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Civil Engineering GATE 2018 Set-2 Questions with Answer
Ques 53 Civil
The compression curve (void ratio, e vs. effective stress, σ'v) for a certain clayey soil is a straight line in a semi-logarithmic plot
and it passes through the points (e = 1.2; σ'v = 50 kPa) and (e = 0.6; σ'v = 800 kPa).
The compression index (up to two decimal places) of the soil is _______.
0.45 to 0.55 is the correct answer.
Ques 54 Civil
The total horizontal and vertical stresses at a point X in a saturated sandy medium are 170 kPa and 300 kPa, respectively. The static pore-water pressure is 30 kPa. At failure, the excess pore-water pressure is measured to be 94.50 kPa, and the shear stresses on the vertical and horizontal planes passing through the point X are zero. Effective cohesion is 0 kPa and effective angle of internal friction is 36°. The shear strength (in kPa, up to two decimal places) at point X is _______.
51.50 to 53.50 is the correct answer.
Ques 55 Civil
A group of nine piles in a 3 × 3 square pattern is embedded in a soil strata comprising dense sand underlying recently filled clay layer, as shown in the figure. The perimeter of an individual pile is 126 cm. The size of pile group is 240 cm × 240 cm. The recently filled clay has undrained shear strength of 15 kPa and unit weight of 16 kN/m3.
472.00 to 472.50 is the correct answer.
Ques 56 Civil
A three-fluid system (immiscible) is connected to a vacuum pump. The specific gravity values of the fluids (S1, S2) are given in the figure.
-9.0 to -8.0 is the correct answer.
Ques 57 Civil
The total rainfall in a catchment of area 1000 km2, during a 6 h storm, is 19 cm. The surface runoff due to this storm computed from a triangular direct runoff hydrograph is 1 × 108 m3. The φ-index for this storm (in cm/h, up to one decimal place) is _______.
1.50 to 1.50 is the correct answer.
Ques 58 Civil
A rough pipe of 0.5 m diameter, 300 m length, and roughness height of 0.25 mm carries water (kinematic viscosity = 0.9 × 10-6 m2/s) with a velocity of 3 m/s. Friction factor (f) for laminar flow is given by f = 64/Re, and for turbulent flow, it is given by: 1/√f = 2 log10(r/k) + 1.74, where Re = Reynolds number, r = radius of pipe, k = roughness height, and g = 9.81 m/s2. The head loss (in m, up to three decimal places) in the pipe due to friction is _______.
4.50 to 4.70 is the correct answer.
Ques 59 Civil
A flocculation tank contains 1800 m3 of water, which is mixed using paddles at an average velocity gradient G of 100/s. The water temperature and the corresponding dynamic viscosity are 30 °C and 0.798 × 10-3 Ns/m2, respectively. The theoretical power required to achieve the stated value of G (in kW, up to two decimal places) is _______.
14.00 to 15.00 is the correct answer.
Ques 60 Civil
A coal containing 2% sulfur is burned completely to ash in a brick kiln at a rate of 30 kg/min. The sulfur content in the ash was found to be 6% of the initial amount of sulfur present in the coal fed to the brick kiln. The molecular weights of S, H, and O are 32, 1, and 16 g/mole, respectively. The annual rate of sulfur dioxide (SO2) emission from the kiln (in tonnes/year, up to two decimal places) is _______.
590.00 to 595.00 is the correct answer.
Ques 61 Civil
At a small water treatment plant which has 4 filters, the rates of filtration and backwashing are 200 m3/d/m2 and 1000 m3/d/m2, respectively. Backwashing is done for 15 min per day. The maturation, which occurs initially as the filter is put back into service after cleaning, takes 30 min. It is proposed to recover the water being wasted during backwashing and maturation. The percentage increase in the filtered water produced (up to two decimal places) would be _______.
7.75 to 7.95 is the correct answer.
Ques 62 Civil
A schematic flow diagram of a completely mixed biological reactor with provision for recycling of solids is shown in the figure.
Q, Qr, Qw = flow rates, m3/d
X0, X, Xv, Xu = microorganism concentrations (mixed-liquor volatile suspended solids or MLVSS), mg/L.
The mean cell residence time (in days, up to one decimal place) is _______.
7.5 to 7.5 is the correct answer.
Ques 63 Civil
The space mean speed (kmph) and density (vehicles/km) of a traffic stream are linearly related. The free flow speed and jam density are 80 kmph and 100 vehicles/km respectively. The traffic flow (in vehicles/h, up to one decimal place) corresponding to a speed of 40 kmph is _______.
2000.0 to 2000.0 is the correct answer.
Ques 64 Civil
A 7.5 m wide two-lane road on a plain terrain is to be laid along a horizontal curve of radius 510 m. For a design speed of 100 kmph, super-elevation is provided as per IRC: 73-1980. Consider acceleration due to gravity as 9.81 m/s2. The level difference between the inner and outer edges of the road (in m, up to three decimal places) is _______.
0.520 to 0.530 is the correct answer.
Ques 65 Civil
An aerial photograph of a terrain having an average elevation of 1400 m is taken at a scale of 1:7500. The focal length of the camera is 15 cm. The altitude of the flight above mean sea level (in m, up to one decimal place) is _______.
2520.0 to 2530.0 is the correct answer.
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