Environmental Engineering 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 filters The correct answer is (ii) and (iv) (ii) and (iii) (i) and (ii) (i) and (iv) (ii) and (iv) (ii) and (iii) (i) and (ii) (i) and (iv) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering For a given discharge, the efficiency of sedimentation tank can be increased by Decreasing the surface area of tank Increasing the depth of tank Increasing the surface area of tank Decreasing the depth of tank Decreasing the surface area of tank Increasing the depth of tank Increasing the surface area of tank Decreasing the depth of tank ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The major disadvantage of lime soda process of water softening is that It is unsuitable for turbid and acidic water It is unsuitable for softening the water of excessive hardness Huge amount of precipitate is formed which creates a disposal problem The effluent cannot be reduced to zero hardness It is unsuitable for turbid and acidic water It is unsuitable for softening the water of excessive hardness Huge amount of precipitate is formed which creates a disposal problem The effluent cannot be reduced to zero hardness ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called Soil pipe Anti-siphonage pipe Vent pipe Waste pipe Soil pipe Anti-siphonage pipe Vent pipe Waste pipe 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 (i) Only (iii) Both (i) and (ii) Both (i) and (iii) Only (i) Only (iii) Both (i) and (ii) Both (i) and (iii) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The settling velocity of a particle in a sedimentation tank increases if Particle size is decreased The surface area of tank is increased The depth of tank is decreased None of these Particle size is decreased The surface area of tank is increased The depth of tank is decreased None of these ANSWER DOWNLOAD EXAMIANS APP
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