5 days-biochemical oxygen demand (BOD5) is taken at a temperature of_________________?
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of_________________?
A. 0°C
B. 15°C
C. 20°C
D. 25°C
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The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________?
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________?A. 30 minutes
B. 1 hour
C. 1 hour and 30 minutes
D. 2 hoursThe suitable cross-section of sewers to carry combined flow, is__________________?
The suitable cross-section of sewers to carry combined flow, is__________________?A. Circular
B. Egg shaped
C. Rectangular
D. Horse shoe shapedIn the activated sludge process__________________?
In the activated sludge process__________________?A. Aeration is continued till stability
B. Aeration is done with an admixture of previously aerated sludge
C. Sludge is activated by constant stirring
D. Water is removed by centrifugal actionThe asbestos cement sewers are_________________?
The asbestos cement sewers are_________________?A. Light in weight
B. Not structurally strong to bear large compressive stress
C. Susceptible to corrosion by sulphuric acid
D. All the aboveIf the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is________________?
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is________________?A. 2 hours
B. 3 hours
C. 4 hours
D. 5 hoursThe specific weight of water is 1000 kg/m” _______________?
The specific weight of water is 1000 kg/m” _______________?A. at norma] pressure of 760 mm
B. at 4°C temperature
C. at mean sea level
D. all the above
E. none of the above.