________ contact area 77. Define Rigidity factor? M Rigidity factor = contact presume _____________ Type presume 78. What is ESUL? Equivalent Single Used Load 79. What understand by Repetition of load? The repeated loading may produce permanent and non uniform deformation of sub grade. 80. What are the causes of increase in moisture?
- 9. 1. Percolation of surface water through Erath in the pavement surface. 2. Entry of water through edger of the pavement 3. Seepage 4. Capillary rise from high water table 81. What is meaning of frost heave? The terms frost heave return to rising up of the pavement portion. 82. What method is used for strengthening of flexible pavement? Benkelman Beam Reflection method. 83. What is the basic principle of Benkelman Beam deflection m method? The deflection method is based on the concept that pavement co section which have been conditioned by traffic elastically under a load. 84. What are the factor considered deformation under a given load? 1. sub grade soil type N. 2. Soil mousier content and its compaction 3. Thickness of pavement layers 4. Drainage conditions. va 85. What are factors causing stressor in slab? 1. used loads 2. cyclic changer in temperature na 3. Changes in moisture 4. Volumetric changer in bare course. 86. Define hand aggregator give example? aa Hand aggregator are used to resist crushing effect and adverse weather effect (ex) granite trap 87. What is the user of soft aggregator ? They can also be used in lower layer of good type of roads. Soft M aggregator are usable in low cost road. 88. What are the proportion of aggregator? 1. Strength 2.Hardness 3. Toughens 4. Sound ness 5, shape of aggregate 6. Bushmen adhesion properly 7. cementations 89. What are test for Road aggregator? 1. Abrasion test 2. Lost angler abrasion test 90. Define Elongation index?
- 10. This test is also suitable for aggregate of size greater than 6.3mm and is carried our in the same way a how been explained in flakiness index 91. What are the proportion of bihiminour material 1. consistency 2. Durability 92. What are test of bitumen? 1. Generation test 2. Ductility test 3. Solubility test 93. What are different grade of bitumen? m 30/40, 80/100 , 60/70 94. Define emulsion? co Emulsion is a combination of water bitumen and an emulsifying agent. 95. What are test for bitumen emulsion? 1. Sieve test 2. Mining test N. 96. What are general causer of pavement failure? 1. Faulty material of commotion va 2. Faulty construction and improper quality control during construction. 97. What are typical failover of flexible pavement? na 1. Shear failure 2. Longitudinal cracks. 98. What are typical failure of cement concrete pavements? aa 1. mud pumping 2. spelling of join 99. what are the classification of maintenance? 1. Routine maintenance (0r) repairs 2. Periodic maintenance M 3. Special repairs. 100. What are two methods of pavements evaluation? 1. Structural evaluation of pavement 2. Evaluation of pavement surface conditions.