This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Flexible Pavement Design – Types”.
1. Which of the following is a classification of pavements?
a) Load pavement
b) Sub-grade pavement
c) Flexible pavement
d) Rigidity pavement
View Answer
Explanation: Pavements are classified in to Flexible, rigid and semi-flexible, based on distributing loads.
2. Pavements are classified, based on ________ factors.
a) Earth surface
b) Materials used
c) Rigidity of the pavement
d) Distributing loads
View Answer
Explanation: Depending upon the mode of supporting and distributing loads, pavements are classified in to Flexible, rigid and semi-flexible.
3. The thickness design of the flexible pavement is influenced by _________
a) Distributing load
b) Strength of sub-grade
c) Sub-base
d) Soil properties
View Answer
Explanation: The design of flexible pavement is based on the principal that a surface load is dissipated by carrying it deep in to the ground through the layer of sub-grade.
4. The essential difference between rigid flexible pavements is ___________
a) Distribution of load over sub-grade
b) Distribution of load over sub-base
c) Materials used
d) Thickness of layers
View Answer
Explanation: The essential difference between rigid flexible pavements is the manner in which they distribute the load over the sub-grade.
5. Rigid pavement are commonly made of ________
a) Bitumen
b) Portland cement concrete
c) Dry-lean concrete
d) None of the mentioned
View Answer
Explanation: Rigid pavements are made up of Portland cement concrete and may or may not have a base course between the pavement and the sub-grade.
6. Which of the following pavement is capable of resisting small tensile strength?
a) Semi-flexible pavement
b) Rigid pavement
c) Flexible pavement
d) All of the mentioned
View Answer
Explanation: A flexible pavement consists of relatively then wearing surface and hence, can resist only very small tensile strength then the other pavement.
7. The wearing surface of pavement are made of _________
a) Bituminous materials
b) Portland cement concrete
c) Dry-lean concrete
d) Other materials
View Answer
Explanation: The purpose of wearing course, made of bituminous materials is to provide a smooth riding surface that is re silent and to resist the pressure exerted by the tyres.
8. The stability of sub-grade in a pavement is influenced by __________
a) Compaction
b) water contact
c) Materials used
d) Rigidity
View Answer
Explanation: Stability of the sub-grade is influenced by soil texture, water content, density, frost action, shrinkage and swelling and other climatic factors.
9. In pavements ___________ forms the foundation layer.
a) Base course
b) Sub-base
c) Sub-grade
d) Wearing course
View Answer
Explanation: The sub-grade is the foundation layer, the structure which must eventually support all the loads which come on to the pavement.
10. Base course and sub-base course are used under flexible pavements for __________ purpose.
a) To provide foundation
b) To increase durability
c) To increase load supporting capacity
d) All of the mentioned
View Answer
Explanation: Base course and sub-base course are used under flexible pavements primarily to increase the load supporting capacity of the pavement by distributing the load through a finite thickness of pavement.
11. The flexible pavement-thickness consists of __________ components.
a) Two
b) Three
c) Four
d) Five
View Answer
Explanation: Generally, the flexible pavement-thickness consists of three components: surfacing, base and sub-base course.
12. Which of the following pavement can be used, for construction on black cotton soils?
a) Flexible pavement
b) Semi-flexible pavement
c) Rigid pavement
d) All of the mentioned
View Answer
Explanation: The rigid pavements are used for heavier loads and can be constructed over relatively poor sub-grade such as black cotton or plastic soils, peat etc.
13. Which of the following layer of pavement should withstand a high level of deformation?
a) Base course
b) Sub-base
c) Sub-grade
d) Surfacing course
View Answer
Explanation: The base course lies close to the pavement surface, and hence it must possess high resistance to deformation in order to withstand high pressure imposed on it.
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