# Highway Engineering Questions and Answers – Structural Evaluation of Flexible Pavements and Strengthening by Overlay – 3

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This set of Highway Engineering Questions and Answers for Campus interviews focuses on “Structural Evaluation of Flexible Pavements and Strengthening by Overlay – 3”.

1. The deflection value D is obtained from multiplying the difference of initial and final gauge difference of ___________
a) 1
b) 2
c) 3
d) 4

Explanation: The deflection value D is given by D=2(Do-Df).

2. The difference between initial and final deflection should not exceed ____ mm, for no leg correction value.
a) 0.02
b) 0.025
c) 0.050
d) 0.075

Explanation: The difference between the initial and final deflection should not exceed 0.025m or 2.5 division.

3. The statistical analysis of data doesn’t require ___________
a) Mean deflection
b) Standard deviation
c) Characteristics deflection
d) Settlement

Explanation: The statistical analysis of data requires mean deflection, characteristics deflection and standard deviation.

4. The characteristics deflection value is ___________
a) Dm+s
b) Dm-s
c) Dm-s
d) Dm/s

Explanation: The characteristics deflection is given by Dm+s, where Dm is the mean deflection and s is the standard deviation.

5. The sum of 15 deflections is 100, find the mean deflection.
a) 3.33
b) 4.44
c) 6.66
d) 1.5

Explanation: The deflection is given by 100/15=6.66, where 100 is the mean deflection and 15 is the number of observations.

6. The deflection correction will be negative if the temperature exceeds ___________
a) 30
b) 32
c) 35
d) 39

Explanation: In India the temperature is considered as 35°c for evaluation of pavement because India is a sub tropical and hot country.

7. The Overlay thickness depends on how many factors?
a) One
b) Two
c) Three
d) Four

Explanation: The overlay thickness depends on two major factors namely stability and CASA.

8. The VDF is assumed as 4.5 for commercial vehicle count of ___________
a) 1000
b) 1200
c) 1500
d) 2000

Explanation: The vehicle damage factor is assumed as 4.5, for commercial vehicle count of more than 1500.

9. The thickness of the flexible overlay is given by ___________
a) hd-he
b) hd+he
c) hd.he
d) hd/he

Explanation: The thickness of flexible overlay is given by hd-he, where hd is the thickness of the new design pavement and he is the existing pavement height.

10. The spacing between longitudinal joints may be ___________
a) 3.0 m
b) 3.2 m
c) 3.5 m
d) 4.0 m 