Highway Enginee...

Which of the following are true?

Which of the following is not a desirable property of the subgrade soil as a highway material?

The steepest gradient on a 2° curve on a Broad Gauge line with a stipulated ruling gradient of 1 in 200, given that grade compensation is 0.04% per degree of curve, is

A descending gradient of 4% meets an ascending grade of in 40 where a valley curve of length 200 must to be formed. What will be the distance of the lowest point on the valley curve from its first tangent point?

The consistency and flow resistance of a sample of bitumen can be determinated through which of the following tests?

The speed-density relationship in a mid-block section of a highway follows the Greenshields’s model. If the free flow speed is v_f and the jam density is k_j , the maximum flow observed on this section is

What is the deflection at the surface of a flexible pavement due to a wheel load of 40 kN and a tyre pressure of 0.5 MPa? The value of E for pavement and subgrade is 20 MPa.

An engineer is designing a two-phase traffic signal system with an all-red time for pedestrian crossing as 15 s. If Webster’s method is used, then what will be the total lost time?

Three vehicle of speed 60 m/sec, 50 m/sec and 40 m/sec passing through the 10m length of road. The difference between the space mean speed and time mean speed of vehicles (absolute value) in km/hr is:

Three new roads A, B, and C are to be constructed in a district during a five-year plan period. Using the data given below, work out the decreasing order of priority for phasing the planned program by the principle of maximum utility per unit length. Adopt utility units of 0.5, 1.0 and 2.0 for the village with a population less than 2000, 2000 to 5000 and greater than 5000 respectively. Also, the utility unit is considered to be 1 for catering 1000 tones of agricultural products and 10 for 1000 tones of industrial products.

A sub grade soil sample was tested using standard CBR apparatus and the observations are given below.

A roundabout is provided with an average entry width of 8.5 m, width of weaving section is 14 m, length of the weaving section between channel island is 70 m. The crossing and Total traffic on the weaving section are 1000 and 2000 PCU per hour respectively.

Then which of the following are true.

While designing the flexible pavement if the design traffic (msa) in terms of cumulative number of standard axles for the annual growth rate of vehicles of 7% is 23 msa, then how much percentage increase in the design traffic in terms of cumulative number of standard axles as per IRC 37 : 2012 for the annual growth rate of vehicles of 10% if it is assumed that (initial traffic in the year of completion of construction in terms of the number of commercial vehicles per day is constant).

Taken Design life of pavement to be 12 years.

In a Marshall sample, Bulk specific gravity of the mix and Theoretical specific gravity aggregates are 2.324 and 2.546 respectively. The sample includes 5% of bitumen (by total weight of mix) of specific gravity 1.10.

A National Highway passes through a rolling terrain having a horizontal curve of radius 600 m, Design speed is 80 kmph, Total pavement width is 7.5 m, The number of lanes is 2, wheelbase is 6 m, allowable rate of superelevation 1 in 150 allowable rate of change of centrifugal acceleration, C = 0.507, Assume that the pavement is rotated about the outer edge. The total length of transition curve is

Match List – I (Tests on bitumen) with List-II (Purpose of conducting Test) and choose the correct option.

A student riding a bicycle on a 5 km one-way street takes 40 minutes to reach home. The student stopped for 15 minutes during this ride. 60 vehicles overtook the student (assume the number of vehicles overtaken by the student is zero) during the ride and 45 vehicles while the student stopped. The speed of vehicle stream on that road (in km/hr) is

Consider the following data with respect to the design of flexible pavement:

Design wheel load = 4200 kg

Tyre pressure = 6.0 kg/cm²

Elastic modulus = 150 kg/cm²

Permissible deflection = 0.25 cm

(take π^1/2 = 1.77, π^-1/2 = 0.564, \(\frac{1}{\pi } = 0.318,\) and π² = 9.87)

A 9-degree curve branches off from 8-degree main curve in an opposite direction in the layout of Meter Gauge yard. If the permissible speed on main line is 40 kmph. Calculate the speed restriction on branch line if the permissible cant deficiency is 50 mm.

Determine the actual runway length in m after applying correction for temperature & elevation

Basis runway length = 1800 m

Airport site elevation = 600 m

Monthly mean daily average temperage = 15°c

A signal is required to be installed at a North-South and East-West intersection. The following data is available:

Calculate the cycle length as per Webster’s approach (in seconds) for two-phase fixed type signal if only straight-ahead traffic is permitted. (Assume total time lost per cycle is 15 seconds)