Environmental Engineering The rate of filtration in slow sand filters in million litres per day per hectare is about 50 to 60 100 to 150 1400 to 1500 500 to 600 50 to 60 100 to 150 1400 to 1500 500 to 600 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The velocity of flow of water in a sedimentation tank is about 15 to 30 cm/sec 5 to 10 cm/sec 15 to 30 cm/minute 15 to 30 cm/hour 15 to 30 cm/sec 5 to 10 cm/sec 15 to 30 cm/minute 15 to 30 cm/hour ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering For a given discharge, the efficiency of sedimentation tank can be increased by Decreasing the surface area of tank Increasing the depth of tank Decreasing the depth of tank Increasing the surface area of tank Decreasing the surface area of tank Increasing the depth of tank Decreasing the depth of tank Increasing the surface area of tank ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as 6.5 to 8.0 10.5 to 12.0 4.5 to 6.0 8.5 to 10.0 6.5 to 8.0 10.5 to 12.0 4.5 to 6.0 8.5 to 10.0 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is (i) Presumptive coli-form test (ii) Confirmed coli-form test (iii) Completed coli-form test All (i), (ii) and (iii) Both (i) and (iii) Only (i) Both (i) and (ii) All (i), (ii) and (iii) Both (i) and (iii) Only (i) Both (i) and (ii) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The alum, when added as a coagulant in water Does not affect pH value of water Decreases pH value of water Does not require alkalinity in water for flocculation Increases pH value of water Does not affect pH value of water Decreases pH value of water Does not require alkalinity in water for flocculation Increases pH value of water ANSWER DOWNLOAD EXAMIANS APP