To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of_______________?
A. Hydrochloric acid
B. Sulphuric acid
C. Nitric acid
D. Citric acid
A. Hydrochloric acid
B. Sulphuric acid
C. Nitric acid
D. Citric acid
A. House sewer
B. Out-fall sewer
C. Branch sewer
D. Main sewer
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen
A. Carbondioxide
B. Hydrogen sulphide
C. Methane
D. All of these
The gas evolved in sewers is________________? Read More »
Civil Engineering Mcqs, Waste Water Engineering A. 100 to 500
B. 500 to 1000
C. 1000 to 1500
D. 1500 to 2000
In sewage, the solids in mg per litre is__________________? Read More »
Civil Engineering Mcqs, Waste Water Engineering A. D²
B. D²
C. D²
D. D²
A. Flushing
B. Cane rodding
C. Wooden pills
D. None of these
The small sewers are cleaned by____________________? Read More »
Civil Engineering Mcqs, Waste Water Engineering A. Hydrogen sulphide (H2S)
B. Carbon dioxide (CO2)
C. Methane (CH4)
D. All the above
In sewers the gas generally found, is_________________? Read More »
Civil Engineering Mcqs, Waste Water Engineering A. 1/3
B. 0/2
C. 0/3
D. 2 /3
A. More than the rate of water supply
B. Equal to the rate of water supply
C. Less than the rate of water supply
D. At 150 litres per capita
Rate of flow of sewage is generally assumed__________________? Read More »
Civil Engineering Mcqs, Waste Water Engineering