Environmental Engineering in CE BOD of raw municipal sewage may be in the range of about __________ mg/litre. 5-10 2000-3000 1-2 150-300 5-10 2000-3000 1-2 150-300 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it. Ozone Carbon dioxide Hydrogen None of these Ozone Carbon dioxide Hydrogen None of these ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Noise pollution level in a chemical plant is expressed in Hertz None of these Roentgen Decibel Hertz None of these Roentgen Decibel ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by Radial settling tank (thickener) using coagulant (lime & ferrous sulphate) Biological oxygen pond Lagoons Filtration Radial settling tank (thickener) using coagulant (lime & ferrous sulphate) Biological oxygen pond Lagoons Filtration ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the Biological oxygen demand (BOD) Bacterial stability factor Oxygen ion concentration Relative stability Biological oxygen demand (BOD) Bacterial stability factor Oxygen ion concentration Relative stability ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE 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 (i) Both (i) and (iii) Both (i) and (ii) Only (iii) Only (i) Both (i) and (iii) Both (i) and (ii) Only (iii) ANSWER DOWNLOAD EXAMIANS APP
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