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?
4. What do you mean by flakiness index of an aggregate?
5. What do you infer from flakiness index?
6. How the flakiness index of the sample helps in deciding the design of a highway?
7. How is aggregate Impact expressed?
8. What do you understand by dry and wet Impact value?
9. Aggregate Impact value of material A is 15 and that of B is 35. Which one is better for surface course?
10. 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?
11. Why Los Angeles abrasion test is considered superior to the other form of tests which are used to determine the
hardness of aggregates?
12. Two materials have abrasion values 3 and 10 respectively. Which one is harder and why?
13. How does the Water absorption of the coarse aggregate affects the mix design of concrete?
14. Define flash and fire points.
15. What is the significance of flash and fire point test?
16. What are the parameter that affects the result of flash and fire point tests?
17. Define specific gravity.
18. What is the use of finding specific gravity?
19. What are the factors affecting specific gravity test?
20. What are the applications of penetration test?
21. What do you understand by the term 30/40 bitumen?
22. What are the precautions to be taken while conducting a penetration test?
23. What are the factors which affect the ring and ball test results?
24. What is softening point? If material A has softening point of 56 and B has 42 which binder is good and why?
25. List the factors that affect the result of a ductility test.
26. 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.
27. Explain the significance of ductility test.
28. Explain the term viscosity.
29. What are the uses of viscosity test?
30. What are the precautions to be taken during viscosity test using orifice viscometer?
31. What is the significance of flow value in Marshall Test?
32. What is filler?
33. What are the essential properties of bituminous mixes?
34. What are the lab tests on bitumen
35. 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
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
36. 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
37. What is pouring temperature
38. What is material characterisation
39. What is traffic characterisation
40. What is the significance of 85
th
, 98
th
and 15
th
percentile speed
41. What are the objectives of traffic surveys
42. 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
43. What are the basic traffic characteristics. Define. Draw the relations between them
44. What is the difference between short term and long term counts
45. What is cordon line and screen line
46. What is turning movement survey
47. List the PCU factors for different vehicles
48. On what factors PCU factors change
49. What are the different types of pavements
50. What are the different layers in pavement. Explain significance of each layer
51. What is cutback and emulsion
52. What are modified binders
53. What are the different types of cutbacks and emulsions
54. How are bitumen and tar manufactured
55. What is difference between asphalt and bitumen
56. What are the sources of aggregates
57. What are the aggregates that are suitable for road construction
58. What are the desirable properties of aggregate
59. What are the permissible values of a. abrasion, b. water absorption, c. crushing, d. soundness
60. What is the ideal specific gravity of aggregate, bitumen, cutback and emulsion
61. How is the sample prepared in penetration, softening point, viscosity and ductility test
62. Where do you use centrifugal extractor
63. What is design mix
64. Where do u have impact loads on roads
65. What is the difference between coarse and fine aggregate
66. Define volume, speed, headway and concentration
67. What are the surveys to be proposed for a (1) new road construction, (2) widening of existing road, (3)geometric
design of intersection
68. What is the difference between structural design and geometric design of road
69. What are the number of revolutions in centrifugal extractor and los angeles machine
70. What is the difference between abrasion and attrition
71. How do you measure attrition of aggregates
72. What is angularity number
73. What does 80/100 indicate
74. What are the sources of bitumen
75. Name some of road layers constructed with bitumen
76. How is bitumen content expressed
77. What is seal coat, tack coat and prime coat
78. What are interface treatments
79. What is the medium of heating in ring and ball test
80. What is the relation between penetration value and softening point
81. What grade of bitumen is recommended in road construction in hot climates and cold climates
82. What are the test temperatures for penetration, softening , ductility test
83. How much sample is required for conducting shape test
84. What is combined FI and EI
85. In which compounds, bitumen is soluble
86. what is the significance of OMC and MDD
87. what are the tests on aggregate to check the physical properties and mechanical properties
88. what does of CBR of 2% indicate
89. how do u select a grading while conducting abrasion test
90. what is quality control
91. what are pre-construction quality control, during construction quality control and post – construction quality control
92. what is the advantage of moving car method
93. in which survey, volume and speed are simultaneously obtained?