GATE CE year:2018 PYQs & Answers — Page 12 — Exam Papers

Questions 111–120 of 130. Imported answers require independent review unless marked reviewed.

Topic practice 130 questionsPage 12 of 13

The void ratio of a soil is 0.55 at an effective normal stress of 140 kPa. The compression index of the soil is 0.25. In order to reduce the void ratio to 0.4, an increase in the magnitude of effective normal stress (in kPa, up to one decimal place) should be _____

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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.

Diagram for Civil Engineering question 46

The gauge pressure value (in kN/m², up to two decimal places) of p₁ is ______

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A rigid smooth retaining wall of height 7 m with vertical backface retains saturated clay as backfill. The saturated unit weight and undrained cohesion of the backfill are 17.2 kN/m³ and 20 kPa, respectively. The difference in the active lateral forces on the wall (in kN per meter length of wall, up to two decimal places), before and after the occurrence of tension cracks is _____

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The total rainfall in a catchment of area 1000 km², during a 6 h storm, is 19 cm. The surface run off due to this storm computed from triangular direct runoff hydrograph is 1×10^8 m³. The ϕ_index for this storm (in cm/h, up to one decimal place) is ______

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Rainfall depth over a watershed is monitored through six number of well distributed rain gauges. Gauged data are given below

Rain Gauge Number	1	2	3	4	5	6
Rainfall Depth (mm)	470	465	435	525	480	510
Area of Thiessen Polygon (×10⁴ m²)	95	100	98	80	85	92

The Thiessen mean value (in mm, up to one decimal place) of the rainfall is _____

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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 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

, 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 ______

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The infiltration rate

in a basin under ponding condition is given by

, where,

is in mm/h and

is time in hour. Total depth of infiltration (in mm, up to one decimal place) during the last 20 minutes of a storm of 30 minutes duration is _____

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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 N s/m², respectively. The theoretical power required to achieve the stated value of G (in kW, up to two decimal places) is ______

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In a laboratory, a flow experiment is performed over a hydraulic structure. The measured values of discharge and velocity are 0.05 m³/s and 0.25 m/s, respectively. If the full scale structure (30 times bigger) is subjected to a discharge of 270 m³/s, then the time scale (model to full scale) value (up to two decimal places) is _____

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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 ______

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