Sample Viva questions for Transportation Engineering
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 85th, 98th and 15th 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
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