Environmental Engineering in CE Cleaning is done by(i) Scraping and removal in filters slow sand(ii) Back washing in slow sand filters(iii) Scraping and removal in filters rapid sand(iv) Back washing in rapid sand filtersThe correct answer is (i) and (iv) (ii) and (iii) (ii) and (iv) (i) and (ii) (i) and (iv) (ii) and (iii) (ii) and (iv) (i) and (ii) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan Neither A nor B With greater number of blades Both A & B Of increased diameter Neither A nor B With greater number of blades Both A & B Of increased diameter ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur. 50 3000 (i.e. 0.3%) 500 1000 50 3000 (i.e. 0.3%) 500 1000 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Scale formation in boiler is controlled by Eliminating H₂S in feed water Preheating of feed water Keeping the pH value of feed water just below 7 Reduction in hardness, silica & alumina in feed water Eliminating H₂S in feed water Preheating of feed water Keeping the pH value of feed water just below 7 Reduction in hardness, silica & alumina in feed water ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air. Hydrogen flouride Hydrocarbons Nitrogen dioxide Hydrogen sulphides Hydrogen flouride Hydrocarbons Nitrogen dioxide Hydrogen sulphides ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Which of the following processes is involved in the biochemical treatment of sewage effluents? Fermentation Reduction Dehydration Oxidation Fermentation Reduction Dehydration Oxidation ANSWER DOWNLOAD EXAMIANS APP
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