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GATE (CE) 2022: ENVIRONMENT#26 (App update required to attempt this test)
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Question 1
A mixed liquor with 2000 mg/L of suspended solids is placed in an Imhoff’s one. Assuming the safe sludge volume Index to be 120 mL/g, what will be the maximum settleable volume for the liquor to be considered safely settleable.
Question 2
For a small town with a daily supply of 500000 litres of water; 0.6 ppm of chlorine is required for treatment. The available bleaching power has 20% available chlorine. Estimate the quantity of bleaching powder required per day.
Question 3
Which of the following mechanism are present in a slow sand filter?
1) Sedimentation
2) Disinfection
3) Mechanical straining
4) Electrolytic changes
Question 4
A circular Sedimentation tank needs to be designed to carry a discharge of 2.5 MLD. Find the dimension of the tank if the ratio of height to diameter is 1.5. Assume the detention time for the tank is 1.65 hours.
Question 5
A water sample is found to be contain 175 mg/l of calcium carbonate hardness in terms of Ca(HCO3)2 and 146 mg/l of magnesium carbonate hardness in terms of Mg(HCO3)2. What is the amount of Ca(OH)2 (in kg) required to treat 2 million liters of water.
Question 6
A sewer of diameter 300 mm and bed slope 1 in 500, running half full, has a flow velocity of 0.62 m/sec. If the bed slope is increased to 1 in 100 then the velocity of flow is _____m/sec.
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Sep 9ESE & GATE CE