Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be________________?
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 valvesD. 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 yearsE. 35 years
Sunlight_________________ ?
Sunlight_________________ ? A. helps growth of bacteriasB. 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 timesD. 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 formulaE. All the above.