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GATE CE 2019 ENVIRO Revision Quiz 1 (App update required to attempt this test)
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Question 1
Find the dissolved oxygen in the sewage sample which is discharged into a river of flow 2 m3/s having dissolved oxygen 120 mg/l, the resultant dissolved oxygen becomes 90 mg/l. If the initial oxygen in the sewage was 6 mg/l. Then the sewage flow is
Question 2
Considering the process of coagulation, when the coagulants such as alum are used then
Question 3
Determine the critical deficit (in ppm) of dissolved oxygen when the stream flowing at a rate of 210 cumec with saturated dissolved oxygen limit of 10.6ppm is diluted with a sewage flowing at the rate of 1.35 cumec. Assume the Dissolved oxygen limit of waste water as 4ppm.
Question 4
A colony of 500 residents has water supply of 75 lpcd. A septic tank is to be designed with detention period of 24 hours. Further the effluent from the septic tank is to be disposed where the percolation rate is 25 minutes.
The percolation area required for the disposal of the effluent _____ m2.
The percolation area required for the disposal of the effluent _____ m2.
Question 5
A reactor has an inflow of sewage 180 liters/min. The influent COD is 1000 mg/l and the effluent COD is 250 mg/l. The waste water contains 50% of biodegradable waste. The volume of methane gas produced per day is _____ m3.
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Nov 20ESE & GATE CE
