Transportation

Q. For a highway with design speed of 100 kmph, the safe overtaking sight distance is (assume acceleration as $0.53m/s^2$)

1. 300 m
2. 750 m
3. 320 m
4. 470 m

Q. Width of carriageway for a single lane is recommended to be

1. 7.5 m
2. 7.0 m
3. 3.75 m
4. 5.5 m

Q.

The speed of overtaking and overtaken vehicles on a highway are $85kmph$ and $70kmph$ respectively. Calculate the overtaking sight-distance needed for two way traffic. Assume the acceleration of the overtaking vehicle as $2.5kmph$ per second and the speed of the vehicle in the opposite direction as $85kmph$

1. 545.52

Q.

If the design speed is 80 kmph, perception reaction time 3 seconds and coefficient of friction is 0.5, the safe stopping sight distance is

1. 117.11

Q. The equilibrium cant required on a $5^{\circ }$ curve on a BG track for the train speed of 60 kmph is cm.

1. $14.81$
2. $13.81$
3. $15.23$
4. $16.32$

Q. When two roads with two-lane, two-way traffic, cross at an uncontrolled intersection, the total number of potential major conflict would be

1. 24
2. 16
3. 4
4. 32

Q. Bitumen grade 80/100 Indicates that under the standard test conditions, penetration value of bitumen would vary from

1. 0.08 mm to 0.1 mm
2. 8 cm to 10 cm
3. 0.8 mm to 1 mm
4. 8 mm to 10 mm

Q. The design speed for a National Highway is 100 kmph. If the maximum permissible superelevation is 0.10 and the coefficient of lateral friction is 0.15, the ruling minimum radius of horizontal curve on the highway should be

1. $260m$
2. $410m$
3. $380m$
4. $315m$

Q. The length of runway under standard conditions is 2000 m. The elevation of airport site is 300 m. Its reference temperature is 33.05${}^o$C. If the runway is to be constructed with an effective gradient of 0.25%, the corrected runway length will be _______m.

1. 2696.4

Q. The total thickness of pavement by CBR methods depends on the CBR value of

1. surface course
2. subgrade
3. base course
4. all layers

Q.

On one way traffic road, the speeds of overtaking and overtaken vehicles are 80 kmph and 50 kmph respectively. If the acceleration of the overtaking vehicle is 2.5 kmph per second, calculate the overtaking sight distance (Assume spacing between vehicles is 16 m, reaction time of driver is 2 seconds)

1. 191.05

Q. The plate load test conducted with a 75 cm diameter plate on soil subgrade yielded a deflection of 2.5 mm under a stress of 800 N/$c{m}^2$.

The modulus of elasticity of the subgrade soil, in kN/$c{m}^2$ is

1. 160.0
2. 141.6
3. 185.4
4. 154.6

Q.

Average free flow speed and the jam density observed on a road stretch are 60 km/h and 120 vehicles/ km, respectively. For a linear speed density relationship, the maximum flow on the road stretch (in vehicles/h) is

1. 1800

Q. The safe stopping distance for a design speed of 50 kmph for a two lane road with coefficient of friction of 0.37 in m is

1. 61.3
2. 81.7
3. 123.7
4. 161.6

Q. Assuming the safe stopping sight distance to be 80 m on a flat highway section and with a setback distance of 10 m, what would be the radius of the negotiable horizontal curve?

1. 160 m
2. 70 m
3. 80 m
4. 800 m

Q. Brake is applied on a vehicle which then skids a distance of 16 m before coming to stop. If the developed average coefficient of friction between the tires and the pavement is 0.4, then the speed of the vehicle before skidding have been nearly

Q. A valley curve has a descending gradient of 1 in 40 followed by an ascending gradient of 1 in 50. The length of the valley curve required for a design speed of 80 km/hour for comfort condition is

1. $37m$
2. $58m$
3. $116m$
4. $199m$

Q. The extra widening required for a two-lane National Highway at a horizontal curve of 300 m radius, considering a wheel base of 8 m and a design speed of 100 kmph is

1. 0.42 m
2. 0.62 m
3. 0.92 m
4. 0.82 m

Q. A BG main line curve of 2.76° and a 1:12 turnout takes out in contrary flexure for a branch line which has a design speed of 30 kmph. The permissible cant on the main line is considering inner to inner distance of the rail as gauge.

1. 56.8 mm
2. 65.2 mm
3. 61.2 mm
4. 88.8 mm

Q. The radius of relative stiffness of a rigid concrete pavement using the following data is ____ cm

(i) Modulus of elasticity of concrete$=3.0\times {10}^{5}kg/c{m}^2$
(ii) Thickness of pavement slab = 20 cm
(iii) Poisson's ratio = 0.15
(iv) Wheel load = 4100 kg
(v) Pressure applied to the plate load test at 1.25 mm displacement $=0.375kg/c{m}^2$

1. 81.28
2. 98.15
3. 104.5
4. 90.88

Q. A plate load test was conducted on a subgrade using a 30 cm diameter plate. If the load corresponding to a settlement of 1.25 mm and 2.5 mm is 1500 kg and 1000 kg, then the modulus of subgrade reaction for standard plate is ___$\left(\text{in}kg/c{m}^3\right)$

1. 6.78

Q. A $5^o$ curve diverges from a $3^o$ main curve in an opposite direction in the leg out of a B.G. yard. The speed on the branch line is restricted to $30kmph$. The speed on the main line will be ___$kmph$.
[Assume permissible cant deficiency as $76mm$]

1. 72.22

Q. The PCU (passenger car unit) value for car on an urban road is

1. $0.5$
2. $1.0$
3. $3.0$
4. $4.0$

Q. What will be the length of transition curve required on a horizontal curve of radius 500 m on a highway passing through rolling terrain for a design speed of 80 kmph? (Answer correct upto one decimal place)

Q. The value of absolute minimum radius of horizontal curve on a national highway in plain terrain will be _______ m.
[Consider minimum design speed as 80 kmph]

1. 202
2. 120
3. 265
4. 229

Q. The design speed on a road is 60 kmph. Assuming the driver reaction time of 2.5 seconds and coefficient of friction of pavement surface as 0.35, the required stopping distance for two-way traffic on a single lane road is

1. 82.1 m
2. 102.4 m
3. 164.2 m
4. 186.4 m

Q. The design value of lateral friction coefficient of highway is

1. $1.5$
2. $0.50$
3. $0.35$
4. $0.15$

Q. In a rigid pavement slab of 20 cm thickness, the equivalent radius of resisting section assuming the contact area as $707{cm}^2$ is _______(in cm)

Q. The extra widening required for a horizontal curve of radius 150 m and for vehicle having design speed of 80 kmph, length of wheel base as 6 m, width of pavement=7.5 m.

1. 0.24 m
2. 0.687 m
3. 1.11 m
4. 0.927 m

Q. For a road with camber of 3% and the design speed of 80 km/hr, the minimum radius of the curve beyond which NO superelevation is needed is

1. 1680 m
2. 948 m
3. 280 m
4. 406 m