This set of Civil Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Detailed Specifications of Road Work-1”.
1. Thickness of a pavement may be reduced considerably by ________
a) Drainage of soil
b) Stabilisation of soil
c) Compaction of soil
d) Drainage of soil, Stabilisation of soil and Compaction of soil
Explanation: The major factors which governs the thickness of the pavement are ‘Traffic’ and ‘subgrade soil strength’ apart from climatic conditions ( frost action etc.), material characteristics etc.
However, there were no options related to the above discussed.
Option (Drainage of soil) affects the thickness because the subgrade soil strength (measured in CBR (%)) changes with the density of the soil.
Option (Stabilisation of soil) also affects the thickness because the stabilized soils do possess higher soil strength/desired properties than the unstabilized.
Option (Compaction of soil) deals with the drainage of the soils. Drainage affects the performance of the pavement. If the pavement results in a poor performance under drainage condition, an additional “drainage layer” should be provided (IRC 37:2012) and also while strengthening the roads, it is expected to get more characteristic deflection results in providing more thickness than the properly drained pavement.
2. The usual width of parapet walls along Highways in hilly region, is ____________
a) 60 cm
b) 20 cm
c) 70 cm
d) 40 cm
Explanation: A parapet is a barrier which is an extension of the wall at the edge of a roof, terrace, balcony, walkway or other structure. The word comes ultimately from the Italian parapetto. The German equivalent Brustwehr has the same meaning. Where extending above a roof, a parapet may simply be the portion of an exterior wall that continues above the line of the roof surface, or may be a continuation of a vertical feature beneath the roof such as a fire wall or party wall.
3. The road foundation for modern highways construction, was developed by ____________
d) Telford and Macadam simultaneously.
Explanation: Thomas Telford, born in Dumfriesshire Scotland, was a surveyor and engineer who applied Tresaguet’s road building theories. In 1801 Telford worked for the British Commission of Highlands Roads and Bridges. He became director of the Holyhead Road Commission between 1815 and 1830. Telford extended Tresaguet’s theories, but emphasized high-quality stone. He recognized that some of the road problems of the French could be avoided by using cubical stone blocks.
John Loudon McAdam was born in Ayr, Scotland in 1756. In 1787 he became a trustee of the Ayrshire Turnpike in the Scottish Lowlands and during the next seven years this hobby became an obsession. He moved to Bristol, England in 1802 and became a Commissioner for Paving in 1806. On 15 January 1816 he was elected Surveyor-General of roads for the Turnpike Trust, and was now responsible for 149 miles of road. McAdam first put his ideas about road construction into major practice, the first ‘macadamised’ stretch of road being Marsh Road at Ashton Gate, Bristol.
4. In water bound macadam roads, binding material, is __________
a) stone dust
c) brick dust
Explanation: Stone dust is like a darker, coarser version of sand. It is a byproduct of running stones through a crushing machine to make crushed stone. Its exact composition will obviously depend on what kind of stone was run through the machine. For instance, sometimes granite is run through such a machine; in other cases, it could be limestone, for example. The machine has a screen that traps the larger material (that is, the crushed stone). The smaller material or “screenings” falls through the screen. Depending on the size of the holes in the screen used, it can be so fine in texture that it is basically a powder.
5. The distance travelled by revolving the wheel of a vehicle more than its circumferential movement, is known as __________
c) slip and skid
Explanation: An automobile skid is an automobile handling condition where one or more tires are slipping relative to the road, and the overall handling of the vehicle has been affected.
In (automotive) vehicle dynamics, slip is the relative motion between a tire and the road surface it is moving on. This slip can be generated either by the tire’s rotational speed being greater or less than the free-rolling speed (usually described as percent slip), or by the tire’s plane of rotation being at an angle to its direction of motion.
6. The type of transition curves generally provided on hill roads, is ________
b) cubic parabola
Explanation: In case of transition curves, if traffic condition is mixed then provision of speed is limited to 60% of max. Speed of vehicle. One side of curve will higher then the other side for the case of accident of traffic.
Ideal Transition curve: Spiral or clothoid (Lemniscate for modern roads).
Valley curve: Cubic parabola.
Vertical curve: Parabola.
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