Civil Engineering - Transportation Engineering
Exam Duration: 45 Mins Total Questions : 30
The design speed for a two lane road is 80 km/h. When a design vehicle with a wheel base of 6.6 m is negotiating a horizontal curve on the road, the off tracking is measured as 0.96 m.The required widening of carriage-way of the two lane road on the curve is approximately.
- (a)
0.55 m
- (b)
0.65 m
- (c)
0.75 m
- (d)
0.85 m
The psychological widening as per IRC guidelines varies with
- (a)
\(\frac { { v }^{ 2 } }{ \sqrt { R } } \)
- (b)
\(\frac { { v }^{ 2 } }{ R } \)
- (c)
\(\frac { v }{ R } \)
- (d)
\(\frac { v }{ \sqrt { R } } \)
A horizontal curve of 480 m radius for 7.5 m two lane road is to be designed for a speed of 80 km/h.The raising of the outer edge of pavement with respect to the centre line to cater the mixed traffic condition is
- (a)
0.14 m
- (b)
0.22 m
- (c)
0.24 m
- (d)
0.44 m
The maximum design gradient for vertical profile of a rod is
- (a)
ruling gradient
- (b)
limiting gradient
- (c)
exceptional gradient
- (d)
minimum gradient
Which of the following tests measures the toughness of road aggregates?
- (a)
Crushing strength test
- (b)
Abrasion test
- (c)
Impact test
- (d)
Shape test
The rate of loading applied in crushing strength test is
- (a)
10 tonne/min
- (b)
20 tonne/min
- (c)
40 tonne/min
- (d)
400 tonne/min
If the modulus of subgrade reaction of a standard plate of 30 cm diameter is 16 kg/cm3 . The K-value for a standard plate of 75 cm diameter is
- (a)
6.4 kg/cm3
- (b)
7.4 kg/cm3
- (c)
8.0 kg/cm3
- (d)
9.3 kg/cm3
Using, IRC 37-1984 guidelines for the design of flexible pavements and the following data, choose the total thickness of the pavement.
Number of commercial vehicles when construction is completed=\(2723\frac { vehicles }{ day } \)
Annual growth rate of the traffic=5.0%
Design life of the pavement=10 yr
Vehicle damage factor=2.4
CBR value of subgrade soil=5%
Data for 5% CBR value
No.of standard axie(msa) | Total thickness(mm) |
---|---|
20 | 620 |
25 | 640 |
30 | 670 |
40 | 700 |
- (a)
620 mm
- (b)
640 mm
- (c)
670 mm
- (d)
700 mm
Triaxial test data for flexible pavement design is given as
Wheel load=3000kg
Radius of contact area=10 cm.
Traffic coefficient, X=1.5
Rainfall coefficient,Y=1.1
Modulus of subgrade soil (ES )=500kg/cm3
Modulus of base course material(Eb)=500kg/cm2
Design deflection, \(\Delta =0.254\quad cm\)
E-value of 5.5 cm thick bituminous concrete surface course=900kg/cm2
Thickness of base course material is
- (a)
6.69 cm
- (b)
33.47 cm
- (c)
26.78 cm
- (d)
40.16 cm
The width of the expansion joint is 20 mm in a cement concrete pavement.The laying temperature is \(20°C\)and the maximum slab temperature in summer is \(60°C\) .The coefficient of thermal expansion of concrete is \(10\times { 10 }^{ -6 }mm/mm/°C\) and the joint filler compresses upto 50% of the thickness.The spacing between expansion joints should be
- (a)
20 m
- (b)
25 m
- (c)
30 m
- (d)
40 m
What is the spacing between contraction joints for 4.0 m slab width having a thickness of 20 cm and f=1.5 for the RCC pavement having 1.0 cm bar dia at 0.30 in spacing?
- (a)
8.32 m
- (b)
9.68 m
- (c)
10.18 m
- (d)
11.32 m
The following data pertains to the number of commercial vehicles per day for the design of flexible pavement for a national highway as per IRC 37.1984
Type of commercial vehicle | No. of vehicles per day | Vehicle damage factor |
---|---|---|
Two-axie trucks | 2000 | 5 |
Tandem-axie trucks | 200 | 6 |
Assuming a traffic growth factor of 7.5% per annum for both types of vehicles.The cumulative number of standard axie load repetition for a design life of 10 yr is
- (a)
44.6
- (b)
57.8
- (c)
62.4
- (d)
78.7
The angularity number measures the voids in excess of
- (a)
21%
- (b)
33%
- (c)
50%
- (d)
67%
If the CBR value obtained at 5 mm penetration is higher than that at 2.5 mm, then the test is repeated for checking and if the check reveals the similar trend, then CBR value is to be reported as the
- (a)
mean values for 5 mm and 2.5 mm penetration
- (b)
higher value lower value
- (c)
lower value corresponding to 2.5 mm penetration
- (d)
the higher value obtained at 5 mm penetration
If the load, warping and frictional stresses in cement, concrete and slab are 210 N/mm2, 290 N/mm2 and 10 N/mm2 respectively.The critical combination of stresses during summer mid-day is
- (a)
290 N/mm2
- (b)
390 N/mm2
- (c)
490 N/mm2
- (d)
520 N/mm2
If average distance headway is 25 m, then the basic capacity of a traffic lane at speed of 72 km/h is
- (a)
2820 vehicles/h
- (b)
2500 vehicles/h
- (c)
1500 vehicles/h
- (d)
1000 vehicles/h
In context of flexible pavement design, the ratio of contact pressure to tyre pressure is called rigidity factor.This factor is less than unity when the tyre pressure is
- (a)
less than 0.56 N/mm2
- (b)
equal to 0.56 N/mm2
- (c)
equal to 0.7 N/mm2
- (d)
more than 0.7 N/mm2
Consider the following statements in the context of cement concrete pavements.
