Environmental Engineering The effective size of sand particles used in slow sand filters is 1.00 to 1.80 mm 0.35 to 0.60 mm 0.60 to 1.00 mm 0.25 to 0.35 mm 1.00 to 1.80 mm 0.35 to 0.60 mm 0.60 to 1.00 mm 0.25 to 0.35 mm ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The disinfection efficiency of chlorine increases by (i) Decreasing the time of contact (ii) Decreasing the temperature of water (iii) Increasing the temperature of water Only (iii) Only (i) Both (i) and (ii) Both (i) and (iii) Only (iii) Only (i) Both (i) and (ii) Both (i) and (iii) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Corrosion in concrete sewers is caused by Nitrogen Dissolved oxygen Chlorine Septic conditions Nitrogen Dissolved oxygen Chlorine Septic conditions 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 300 ppm 200 ppm 400 ppm 100 ppm 300 ppm 200 ppm 400 ppm 100 ppm ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The detention period in coagulation tanks is usually kept as 2 to 6 hours 30 to 45 minutes 1 to 2 minutes 2 to 6 days 2 to 6 hours 30 to 45 minutes 1 to 2 minutes 2 to 6 days ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank Only (i) (i) and (ii) Only (iii) (i) and (iii) Only (i) (i) and (ii) Only (iii) (i) and (iii) ANSWER DOWNLOAD EXAMIANS APP
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