Environmental Engineering The detention period in coagulation tanks is usually kept as 30 to 45 minutes 2 to 6 hours 1 to 2 minutes 2 to 6 days 30 to 45 minutes 2 to 6 hours 1 to 2 minutes 2 to 6 days ANSWER DOWNLOAD EXAMIANS APP
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 (i) and (ii) (ii) and (iii) (ii) and (iv) (i) and (iv) (i) and (ii) (ii) and (iii) (ii) and (iv) (i) and (iv) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The maximum permissible limit for fluoride in drinking water is 0.1 mg/liter 1.5 mg/liter 10 mg/liter 5 mg/liter 0.1 mg/liter 1.5 mg/liter 10 mg/liter 5 mg/liter ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering An egg shaped section of sewer Is easy to construct Provides self cleansing velocity at low discharges Is economical than circular section Is more stable than circular section Is easy to construct Provides self cleansing velocity at low discharges Is economical than circular section Is more stable than circular section ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The rate of Alteration of pressure filters is Less than that of slow sand filters Equal to that of slow sand filters Greater than that of rapid sand filters In between the filtration rate of slow sand filters and rapid sand filters Less than that of slow sand filters Equal to that of slow sand filters Greater than that of rapid sand filters In between the filtration rate of slow sand filters and rapid sand filters ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by TOD > COD > BOD TOD > BOD > COD BOD > COD > TOD COD > BOD > TOD TOD > COD > BOD TOD > BOD > COD BOD > COD > TOD COD > BOD > TOD ANSWER DOWNLOAD EXAMIANS APP
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