Environmental Engineering The rate of filtration in slow sand filters in million litres per day per hectare is about 500 to 600 50 to 60 1400 to 1500 100 to 150 500 to 600 50 to 60 1400 to 1500 100 to 150 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The percentage of filtered water, which is used for backwashing in rapid sand filters, is about 2 to 4 5 to 7 0.4 to 1.0 0.2 to 0.4 2 to 4 5 to 7 0.4 to 1.0 0.2 to 0.4 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is None of these Same Larger Smaller None of these Same Larger Smaller ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Scour valves are provided At street corners to control the flow of water At every summit of rising mains At every depression and dead ends to drain out the waste water that may collect there At the foot of rising main along the slope to prevent back running of water At street corners to control the flow of water At every summit of rising mains At every depression and dead ends to drain out the waste water that may collect there At the foot of rising main along the slope to prevent back running of water ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The water carriage system of collection of waste product All of these Is cheaper in initial cost than dry conservancy system Requires treatment before disposal Creates hygienic problem All of these Is cheaper in initial cost than dry conservancy system Requires treatment before disposal Creates hygienic problem ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The effect of increasing diameter of sewer on the self cleansing velocity is To decrease it Nil To increase it Fluctuating To decrease it Nil To increase it Fluctuating ANSWER DOWNLOAD EXAMIANS APP
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