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 Both (i) and (iii) Only (i) Both (i) and (ii) Only (iii) Both (i) and (iii) Only (i) Both (i) and (ii) Only (iii) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Lagoons used for purification of polluted water Use micro-organisms/bacteria in presence of dissolved oxygen Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre All of these Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds Use micro-organisms/bacteria in presence of dissolved oxygen Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre All of these Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels. 185 105 160 135 185 105 160 135 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Solid content in most of the domestic sewage is about __________ percent. 0.1 10 0.001 5 0.1 10 0.001 5 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) Filtration Biological oxygen pond Lagoons Radial settling tank (thickener) using coagulant (lime & ferrous sulphate) Filtration Biological oxygen pond Lagoons ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Which of the following is the most severe air pollutant? SO₂ NOx CO Hydrocarbons SO₂ NOx CO Hydrocarbons ANSWER DOWNLOAD EXAMIANS APP
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