This set of Highway Engineering Multiple Choice Questions & Answers (MCQs) focuses on ” Sub Surface Drainage”.
1. In slab culverts RCC slab is placed over abudment of __________
a) Masonry
b) Pre stressed
c) Steel
d) Composite
View Answer
Explanation: Generally the RCC slab is placed over abudment made of masonry only because other materials are costly.
2. The span of RCC slab is limited to __________
a) 1 m
b) 1.5 m
c) 2.0 m
d) 3.0 m
View Answer
Explanation: The span of the RCC slab is usually limited to 3 m as it may have maintenance problems.
3. What is the minimum diameter used in pipe culverts?
a) 25 cm
b) 35 cm
c) 45 cm
d) 75 cm
View Answer
Explanation: The minimum diameter of the pipe culverts used is 75 cm made of steel or RCC, usually RCC is only used as steel corrodes.
4. The GWT should be at a distance of _______ from ground level.
a) 0.5 m
b) 0.6 m
c) 1.2 m
d) 5.0 m
View Answer
Explanation: The preferred distance from the ground level is 1.2m, however it is not a problem where ground water table is very low.
5. The total interruption to traffic in a year should not exceed __________
a) 45 days
b) 40 days
c) 30 days
d) 15 days
View Answer
Explanation: The interruption should be kept as low as possible if unavoidable then we must provide it for 15 days.
6. The clay seal may be provided if the seepage zone is at a depth of less than __________
a) 1.2 m
b) 1.0 m
c) 0.9 m
d) 0.6m to 0.9 m
View Answer
Explanation: The clay seal may be construed if the seepage zone is at a depth of less than 0.6 m to 0.9 m.
7. The capillary control can be controlled by how many methods?
a) One
b) Two
c) Three
d) Four
View Answer
Explanation: The capillary control can be controlled by two methods called granular capillary cut off and impermeable capillary cut off.
8. To fulfill the adequate permeability the D15 of filter/D15 of foundation ratio should be greater than __________
a) 5
b) 10
c) 15
d) 20
View Answer
Explanation: For adequate permeability, the ratio of the D15 of filter/D15 of foundation should be greater than 5.
9. The D85 point size is given by __________
a) Dp
b) 2Dp
c) 3Dp
d) 4Dp
View Answer
Explanation: The D85 point size of the filter is given by the value 2Dp.
10. The loss of water from leaves present on embankment is called __________
a) Evaporation
b) Transpiration
c) Sublimation
d) Boiling
View Answer
Explanation: The vegetation is provided on the embankment as they can absorb the water during heavy rain, and the loss is termed as transpiration.
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