Environmental Engineering The chemical most commonly used to increase speed of sedimentation of sewage is Sulphuric acid Copper sulphate Lime Sodium permanganate Sulphuric acid Copper sulphate Lime Sodium permanganate ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering For a given discharge, the efficiency of sedimentation tank can be increased by Increasing the surface area of tank Increasing the depth of tank Decreasing the depth of tank Decreasing the surface area of tank Increasing the surface area of tank Increasing the depth of tank Decreasing the depth of tank Decreasing the surface area of tank ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The rate of Alteration of pressure filters is Less than that of slow sand filters Greater than that of rapid sand filters Equal to that of slow sand filters In between the filtration rate of slow sand filters and rapid sand filters Less than that of slow sand filters Greater than that of rapid sand filters Equal to that of slow sand filters In between the filtration rate of slow sand filters and rapid sand filters ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally More and more Less and less More and less Less and more More and more Less and less More and less Less and more ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of 1000 mg/liter 10 mg/liter 100 mg/liter 1 mg/liter 1000 mg/liter 10 mg/liter 100 mg/liter 1 mg/liter ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be 20 mm/hr 10 mm/hr 4 mm/hr 40 mm/hr 20 mm/hr 10 mm/hr 4 mm/hr 40 mm/hr ANSWER DOWNLOAD EXAMIANS APP
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