Environmental Engineering The rate of filtration in slow sand filters in million litres per day per hectare is about 50 to 60 100 to 150 500 to 600 1400 to 1500 50 to 60 100 to 150 500 to 600 1400 to 1500 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be 200 ppm 300 ppm 400 ppm 100 ppm 200 ppm 300 ppm 400 ppm 100 ppm ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Alkalinity in water is expressed as milligrams per litre in terms of equivalent Magnesium carbonate Calcium hydroxide Calcium carbonate Sodium carbonate Magnesium carbonate Calcium hydroxide Calcium carbonate Sodium carbonate ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be X/2 2X X X/4 X/2 2X X X/4 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is (i) and (ii) (ii) and (iii) (i) and (iv) (ii) and (iv) (i) and (ii) (ii) and (iii) (i) and (iv) (ii) and (iv) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The treatment of water with bleaching powder is known as Super chlorination De-chlorination Pre-chlorination Hypo-chlorination Super chlorination De-chlorination Pre-chlorination Hypo-chlorination ANSWER DOWNLOAD EXAMIANS APP
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