Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be________________?
A. nil
B. 5
C. 10
D. 15
E. 20
Water Supply Engineering
Surge tanks are used_______________?
Surge tanks are used_______________?
A. for storage water
B. to increase the velocity in a pipeline
C. as overflow valves
D. to guard against water hammer
Average annual rainfall at any station is the average of annual rainfall over a period of________________?
Average annual rainfall at any station is the average of annual rainfall over a period of________________?
A. 7 years
B. 14 years
C. 21 years
D. 28 years
E. 35 years
Sunlight_________________ ?
Sunlight_________________ ?
A. helps growth of bacterias
B. impedes growth of algae
C. increases dissolved oxygen content
D. reduces turbidity
The yield of a rapid gravity filter as compared to that of slow sand filter, is__________________?
The yield of a rapid gravity filter as compared to that of slow sand filter, is__________________?
A. 10 times
B. 15 times
C. 20 times
D. 30 times
E. 35 times
The fire demand of a city may be worked out by _________________?
The fire demand of a city may be worked out by _________________?
A. Kuichling’s formula
B. Freeman formula
C. Under Writers formula
D. Bustan’s formula
E. All the above.