Environmental Science and Engineering
GATE ES topic:water-treatment PYQs
Build your understanding with focused practice from past exam papers.
Questions 11–14 of 14. Imported answers require independent review unless marked reviewed.
Question 61
Open questionESNAT2 marksNeeds review
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 __________.Log in to check the answer
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Open questionESMCQ1 markNeeds review
Which of the following causes ‘Type-I’ settling in a sedimentation tank?
Your answerChoose one option.
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Open questionESMCQ1 markNeeds review
Chlorine is most effective as a water disinfectant at a pH of __________.
Your answerChoose one option.
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Open questionESNAT1 markNeeds review
A flocculation tank used for water treatment has a velocity gradient (G) of 800 s⁻¹. The volume of the tank is 40 m³. The dynamic viscosity of water is 9×10⁻⁴ N·s/m². The theoretical power required to maintain the given velocity gradient is __________ kW (rounded off to the nearest integer).
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