Quiz: Civil Engineering
Exam: SSC-JE
Topic: Transportation Engineering
Each question carries 1 mark
Negative marking: 1/4 mark
Time: 10 Minutes
Q1. A vehicle has a wheel base of 5.5 m. What is the off-tracking while negotiating a curved path with a mean radius 30 m?
(a) 0.6
(b) 0.7
(c) 0.4
(d) 0.5
Q2. The stopping sight distance (SSD) for two-way traffic, with single lane, and the stopping distance (SD) are related as:
(a) SSD = S D
(b) SSD = 2 SD
(c) SSD = SD/2
(d) SSD = 4SD
Q3. Maximum number of vehicles that can pass a given point on a lane during one hour without creating unreasonable delay, is known as
(a) traffic density of lane
(b) basic capacity of lane
(c) probable capacity of lane
(d) practical capacity of lane
Q4. The absolute minimum radius of horizontal curve for a design speed 60 kmph is
(a)131 m
(b)210m
(c)360m
(d)none of these
Q5. The rate of change of radial acceleration as per IRC recommendations for computing length of transition curve for a vehicle with design speed V kmph is given by
(a) 85/(70+V) m/sec³
(b) 65/(70+V) m/sec³
(c) 80/(75+V) m/sec³
(d) 72/(65+V) m/sec³
Q6. If an ascending gradient of 1 in 50 meets another ascending gradient of 1 in 30 then the deviation angle is
(a) 1/50
(b) 1/75
(c) 1/30
(d) 8/150
Q7. Width of carriage way for a single lane is recommended to be
(a) 7.5 m
(b) 7.0 m
(c) 3.75 m
(d) 5.5 m
Q8. Camber on highway pavement is provided to take care of
(a) centrifugal force
(b) drainage
(c) sight distance
(d) off-tracking
Q9. The land-width required across the alignment of road is
(a) land between building lines
(b) right of way
(c) land between control lines
(d) roadway
Q10. Road alignment is influenced by
(a) traffic requirements
(b) stability of hill slopes
(c) number of cross drainage works
(d) all of the above
SOLUTIONS
S1. Ans.(d)
Sol. Given, length of wheel base (l) = 5.5 m
Radius (R) = 30 m.
Off tracking = ?
Now,
Off Tracting =l^2/2R
=(5.5)^2/(2×30)
=0.50
S2. Ans.(b)
Sol.
| S.No. | Condition | Stopping sight distance |
| 1. | One lane one way | SSD |
| 2. | One lane two way | 2SSD |
| 3. | Two lane two way | SSD |
S3. Ans.(d)
Sol. Practical capacity of lane is defined as the maximum number of vehicles that can pass a given point on a lane during one hour without creating unreasonable delay.
S4. Ans.(d)
Sol. According to IRC, the maximum super elevation for plain and rolling terrain –
e = 0.07
f = 0.15
Given, V = 60 kmph
Absolute minimum radius
e+f=V^2/127R
0.07+0.15 =(60)^2/127R
▭(R=128.8 m )
S5. Ans.(c)
Sol. if V is the design speed in kmph, then the rate of change of radial acceleration as per IRC recommendations for computing length of transition curve is given by –
▭(C=80/(75+V)) (m\/sec^3 ).
S6. Ans.(b)
Sol. Given, Ascending gradient (n_1 ) = + (1/50)
Ascending gradient (n_2 )= +(1/30)
Deviation angle (N) = ?
N=|n_1-n_2 |
=|1/50-1/30|
∵|(30-50)/(50×30)|
=20/(50×30)
▭(N=1/75)
S7. Ans.(c)
Sol. Width of pavement-
| Number of lane | Width of pavement |
| Single lane
Two lane without kerb Two lane with kerb Intermediate lane Multiple lane |
3.75 m.
7.0 m 7.5 m 5.5 m 3.5 m/lane |
S8. Ans.(b)
Sol. the minimum super-elevation on curve should not be less than camber. The function of camber provide on curves is to ensure proper drainage.
S9. Ans.(b)
Sol. Right of way is the area of land acquired for the road, along its alignment. The width of this acquired land is known as land width and it depends on the importance of the road and possible future development
S10. Ans.(d)
Sol. factors which govern the alignment of road are.
→ obligatory points
→ Traffic
→ Geometric design
→ Economy
→ Stability of hill drainage and geometric standard of hill roads.
