GATE CE 2022 Paper 1 — page 20

Questions 58–60 of 65. Imported answers require review unless explicitly marked reviewed.

Depth of water flowing in a 3 m wide rectangular channel is 2 m. The channel carries a discharge of 12 m³/s. Take

m/s².

The bed width (in m) at contraction, which just causes the critical flow, is ________ without changing the upstream water level. (round off to two decimal places)

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A wastewater sample contains two nitrogen species, namely ammonia and nitrate. Consider the atomic weight of N, H, and O as 14 g/mol, 1 g/mol, and 16 g/mol, respectively. In this wastewater, the concentration of ammonia is 34 mg NH₃/liter and that of nitrate is 6.2 mg NO₃⁻/liter. The total nitrogen concentration in this wastewater is ______ milligram nitrogen per liter. (round off to one decimal place)

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A 2 % sewage sample (in distilled water) was incubated for 3 days at 27 °C temperature. After incubation, a dissolved oxygen depletion of 10 mg/L was recorded. The biochemical oxygen demand (BOD) rate constant at 27 °C was found to be 0.23 day⁻¹ (at base e).

The ultimate BOD (in mg/L) of the sewage will be____________. (round off to the nearest integer)

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2022 · Paper 1

Question 58

Question 59

Question 60