This set of Highway Engineering Multiple Choice Questions & Answers focuses on “Factors Affecting Design and Performance of Flexible Pavements”.
1. The number of factors considered for flexible pavement is ______________
Explanation: The design factors that are considered are wheel load, soil, climate, pavement layer, drainage.
2. The contact pressure is given by _____________
Explanation: The contact pressure is given by P/A, where P is wheel load and A is area of contact.
3. The distribution of circular load was obtained by _____________
a) Wester guard
Explanation: The stress distribution for the circular load was obtained by Boussinesq, in which he assumed homegenous and elastic material.
4. What is the last step in the design of flexible pavement?
a) Design of sub grade
b) Design of base
c) Design of mix
d) Design of the pavement thickness
Explanation: The last step in the design of the pavement is design of pavement thickness, after design of mix, design of sub grade, sub base and base.
5. If one or more wheels act as a single load then it is called as _____________
Explanation: If one or more wheels act as a single load then it is called as an equivalent single wheel load.
6. The pressure in pneumatic tyres should not exceed _____________
Explanation: The maximum tyre pressure in pneumatic tyre is 9.5kg/cm2.
7. The revised legal load of HCV in India in tonnes is _____________
Explanation: The maximum legal load in India is considered after revision as 10.2 tonnes, before it was 8.17 tonnes only.
8. The legal load considered in the benklemen beam method is _____________
Explanation: The maximum legal load in benklemen beam method is considered as 8.17 tonnes or 8170 kg.
9.The load dispersion is assumed at an angle of _____________
Explanation: The angle of the dispersion is assumed as 45° in the ESWL for the ease of construction and calculation.
10. The equivalent wheel load factors are calculated by using _____________
a) First power law
b) Second power law
c) Third power law
d) Fourth power law
Explanation: The load factor follows the fourth power law for the calculation of VDF and load factor.
11. What is the standard wheel load in Ewl factor?
a) 4080 kg
b) 9160 kg
c) 8170 kg
d) 5100 kg
Explanation: The load is considered for only one wheel which is 4080kg, it is considered as the half of the legal load.
12. The rate of growth in traffic in urban areas is assumed as _____________
Explanation: The rate of growth in traffic for urban areas is assumed as 7.5%, it may also vary depending on the requirement.
13. The constant value used in the calculation of CSA is _____________
Explanation: Except the value of 365, all the other constant vary depending on the lane, vehicle and traffic.
14. The presence of moisture content causes _____________
c) Alternate swelling and shrinkage
Explanation: The presence of moisture content in any water absorbed soil causes the swelling of soil and ultimately gives rise to cracks.
15. Which frost heave is dangerous?
a) Unlike frost heave
b) Like frost heave
c) Uneven frost heave
d) Even frost heave
Explanation: The frost heave which is caused in cold temperatures raises the edges of the pavement, if they are uneven then it is very dangerous.
Sanfoundry Global Education & Learning Series – Highway Engineering.
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