141.A hill road is one which passes through a terrain with a cross slope of 25 to 60%
142. Fig. shows a longitudinal section AB of a hill road. The resisting length Lᵣ is
given by
where f is the coefficient of frictional resistance
Lᵣ = L₁ +h/f
143. In hill roads if several alternate alignments are surveyed which fulfill the geometric standards, then the preferred alignment is the one which has resisting length as minimum
144. The camber for hill roads in case of bituminous surfacing is adopted as 2.5%
145. The superelevation to be provided in horizontal curves of radius R in hill roads
is given by
where V is the speed in kmph
146.The minimum design speed for hairpin bends in hill roads is taken as
20 kmph
147. The drain which is provided parallel to roadway to intercept and divert the water from hill slopes is known as catchwater drain
148. The walls which are necessary on the hill side of roadway where earth has to be retained from slipping is known as breast wall
149. In hill roads the side drains arc provided only on the hill side of road
150.a) Emulsion is used for stabilizing desert sand.
b) Soil lime stabilization is very effective for stabilizing black cotton soils.
c) Soil lime stabilization is quite effective in warm regions
151. For sandy soils the most common method of stabilization is soil bitumen stabilization
152. In which one of the following types of bituminous constructions is proportioning of materials determined from laboratory tests?
Bituminous or asphalt concrete
153. A road camber is given in Fig.
154. Which one of the following is associated with "Limiting Gradient" on highways? Requirement of maximum tractive effort for a short distance
155. 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
1 in 25
156. While designing the superelevation of a highway, its maximum value is fixed
considering the need to avoid toppling of slow moving vehicles in mixed traffic flow
157. In the Group Index method of flexible pavement design, which one of the
following factors decides the thickness of base and surface course? daily volume of commercial vehicles
158. In a bituminous pavement, alligator cracking is mainly due to fatigue arising from repeated stress applications
159. The main function of prime coat is to provide bond between the existing
base and surfacing of new construction
160. The design of horizontal transition curve length for highways should take into
account three factors namely, allowable values of rate of change of centrifugal
acceleration and superelevation and the minimum length formula given by
the IRC
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