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.Management Sciences
Category: Environmental Engineering
If the sewage contains grease and fatty oils, these are removed in_________________?
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A. grit chambers
B. detritus tanks
C. skimming tanks
D. sedimentation tanks
Which of the following compounds is widely used for algae control ?
A. sodium sulphate
B. copper sulphate
C. sodium chloride
D. calcium chloride
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?
A. TOD>BOD>COD
B. TOD>COD>BOD
C. BOD>COD>TOD
D. COD>BOD>TOD
A sewer that receives the discharge of a number of house sewers is called________________?
A. house sewer
B. lateral sewer
C. intercepting sewer
D. submain sewer
In water treatment, rapid gravity filters are adopted to remove_______________?
A. dissolved organic substances
B. dissolved solids and dissolved gases
C. floating solids and dissolved inorganic solids
D. bacteria and colloidal solids
Which of the following sewers is preferred for combined system of sewage ?
A. circular sewer
B. egg shaped sewer
C. rectangular sewer
D. none of the above
A pipe which is installed in the house drainage to preserve the water seal of traps is called______________?
A. vent pipe
B. antisiphonage pipe
C. waste pipe
D. soil pipe
The distribution mains are designed for________________?
A. maximum daily demand
B. maximum hourly demand
C. average daily demand
D. maximum hourly demand on maxi¬mum day
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