1.Warping Stresses in cement concrete pavements are caused by the seasonal variation in temperature.
2. The bars are generally provided across transverse joints of cement concrete pavements.The correct option evaluating the above statements is
- (a)
1 true and 2 false
- (b)
1 false and 2 true
- (c)
1 true and 2 true
- (d)
1 false and 2 false
A roundabout is provided with an average entry width of 8.4 m, width of weaving section is 14m and length of the weaving section between channelizing islands is 35.The crossing traffic and total traffic on the weaving section are 1000 and 2000 PCU/h respectively. The nearest rounded capacity of the round about (in PCU/h) is
- (a)
3300
- (b)
3700
- (c)
4500
- (d)
5200
The extra widening required for a two-lane NH at a horizontal curve of radius 300 m, considering a wheel base of 8 m and a design speed of 100 km/h is
- (a)
0.42 m
- (b)
0.62 m
- (c)
0.82 m
- (d)
0.92 m
The design speed on a road is 60 km/h.Assuming the driver reaction time of 2.5 s and coefficient of friction of pavement surface is 0.35, the required slopping distance for two-way traffic on a single lane road is
- (a)
82.1 m
- (b)
102.4 m
- (c)
164.2 m
- (d)
186.4 m
If due to some practical reasons, there is no friction, then this will results in the situation where
- (a)
the pressure on the outer wheel is zero.
- (b)
the pressure on the outer wheel is less than that of inner wheel.
- (c)
the pressure on the outer wheel is equal to that of inner wheel.
- (d)
the pressure on the outer wheel is more than that of inner wheel
A vehicle travels the transition curve of radius 150 m in duration 15 s at a design speed of 80 km/h.The rate of change of centrifugal acceleration is
- (a)
0.62 m/s2
- (b)
0.49 m/s2
- (c)
0.22 m/s2
- (d)
0.17 m/s2
On an urban road, the free mean speed was measured as 70 km/h and average spacing between the vehicles under Jam condition as 7.0 m. The speed flow-density equation is given by \(u={ u }_{ sf }\left[ 1-\frac { K }{ { K }_{ J } } \right] \) and q=uK
The maximum flow per lane for this condition is equal to
- (a)
2000
- (b)
2500
- (c)
3000
- (d)
3500
The design speed for NH is 100 km/h. If the maximum permissible super-elevation is 0.10 and the coefficient of lateral friction is 0.15, the ruling minimum radius of horizontal curve on the highway should be
- (a)
260 m
- (b)
315 m
- (c)
380 m
- (d)
410 m
A vehicle moving at 60 km/h on a ascending gradient of a highway has to come stop position to avoid collosion with a stationary object. The ratio of lag to brake distance is 6 : 5. Considering total reaction time of the driver is 2.5 s and the coefficient of longitudinal friction is 0.36, the value of ascending gradient (%) is
- (a)
3.3
- (b)
4.8
- (c)
5.3
- (d)
6.8
The data given below portion to the design of a flexible pavement. Initial traffic = 1213 cv/d
Traffic growth = 8% per annum
Design life = 12 yr
Vehicle damage factor = 2.5
Distribution factor = 1.0
The design traffic in terms of million standard axle (msa) would be
- (a)
0.06 msa
- (b)
8.40 msa
- (c)
21.00 msa
- (d)
32.26 msa
The design speed for NH is 100 km/h. If the maximum permissible super-elevation is 0.10 and the coefficient of lateral friction is 0.15, the ruling minimum radius of horizontal curve on the highway should be
- (a)
260 m
- (b)
315 m
- (c)
380 m
- (d)
410 m
For 20 cm thick cement concrete pavement, analysis of stresses gives the following values
Wheel load stress due to corner loading = 30 kg/cm2
Wheel load stress due to edge loading = 35 kg/cm2
Warping stress at corner region due to summer = 10 kg/cm2
Warping stress at corner region due to winter = 8 kg/cm2
Warping stress at edge region due to summer = 9 kg/cm2
Warping stress at corner region due to winter = 6 kg/cm2
Frictional stress during summer = 5 kg/cm2
Frictional stress during winter = 4 kg/cm2
(ii) The critical combination of stress during winter is
- (a)
34 kg/cm2
- (b)
38 kg/cm2
- (c)
45 kg/cm2
- (d)
41 kg/cm2
A fixed time 2-phase signal is to be provided at an intersection having a North-South and East-West road where only straight ahead traffic is permitted. The design hour flow (q) and saturation flow (s) are given as
N | S | E | W | |
Design hour flow (q) in PCU-s/hour | 800 | 400 | 750 | 1000 |
Saturation flow (S) in PCU-s/hour | 2400 | 2000 | 3000 | 3000 |
Effective green times for E-W phase will be
- (a)
28s
- (b)
26s
- (c)
24s
- (d)
22s