POKHARA UNIVERSITY
Level: Bachelor
Semester – Fall
Programme: Be
Course: Transportation Engineering I
Year
: 2009
Full Marks : 100
Time
: 3hrs.
Candidates are required to give their answers in their own words as far
as practicable.
The figures in the margin indicate full marks.
Attempt all the questions.
1. a.
b.
2. a.
b.
3. a.
b.
4. a.
b.
5. a.
b.
What are the different modes of transportation? Explain the role of
road transportation in rural development of Nepal.
Describe the different stages to be carried out for finalizing the
highway alignment.
7
What is sight distance? Derive the relation for the stopping sight
distance for a Speed of V KPH and ascending gradient of n%.
Calculate the length of transition curve and shift for the following
data:
Design speed =70KPH
Radius of Circular Curve=250m
Allowable rate of introduction of super elevation (pavement
rotated about inner edge) =1 in 140
Pavement width including extra widening= 7.5m.
7
What is Super elevation? Explain the method of attaining Super
elevation.
Calculate the maximum allowable speed on a horizontal curve if
maximum allowable value of lateral coefficient of friction is 0.15
and rate of super elevation is 0.07.
7
What are the special points to be considered in the aligning the hill
roads and why?
What is hair pin bend? Write down the design criteria adopted for
planning hair pin bends.
7
What are the requirements of highway drainage system? Explain
the design of filter material for subsurface drainage system.
The maximum quantity of water expected in one of the open
longitudinal drains on clayey soil is 0.8m3/sec. Design the cross
section and longitudinal slope of trapezoidal drain assuming the
7
1
8
8
8
8
8
bottom width of the trapezoidal section to be 0.8 m and cross slope
to be 1 vertical to 1.5 horizontal. The allowable velocity of flow in
the drain is 1.2 m/s and Manning’s roughness coefficient is 0.02.
6. a.
b.
Define the green road. Explain the objectives of green road
construction.
A specimen of asphaltic concrete has a height of 6.35 cm an
diameter 10.2 cm. The weights of compacted specimen in air and
water are 1180.5 gm and 678.6 gms respectively. The analysis of
the specimen yielded the following:
Material
Bulk
Specific
Gravity
Mix composition
(% by wt. of
mix)
Bitumen
1.02
6
Coarse Aggregate
2.6
54
55.3
Fine Aggregate
2.72
33.5
36.8
Mineral Filler
2.7
Total
7.
8
Aggregate
Composition( % by
wt. of total
aggregates)
6.5
7.9
100
100
Calculate
(i) Bulk density of specimen from dimension and immersion test
(ii)Air voids percentage in compacted mix
(iii) VMA
(iv) VFB
Write short notes on (Any Two)
a. Penetration test of bitumen
b. Abrasion value of aggregate
c. Marshall stability test
2
7
5×2