|
41. The unit for coefficient of subgrade modulus is ____. |
|
A. kN/m² |
|
B. kNm |
|
C. kN/m³ |
|
D. kN/m |
|
Answer: A kN/m³ |
|
42. California Bearing Ratio (CBR) ____. |
|
A. is a method of soil identification |
|
B. is a measure to indicate the relative strengths of paving materials |
|
C. is a measure of soil strength |
|
D. is a procedure for designing flexible pavements |
|
Answer: B is a measure to indicate the relative strengths of paving materials |
|
43. The position of base course in a flexible pavement is ____. |
|
A. below the sub-base |
|
B. over the sub-grade but below the sub-base |
|
C. over the wearing course when renewal of surface is needed |
|
D. over the sub-base |
|
Answer: D over the sub-base |
|
Explanation: The pavements which have low or negligible flexural strength and are rather flexible in their structural action under the loads are Flexible Pavements. A typical flexible pavement consists of four components: · Soil subgrade · Sub-Base course · Base course · Surface course |
|
44. The Modulus of Subgrade Reaction is evaluated from ____. |
|
A. CBR test |
|
B. direct shear test |
|
C. triaxial test |
|
D. plate bearing test |
|
Answer: D plate bearing test |
|
45. The load transfer to lower layers in flexible pavements is by ____. |
|
A. grain to grain contact |
|
B. consolidation of subgrade |
|
C. shear deformation |
|
D. bending action of layers |
|
Answer: A grain to grain contact |
|
Explanation: The flexible pavement layers transmit the vertical or compressive stress to the lower layers by grain to grain transfer through the points of contact in the granular structure. |