Civil Engineering
GATE CE year:2022 PYQs
Build your understanding with focused practice from past exam papers.
Questions 121–130 of 130. Imported answers require independent review unless marked reviewed.
Question 61
Open questionCENAT2 marksNeeds review
A water treatment plant has a sedimentation basin of depth 3 m, width 5 m, and length 40 m. The water inflow rate is 500 m³/h. The removal fraction of particles having a settling velocity of 1.0 m/h is ________. (round off to one decimal place)
(Consider the particle density as 2650 kg/m³ and liquid density as 991 kg/m³)
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Open questionCENAT2 marksNeeds review
A sample of air analyzed at 25 °C and 1 atm pressure is reported to contain 0.04 ppm of SO
. Atomic mass of S = 32, O = 16.The equivalent SO
concentration (in μg/m
) will be __________. (round off to the nearest integer)Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 62
Open questionCENAT2 marksNeeds review
A two-phase signalized intersection is designed with a cycle time of 100 s. The amber and red times for each phase are 4 s and 50 s, respectively. If the total lost time per phase due to start-up and clearance is 2 s, the effective green time of each phase is _____s. (in integer)
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A parabolic vertical crest curve connects two road segments with grades +1.0% and −2.0%. If a 200 m stopping sight distance is needed for a driver at a height of 1.2 m to avoid an obstacle of height 0.15 m, then the minimum curve length should be ______ m. (round off to nearest integer)
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At a traffic intersection, cars and buses arrive randomly according to independent Poisson processes at an average rate of 4 vehicles per hour and 2 vehicles per hour, respectively. The probability of observing at least 2 vehicles in 30 minutes is ______. (round off to two decimal places)
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Assuming that traffic on a highway obeys the Greenshields model, the speed of a shockwave between two traffic streams (P) and (Q) as shown in the schematic is ______ kmph. (in integer)
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Open questionCENAT2 marksNeeds review
The vehicle count obtained in every 10 minute interval of a traffic volume survey done in peak one hour is given below.
Time Interval (in minutes) | Vehicle Count |
|---|---|
0 – 10 | 10 |
10 – 20 | 11 |
20 – 30 | 12 |
30 – 40 | 15 |
40 – 50 | 13 |
50 – 60 | 11 |
The peak hour factor (PHF) for 10 minute sub-interval is ________. (round off to one decimal place)
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Open questionCENAT2 marksNeeds review
It is given that an aggregate mix has 260 grams of coarse aggregates and 240 grams of fine aggregates. The specific gravities of the coarse and fine aggregates are 2.6 and 2.4, respectively. The bulk specific gravity of the mix is 2.3.
The percentage air void in the mix is __________. (round off to the nearest integer)
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Open questionCENAT2 marksNeeds review
For the dual-wheel carrying assembly shown in the figure, P is the load on each wheel, a is the radius of the contact area of the wheel, s is the spacing between the wheels, and d is the clear distance between the wheels. Assuming that the ground is an elastic, homogeneous, and isotropic half space, the ratio Equivalent Single Wheel Load (ESWL) at depth z = d/2 to the ESWL at depth z = 2s is ________. (round off to one decimal place)
(Consider the influence angle to be 45° for the linear dispersion of stress with depth)
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Open questionCENAT2 marksNeeds review
The lane configuration with lane volumes in vehicles per hour of a four-arm signalized intersection is shown in the figure. There are only two phases: the first phase is for the East-West and the West-East through movements, and the second phase is for the North-South and the South-North through movements. There are no turning movements. Assume that the saturation flow is 1800 vehicles per hour per lane for each lane and the total lost time for the first and the second phases together is 9 seconds.
The optimum cycle length (in seconds), as per the Webster’s method, is __________. (round off to the nearest integer)
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