Aeration of water is done to remove______________?
Aeration of water is done to remove______________?
A. odour
B. colour
C. bacterias
D. hardness
E. turbidity
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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 hammerThe least thickness of class B cast iron (spun) pipe, is_________________?
The least thickness of class B cast iron (spun) pipe, is_________________?A. 7.2 mm
B. 7.9 mm
C. 8.6 mm
D. 10 mmCorrosion of well pipes may not be reduced by_________________?
Corrosion of well pipes may not be reduced by_________________?A. reducing the draw down and the pumg rate
B. reducing the flow velocity
C. using thicker pipes
D. using screens having larger area of openings
E. none of theseSunlight_________________ ?
Sunlight_________________ ?A. helps growth of bacterias
B. impedes growth of algae
C. increases dissolved oxygen content
D. reduces turbidityThe expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is________________?
The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is________________?A. 2 m
B. 2.25 m
C. 2.50 m
D. 2.75 m
E. 3.00 mTime of concentration________________?
Time of concentration________________?A. is the time taken, for precipitation
B. duration of rainfall.
C. time taken for all the ran off to reach the drain
D. time taken for the storm water to travel from the most remote point to the drain