Highway Engineering

281. The ratio of maximum deviation angle and maximum polar deflection angle of a Lemniscate curve, is

1. 2
2. 3
3. 4
4. 5

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282. The recommended grade of tar for grouting purpose is

1. RT-1
2. RT-2
3. RT-3
4. RT-5

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283. The road foundation for modern highways construction, was developed by

1. Tresguet
2. Telford
3. Tresguet and Telford simultaneously
4. Telford and Macadam simultaneously

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284. The safe length L of a valley curve for night travel is

1. 2S - (1.50 + 0.035 S)/N if L < S
2. NS²/(1.50 + 0.035 S) if L > S
3. Neither (a) nor (b)
4. Both (a) and (b)

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285. The safe stopping sight distance D, may be computed from the equation

1. D = 0.278 Vt + V²/254f
2. D = 0.254 Vt + V²/278f
3. D = 0.254 Vt + V²/225f
4. D = 0.225 Vt + V²/254f

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286. The shape of a vertical curve, is

1. Parabolic
2. Elliptical
3. Circular
4. Spiral

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287. The standard equation of a cubic parabolic transition curve provided on roads, is

1. y = x³/6 RL
2. y = x/6 RL
3. y = l²/6 RL
4. y = l³/6 RL

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288. The standard equation of a cubical spiral transition curve provided on roads, is

1. y = l²/6RL
2. y = x³/6RL
3. y = x²/6RL
4. y = x/6RL

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289. The statement, regarding the size of stones used at the wearing surface. "The size of a stone used on a road must be in due proportion to the space occupied by a wheel of ordinary dimensions on a smooth level surface. The point of contact will be found to be longitudinal about 2.5 cm and every piece of stone put into the road which exceeds 2.5 cm in any of its dimension is mischievous" was made by

1. Telford
2. Macadam
3. Tresguet
4. Sully

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290. The steepest gradient permitted on roads which, in ordinary conditions, does not exceed, is known

1. Ruling gradient
2. Maximum gradient
3. Exceptional gradient
4. Floating gradient

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