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DFCCIL’21 CE: Daily Practice Quiz. 04-Aug-2021

Quiz: Civil Engineering
Exam: DFCCIL-JE
Topic: MISCELLANEOUS

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes

Q1. A vehicle is travelling at 80 km per hour. Assuming that the driver’s perception time is 1.5 second and the reaction time is 0.5 second, what is the stopping distance on a dry level concrete pavement for which the coefficient of friction between the pavement and the tyre is 0.35?
(a) 116.4 m
(b) 117.4 m
(c) 115.4 m
(d) 116.0 m

Q2. If the stopping distance and average length of a vehicle are 18 m and 6 m respectively, then the theoretical maximum capacity (vehicles per hour) of a traffic lane at a speed of 10 m/sec is
(a) 1500
(b) 2000
(c) 2500
(d) 3000

Q3. Bottom-most component of a flexible pavement, is
(a) Subgrade
(b) Sub-base
(c) Surface course
(d) Base course

Q4. The width of formation for a two-lane road for national highway is
(a) 10.0 m
(b) 12.0 m
(c) 14.0 m
(d) 16.0 m

Q5. Peak hour factor is expressed in percentage of
(a) ADT
(b) AADT
(c) PCU
(d) DF

Q6. A rail is designated by its
(a) Length
(b) Weight per unit length
(c) Only weight
(d) Cross-section

SOLUTION

S1. Ans.(a)
Sol. Given, Velocity (V) = 80 kmph
Total reaction time(t) = Perception time + Reaction time
= 1.5 + 0.5
T = 2 seconds
Coefficient of friction (f) = 0.35
Now,
Stopping sight distance (SSD) = vt+v^2/2gf
=80/3.6×6+(80/3.6)^2/(2×9.8×0.35)
=44.44+71.986
=116.430 m.

S2. Ans.(a)
Sol. Given,
Space headway (S) = sight distance + average length of vehicle (L)= 18 + 6 = 24 m.
Speed (V) = 10 m/sec = 10 × 3.6 = 36 km/hour
Theoretical maximum capacity (C) = 1000V/S
=(1000× 36 )/24
=1500 veh.\/hour

S3. Ans.(a)
Sol. Bottom – most component of a flexible pavement is subgrade.

 

 

DFCCIL'21 CE: Daily Practice Quiz. 04-Aug-2021 |_30.1

DFCCIL'21 CE: Daily Practice Quiz. 04-Aug-2021 |_40.1

S5. Ans.(b)
Sol. Peak hour factor is expressed in percentage of annual average daily traffic (AADT) and it is used in the design of transportation facilities and major projects.

S6. Ans.(b)
Sol. A rail is designated by its weight per unit length.

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