GATE ES 2022 Paper 1 — page 21

Complete GATE ES 2022 Paper 1 overview, original pages and practice · Timed previous-paper practice

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

Paper practice 65 questionsPage 21 of 22

Clean water is passed through a bed of uniform spherical sand and at a filtration velocity of 0.002 m/sec. The sand grains are 0.4 mm in diameter and have a specific gravity of 2.65. Bed depth is 0.67m and porosity (η) is 0.35. Given, water density = 998.2 kg/m

; water dynamic viscosity = 1.002×10

Pa.s. Friction factor (

) is given as:

where Re is Reynolds number. The headloss (in m, rounded off to three decimal places) calculated using the Carmen-Kozeny equation is __________.

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A sewage treatment plant with a capacity of 10 million litres per day (MLD) is treating the sewage through an aerobic biological process. The inlet and outlet BOD are measured as 100 and 30 mg/l, respectively. If the mixed microbial culture has an observed biomass yield of 0.5 g Volatile Suspended Solids (VSS)/g BOD, the sludge production rate (in kg per day, rounded off to one decimal place) when the plant is operating at 80% capacity will be __________.

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A centrifuge is processing 1000 litres per hour of water containing 2 g per litre of suspended solids. The thickened slurry coming out of the centrifuge has solids concentration of 20 g per 100 ml. If the centrifuge has 99% efficiency based on solids separation, the flow rate (in litres per hour, rounded off to one decimal place) of the supernatant stream will be __________.

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2022 · Paper 1

Question 61

Question 62

Question 63