Environmental Engineering The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about 1.0 to 5.0 ppm 0.05 to 0.5 ppm 0.01 to 0.05 ppm 0.5 to 1.0 ppm 1.0 to 5.0 ppm 0.05 to 0.5 ppm 0.01 to 0.05 ppm 0.5 to 1.0 ppm ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering When there is no recirculation of sewage, then recirculation factor is 1 None of these Infinity 1 None of these Infinity ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The settling velocity of a particle in a sedimentation tank increases if None of these The surface area of tank is increased The depth of tank is decreased Particle size is decreased None of these The surface area of tank is increased The depth of tank is decreased Particle size is decreased ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The gas from sludge digestion tank is mainly composed of Methane Hydrogen sulphide Nitrogen Carbon dioxide Methane Hydrogen sulphide Nitrogen Carbon dioxide ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The hourly variation factor is usually taken as 2.0 1.5 2.7 1.8 2.0 1.5 2.7 1.8 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 100 ppm 400 ppm 200 ppm 300 ppm 100 ppm 400 ppm 200 ppm ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS