Environmental Science and Engineering
GATE ES area:environmental-engineering PYQs
Build your understanding with focused practice from past exam papers.
Questions 51–55 of 55. Imported answers require independent review unless marked reviewed.
Question 43
Open questionESNAT2 marksNeeds review
The concentration of NO₂ in the air at NTP is reported as 0.30 ppm (ppm by volume). The concentration of NO₂ in μg/m³ is ________ (rounded off to the nearest integer).
[At NTP, temperature = 298 K, pressure = 1 atm, and one mole of ideal gas occupies 24.45 L]
[Molecular weight of NO₂ = 46 g/mol]
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In open channel flow, the specific energy is the total energy per unit weight of a fluid, where the component potential energy is measured from the bed of the channel as the datum.
A rectangular channel of 10 m width carries 20 m³/s of water. The depth of flowing water is 1 m. The specific energy for this flow condition is ________ m (rounded off to one decimal place).
Consider acceleration due to gravity (g) = 10 m/s².
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Two reservoirs are connected by a pipeline consisting of two pipes ‘A’ and ‘B’ in series. The two pipes are of same length and have the same Darcy friction factor. If the internal diameter of pipe ‘B’ is twice as large as the internal diameter of pipe ‘A’, the ratio of the head loss in pipe ‘A’ to that in pipe ‘B’ is ______ (answer in integer). Neglect all minor losses.
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A 900 mm internal diameter sewer is laid at a slope of 0.004 and has an actual flow of 0.15 m³/s. Assuming Manning’s roughness coefficient to be 0.013, the ratio of the actual flow to the flow when the sewer is running full is ______ (rounded off to two decimal places). Take
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A 10 million litres per day (MLD) sewage treatment plant (STP) is based on the Activated Sludge Process (ASP). First, the sewage undergoes primary treatment and the resulting treated sewage has BOD₅ of 140 mg/L concentration. This is further passed through a 1500 m³ capacity aeration tank (in ASP), where the mixed liquor volatile suspended solids (MLVSS) concentration is maintained at 300 mg/L. The concentration of BOD₅ of the treated sewage is 5 mg/L. The Food to Microorganism ratio (F/M) of the ASP is ______ day⁻¹ (rounded off to two decimal places).
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