Highway Engineering

251. The maximum allowable Los Angeles abrasion value for high quality surface course is

1. 10 %
2. 20 %
3. 30 %
4. 45 %

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252. The maximum comfortable retardation applied to moving vehicles, is

1. 3.42 m/sec²
2. 4.42 m/sec²
3. 5.56 m/sec²
4. 7.80 m/sec²

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253. The maximum distance of the apex of a vertical curve of length L from the point of intersection of two grades + g₁%, and - g₂% (g₁ > g₂), is

1. L(g₁ - g₂)/400
2. L(g₁ - g₂)/800
3. L(g₁ - g₂)/800
4. L(g₂ - g₁)/300

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254. The maximum limit of water absorption for aggregate suitable for road construction is

1. 0.4 %
2. 0.6 %
3. 0.8 %
4. 1.0 %

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255. The maximum radial distance of a Lemniscate curve, having maximum polar angle a, is

1. 3 R sin α
2. 3 R sin²α
3. 3 R sin 2α
4. 3 R sin α/2

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256. The maximum safe speed on roads, depends on the

1. Type of road surface
2. Type of curves
3. Sight distance
4. All the above

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257. The maximum spacing of contraction joints in rigid pavements is

1. 2.5 m
2. 3.5 m
3. 4.5 m
4. 5.5 m

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258. The maximum thickness of expansion joint in rigid pavements is

1. 0
2. 25 mm
3. 50 mm
4. 100 mm

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259. The method of design of flexible pavement as recommended by IRC is

1. Group index method
2. CBR method
3. Westergaard method
4. Benkelman beam method

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260. The minimum cross fall of shoulders is kept

1. 0.5 %
2. 1.0 %
3. 1.5 %
4. 3 %

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