Environmental Engineering Alum as a coagulant is found to be most effective when pH range of water is 8 to 10 2 to 4 6 to 8 4 to 6 8 to 10 2 to 4 6 to 8 4 to 6 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The percentage of filtered water, which is used for backwashing in rapid sand filters, is about 0.2 to 0.4 2 to 4 5 to 7 0.4 to 1.0 0.2 to 0.4 2 to 4 5 to 7 0.4 to 1.0 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The settling velocity of a particle in a sedimentation tank depends on Both depth and surface area of tank None of these Depth of tank Surface area of tank Both depth and surface area of tank None of these Depth of tank Surface area of tank ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank Only (iii) Only (i) (i) and (ii) (i) and (iii) Only (iii) Only (i) (i) and (ii) (i) and (iii) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering For normal sludge, the value of sludge index for Indian conditions is 50 to 150 150 to 350 350 to 500 0 to 50 50 to 150 150 to 350 350 to 500 0 to 50 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 10 mm/hr 40 mm/hr 20 mm/hr 4 mm/hr 10 mm/hr 40 mm/hr 20 mm/hr 4 mm/hr ANSWER DOWNLOAD EXAMIANS APP
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