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 Both (i) and (ii) Only (iii) Only (i) Both (i) and (iii) Both (i) and (ii) Only (iii) Only (i) Both (i) and (iii) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The process in which the chlorination is done beyond the break point is known as Break point chlorination Pre-chlorination Super chlorination Post chlorination Break point chlorination Pre-chlorination Super chlorination Post chlorination ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be 400 ppm 100 ppm 300 ppm 200 ppm 400 ppm 100 ppm 300 ppm 200 ppm ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Scour valves are provided 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 At street corners to control the flow of water At every summit of rising mains ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The rate of Alteration of pressure filters is Less than that of slow sand filters In between the filtration rate of slow sand filters and rapid sand filters Greater than that of rapid sand filters Equal to that of slow sand filters Less than that of slow sand filters In between the filtration rate of slow sand filters and rapid sand filters Greater than that of rapid sand filters Equal to that of slow sand filters ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The effect of increasing diameter of sewer on the self cleansing velocity is Fluctuating To increase it Nil To decrease it Fluctuating To increase it Nil To decrease it ANSWER DOWNLOAD EXAMIANS APP
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