GATE ES concept:filtration PYQs & Answers

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Questions 1–2 of 2. Imported answers require independent review unless marked reviewed.

Topic practice 2 questionsPage 1 of 1

Choose the correct option(s) for removing solids from water.

Your answerSelect all correct options. You can choose more than one.

chlorination

coagulation-flocculation-sedimentation followed by slow sand filtration

chlorination followed by aeration

slow sand filtration

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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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GATE ES concept:filtration PYQs

How to practice concept:filtration

Question 45

Question 61