Highway Sheet 17

1) Question.

The minimum value of camber provided for thin bituminous surface hill roads, is
Answer.
- 1
  
  2.2%
- 2
  
  2.5%
- 3
  
  3.0%
- 4
  
  3.5%
Answer: 2

Explanation:
2) Question.

The usual width of side drains along Highways in hilly region, is
Answer.
- 1
  
  50 cm
- 2
  
  60 cm
- 3
  
  70 cm
- 4
  
  80 cm
Answer: 2

Explanation:
3) Question.

The usual width of parpet walls along Highways in hilly region, is
Answer.
- 1
  
  50 cm
- 2
  
  60 cm
- 3
  
  70 cm
- 4
  
  80 cm
Answer: 2

Explanation:
4) Question.

According to IRC:52-1973, for a single lane National Highway in hilly region,
Answer.
- 1
  
  width of the carriageway must be 3.75 m
- 2
  
  shoulders on either side must be 1.25 m
- 3
  
  total width of the road-way must be 6.25 m
- 4
  
  all of the above
Answer: 4

Explanation:
5) Question.

The wideth of the right of way, is influenced by
Answer.
- 1
  
  formation width
- 2
  
  shoulders or berms
- 3
  
  classification of road
- 4
  
  All the above
Answer: 4

Explanation:
6) Question.

An upgrade $g_{1} %$ is followed by a downgrade $g_{2} %$ . The equation of the parabolic curve of lenght L to be introduced, is given by
Answer.
- 1
  
  $g \frac{(g_{1} - g_{2})}{100 L} x^{2}$
- 2
  
  $y = \frac{(g_{1} + g_{2})}{200 L} x^{2}$
- 3
  
  $y = \frac{(g_{1} - g_{2})}{400 L} x^{2}$
- 4
  
  $y = \frac{(g_{2} + g_{1})}{800 L} x^{2}$
Answer: 2

Explanation:
7) Question.

The maximum distance of the apex of a vertical curve of length L from the point of intersection of two grades $+ g_{1} %, a n d - g_{2 %} (g_{1} > g_{2}),$ is
Answer.
- 1
  
  $\frac{L (g_{1} - g_{2})}{400}$
- 2
  
  $\frac{L (g_{1} - g_{2})}{800}$
- 3
  
  $\frac{L (g_{1} + g_{2})}{800}$
- 4
  
  $\frac{L (g_{2} - g_{1})}{300}$
Answer: 3

Explanation:
8) Question.

In an ideal transition curve, the radius of curvature
Answer.
- 1
  
  is constant
- 2
  
  at any piint is directly proportional to its distance from the point of commencement
- 3
  
  is inversely proportional to the radius of main curve
- 4
  
  is inversely proportional to the radius of main curve
Answer: 3

Explanation:
9) Question.

An ideal vertical curve is
Answer.
- 1
  
  true spiral
- 2
  
  cubic spiral
- 3
  
  cubic parabala
- 4
  
  none of these
Answer: 4

Explanation:
10) Question.

The radius of curvature provided along a transtion curve, is
Answer.
- 1
  
  minimum at the beginning
- 2
  
  same throughout its length
- 3
  
  equal to the radius of circular curve
- 4
  
  varying from infinity to the radius of circular curve
Answer: 4

Explanation:
11) Question.

In the Group Index method of flexible pavement design, which one of the following factors decides the thickness of base and surface course ?
Answer.
- 1
  
  percentage of sub-grade soil passing 75 micron sieve.
- 2
  
  type of surface and base course materials.
- 3
  
  daily volume of commercial vehicles.
- 4
  
  percentage of liquid limit of subgrade soil.
Answer: 3

Explanation:
12) Question.

While designing the superelevation of a highway, its maximum value is fixed considering the need to -
Answer.
- 1
  
  avoid toppling of slow moving vehicles in mixed traffic flow.
- 2
  
  avoid transverse skidding.
- 3
  
  provide drainage.
- 4
  
  counteract centrifugal force due to 75% of design speed.
Answer: 1

Explanation:
13) Question.

While aligning a hill road with a ruling gradient of 1 in 20, a horizontal curve of radius 80 m is encountered. The compensated gradient on the curve will be -
Answer.
- 1
  
  1 in 15
- 2
  
  1 in 17
- 3
  
  1 in 25
- 4
  
  1 in 27
Answer: 3

Explanation:
14) Question.

Which one of the following is associated with "Limiting Gradient" on highways ?
Answer.
- 1
  
  requirement of maximum tractive effort for a short distance.
- 2
  
  requirement of minimum tractive effort on the whole gradient.
- 3
  
  efficient drainage conditions.
- 4
  
  alignment design in general.
Answer: 1

Explanation:
15) Question.

In which one of the following types of bituminous constructions is proportioning of materials determined from laboratory tests ?
Answer.
- 1
  
  grouted macadam.
- 2
  
  premix carpet.
- 3
  
  bituminous or asphalt concrete.
- 4
  
  bituminous macadam.
Answer: 3

Explanation:
16) Question.

For sandy soils the most common method of stabilization is -
Answer.
- 1
  
  soil cement stabilization.
- 2
  
  mechanical stabilization.
- 3
  
  soil lime stabilization.
- 4
  
  soil bitumen stabilization.
Answer: 4

Explanation:
Sandy soils are generally stabilized with cement.

The amount of cement required to stabilize depends upon the quantity and quality of fines contained in sandy soils and final compacted density.

The cement required for sandy soils range between 5 and 12% by weight.

Stabilization of soil with cements consists of adding cement to pulverized soil and permitting the mixture to harden by hydration of cement.

The quantity of cement required for stabilization increases as soil plasticity increases.

Note:

Soil-lime stabilization: It is the process of adding lime to the soil to improve its properties like density, bearing capacity etc. The principle involved in lime-soil stabilization is the exchange of ions between lime and soil when added.

When clayey soil is treated with lime, cation exchange takes place between them which increases plastic limit and reduces plasticity index which finally results in increase in stability of soil. This method is used mostly for clayey flocculated soil.

Soil-bitumen stabilization: It is applied to highways and airfield construction. It is the method of designing and mixing local soil or aggregates with bituminous materials to form a stable and waterproof base course.

Bitumen stabilization is used for:-

a) For binding soil particles together for purpose of supplying cohesion for non-mechanical stabilized granular material.
17) Question.

Select the incorrect statement ?
Answer.
- 1
  
  emulsion is used for stabilizing desert sand.
- 2
  
  soil lime stabilization is very effective for stabilizing black cotton soils.
- 3
  
  soil lime stabilization is quite effective in warm regions.
- 4
  
  soil cement stabilization is quite durable for surface course.
Answer: 4

Explanation:
18) Question.

In hill roadds the side drains are provided -
Answer.
- 1
  
  only on the hill side of road.
- 2
  
  only on the opposite side of hill.
- 3
  
  on both sides of road.
- 4
  
  none of the above.
Answer: 1

Explanation:
19) Question.

The walls which are necessary on the hill side of roadway where earth has to be retained from slipping is known as -
Answer.
- 1
  
  retaining wall.
- 2
  
  breast wall.
- 3
  
  parapet wall.
- 4
  
  none of the above.
Answer: 2

Explanation:
20) Question.

In highway construction on superelevated curves, the rolling shall proceed from
Answer.
- 1
  
  sides towards the centre
- 2
  
  centre towards the sides
- 3
  
  lower edge towards the upper edge
- 4
  
  upper edge towards the lower edge
Answer: 3

Explanation:

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