GATE CE 2018 Paper 2 — page 21

Questions 61–63 of 65. Imported answers require review unless explicitly marked reviewed.

At a small water treatment plant which has 4 filters, the rates of filtration and backwashing are 200 m

/d/m

and 1000 m

/d/m

, 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 _____

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A schematic flow diagram of a completely mixed biological reactor with provision for recycling of solids is shown in the figure.

Diagram for Civil Engineering question 52

S₀, S = readily biodegradable soluble BOD, mg/L Q, Qᵣ, Qw = flow rates, m

/d X₀, X, Xₑ, Xᵤ = microorganism concentrations (mixed-liquor volatile suspended solids or MLSS), mg/L

The mean cell residence time (in days, up to one decimal place) is _____

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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 _____

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2018 · Paper 2

Question 51

Question 52

Question 53