Viva Questions for Transportation Engineering Lab

Sample Viva questions for Transportation Engineering Lab 1.

What do you mean by elongation index of an aggregate?

2.

What do you infer from elongation index?

3.

How the elongation index of the sample helps in deciding the design of a highway?

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What do you mean by flakiness index of an aggregate? What do you infer from flakiness index?

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How the flakiness index of the sample helps in deciding the design of a highway? How is aggregate Impact expressed? What do you understand by dry and wet Impact value? Aggregate Impact value of material A is 15 and that of B is 35. Which one is better for surface course? The abrasion value found from Los Angeles test for two aggregates A and B are 50% and 38% respectively. Which aggregate is harder? Why? For what types of constructions are these suitable? Why Los Angeles abrasion test is considered superior to the other form of tests which are used to determine the hardness of aggregates? Two materials have abrasion values 3 and 10 respectively. Which one is harder and why? How does the Water absorption of the coarse aggregate affects the mix design of concrete? Define flash and fire points. What is the significance of flash and fire point test? What are the parameter that affects the result of flash and fire point tests? Define specific gravity. What is the use of finding specific gravity? What are the factors affecting specific gravity test? What are the applications of penetration test? What do you understand by the term 30/40 bitumen? What are the precautions to be taken while conducting a penetration test? What are the factors which affect the ring and ball test results? What is softening point? If material A has softening point of 56 and B has 42 which binder is good and why? List the factors that affect the result of a ductility test. What do you understand by the term repeatability and reproducibility? Repeatabilityis the variability of the measurements obtained by one person while measuring the same item repeatedly. Reproducibilityis the variability of the measurement system caused by differences in operator behavior. Mathematically, it is the variability of the average values obtained by several operators while measuring the same item. Explain the significance of ductility test. Explain the term viscosity. What are the uses of viscosity test? What are the precautions to be taken during viscosity test using orifice viscometer? What is the significance of flow value in Marshall Test? What is filler? What are the essential properties of bituminous mixes? What are the lab tests on bitumen What is a. Ten percent fines b. Angularity number c. Marshall stability d. Flow value e. CBR f. OMC g. PHF h. PCU i. Desire line diagram

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37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. 53. 54. 55. 56. 57. 58. 59. 60. 61. 62. 63. 64. 65. 66. 67. 68. 69. 70. 71. 72. 73. 74.

j. Journey speed and running speed k. Time mean speed and space mean speed l. Capacity and LOS of road m. AADT n. ASTM o. Midblock p. MORTH / MORD specifications Explain the significance and test specifications of a. Abrasion test b. Softening point test c. Penetration test d. Crushing test e. Shape test f. Ductility test g. Flash n fire point test h. Specific gravity test i. Impact test j. Viscocity test k. Ductility test What is pouring temperature What is material characterisation What is traffic characterisation th th th What is the significance of 85 , 98 and 15 percentile speed What are the objectives of traffic surveys What are the different methods of conducting (a) volume studies, (b) speed studies, (c) Origin – destination studies, (d) speed and delay studies. Explain how the data in the above studies is presented What are the basic traffic characteristics. Define. Draw the relations between them What is the difference between short term and long term counts What is cordon line and screen line What is turning movement survey List the PCU factors for different vehicles On what factors PCU factors change What are the different types of pavements What are the different layers in pavement. Explain significance of each layer What is cutback and emulsion What are modified binders What are the different types of cutbacks and emulsions How are bitumen and tar manufactured What is difference between asphalt and bitumen What are the sources of aggregates What are the aggregates that are suitable for road construction What are the desirable properties of aggregate What are the permissible values of a. abrasion, b. water absorption, c. crushing, d. soundness What is the ideal specific gravity of aggregate, bitumen, cutback and emulsion How is the sample prepared in penetration, softening point, viscosity and ductility test Where do you use centrifugal extractor What is design mix Where do u have impact loads on roads What is the difference between coarse and fine aggregate Define volume, speed, headway and concentration What are the surveys to be proposed for a (1) new road construction, (2) widening of existing road, (3)geometric design of intersection What is the difference between structural design and geometric design of road What are the number of revolutions in centrifugal extractor and los angeles machine What is the difference between abrasion and attrition How do you measure attrition of aggregates What is angularity number What does 80/100 indicate What are the sources of bitumen

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Name some of road layers constructed with bitumen How is bitumen content expressed What is seal coat, tack coat and prime coat What are interface treatments What is the medium of heating in ring and ball test What is the relation between penetration value and softening point What grade of bitumen is recommended in road construction in hot climates and cold climates What are the test temperatures for penetration, softening , ductility test How much sample is required for conducting shape test What is combined FI and EI In which compounds, bitumen is soluble what is the significance of OMC and MDD what are the tests on aggregate to check the physical properties and mechanical properties what does of CBR of 2% indicate how do u select a grading while conducting abrasion test what is quality control what are pre-construction quality control, during construction quality control and post – construction quality control what is the advantage of moving car method in which survey, volume and speed are simultaneously obtained?