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Water Supply Engineering problems

3. A circular gravity aqueduct is not generally preferred to because of
Options
A. its maximum hydraulic mean depth
B. maximum area per unit of wetted perimeter
C. minimum cost of construction
D. its proper support on the ground.

4. An aquiclude is
Options
A. a non artesian aquifer
B. an artesian acquifer
C. a confined bed of impervious material between acquifers
D. a large water body under ground.

5. Pick up the incorrect statement from the following :
Options
A. The net amount of water which joins the surface streams in a catchment, is known as surface run-off
B. The amount of water which joins the stream from the underground water, is called base flow
C. The yearly run off in cm depth over the catchment, is termed as the yield of the drainage basin
D. The yield of drainage in cm depth multiplied by the area of the catchment gives the annual volume of water
E. None of these.

6. In an artesian acquifer, the draw downs in two observation wells at distances 100 m, and 200 m were found same after one hour and x hours respectively. The value of x, is
Options
A. 2 hours
B. 4 hours
C. 9 hours
D. 16 hours.

7. Reciprocating pumps
Options
A. are not suitable for variable heads
B. are four times costlier than centrifugal pumps
C. are not suitable for pumping water containing sediments
D. single stroke produce pulsating flow
E. none of these.

8. Specific yield of a well is
Options
A. quantity of water than can be drawn from the well
B. flow of water per unit time
C. total quantity of water available in the well
D. quantity of water per unit time per unit draw-down.

9. Chemical coagulation of drinking water, is done
Options
A. to settle suspended materials
B. to increase rate of settlement of suspended materials
C. to remove the bacterias
D. none of these.

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