Environmental Engineering The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by COD > BOD > TOD TOD > COD > BOD TOD > BOD > COD BOD > COD > TOD COD > BOD > TOD TOD > COD > BOD TOD > BOD > COD BOD > COD > TOD ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The detention period for oxidation ponds is usually kept as 10 to 15 days 48 hours 24 hours 3 months 10 to 15 days 48 hours 24 hours 3 months ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering In water treatment, rapid gravity filters are adopted to remove Dissolved organic substances Dissolved solids and dissolved gases Bacteria and colloidal solids Floating solids and dissolved inorganic solids Dissolved organic substances Dissolved solids and dissolved gases Bacteria and colloidal solids Floating solids and dissolved inorganic solids ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The gas from sludge digestion tank is mainly composed of Hydrogen sulphide Carbon dioxide Methane Nitrogen Hydrogen sulphide Carbon dioxide Methane Nitrogen ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The self cleansing velocity for all sewers in India is usually 1.5 m/sec to 2.0 m/sec 1.0 m/sec to 1.2 m/sec 3.0 m/sec to 3.5 m/sec Less than 1.0 m/sec 1.5 m/sec to 2.0 m/sec 1.0 m/sec to 1.2 m/sec 3.0 m/sec to 3.5 m/sec Less than 1.0 m/sec ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The alum, when added as a coagulant in water Increases pH value of water Decreases pH value of water Does not require alkalinity in water for flocculation Does not affect pH value of water Increases pH value of water Decreases pH value of water Does not require alkalinity in water for flocculation Does not affect pH value of water ANSWER DOWNLOAD EXAMIANS APP
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