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) (i) and (iv) (i) and (ii) (ii) and (iii) (ii) and (iv) (i) and (iv) (i) and (ii) (ii) and (iii) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The settling velocity of a particle in a sedimentation tank increases if The depth of tank is decreased The surface area of tank is increased None of these Particle size is decreased The depth of tank is decreased The surface area of tank is increased None of these Particle size is decreased ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Average rate of water consumption per head per day as per Indian Standard is 135 liters 165 liters 100 liters 200 liters 135 liters 165 liters 100 liters 200 liters ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is Infinite Zero 100 1 Infinite Zero 100 1 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The rate of BOD exerted at any time is Inversely proportional to BOD remaining Directly proportional to BOD satisfied Directly proportional to BOD remaining Inversely proportional to BOD satisfied Inversely proportional to BOD remaining Directly proportional to BOD satisfied Directly proportional to BOD remaining Inversely proportional to BOD satisfied ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The maximum efficiency of BOD removal is achieved in Oxidation ditch Oxidation pond Trickling filters Aerated lagoons Oxidation ditch Oxidation pond Trickling filters Aerated lagoons ANSWER DOWNLOAD EXAMIANS APP
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