Environmental Engineering The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of 10 mg/liter 1 mg/liter 100 mg/liter 1000 mg/liter 10 mg/liter 1 mg/liter 100 mg/liter 1000 mg/liter ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Settling velocity increases with Temperature of liquid Depth of tank Specific gravity of solid particles Size of particles Temperature of liquid Depth of tank Specific gravity of solid particles Size of particles ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The detention period in coagulation tanks is usually kept as 30 to 45 minutes 1 to 2 minutes 2 to 6 days 2 to 6 hours 30 to 45 minutes 1 to 2 minutes 2 to 6 days 2 to 6 hours 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 > BOD > COD TOD > COD > BOD BOD > COD > TOD COD > BOD > TOD TOD > BOD > COD TOD > COD > BOD BOD > COD > TOD COD > BOD > TOD ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The process in which the chlorination is done beyond the break point is known as Super chlorination Pre-chlorination Break point chlorination Post chlorination Super chlorination Pre-chlorination Break point chlorination Post chlorination ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Hardy cross method of analysis of distribution system (i) Involves successive trials (ii) Takes economic aspects into account (iii) Is time consuming (i) and (iii) All are correct (i) and (ii) Only (i) (i) and (iii) All are correct (i) and (ii) Only (i) ANSWER DOWNLOAD EXAMIANS APP
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