Water Supply and Engineering MCQ Test - Set 04 - ObjectiveBooks

# Practice Test: Question Set - 04

1. Rapid gravity filters
(A) Were developed by G.W. Fuller
(B) Make use of coarser sand with effective size as 0.5 mm
(C) Yield as high as 30 times the yield of slow sand filters
(D) All the above

2. For 3.25 × 10-2 cumecs discharging from a well, a pump is installed to lift water against a total head of 30 m. The minimum required horse power, is
(A) 10 H.P.
(B) 15 H.P.
(C) 18 H.P.
(D) 20 H.P.

3. Distribution mains of any water supply, is normally designed for its average daily requirement
(A) 100 %
(B) 150 %
(C) 200 %
(D) 225 %

4. Maximum threshold number permitted for indicating the odour of public water supplies, is
(A) 1
(B) 2
(C) 3
(D) 4

5. The rate of silting in a reservoir
(A) Is less in the beginning
(B) Remains constant throughout
(C) Is more in the beginning
(D) Is more in the beginning and reduces in the end

6. Corrosion of well pipes may not be reduced by
(A) Reducing the draw down and the pumping rate
(B) Reducing the flow velocity
(C) Using thicker pipes
(D) Using screens having larger area of openings

7. Recuperation test is carried out to determine
(A) Turbidity of water
(B) pH value of water
(C) Yield of well
(D) Discharge from a well

8. Pick up the correct statement from the following:
(A) Large solids carried along the river bed, is known as bed load
(B) The fine sediment deposits are generally near the face of the dam
(C) Deposition of sediment in the reservoir, reduces the capacity of the reservoir
(D) All the above

9. Pick up the incorrect statement from the following. The underground sources of water, is from
(A) Wells
(B) Springs
(C) Infiltration wells
(D) Storage reservoirs

10. Pick up the correct statement from the following:
(A) Domestic use of water is 50% of total consumption
(B) Average consumption of commercial use of water is 25% of total consumption
(C) Waste water and leakage is 15% of total consumption
(D) All the above

11. Most important method for calculating discharge for planning a water supply project, is
(A) Velocity area method
(B) Weir or spillway method
(C) Use of venturi-meter
(D) Using power plant consumption

12. Pick up the correct statement from the following:
(A) The internal pressure within a pipe, is caused due to water head and hammer pressure
(B) In pressure pipes with water at rest, the pressure is equal to water head
(C) Sudden closure of a valve, causes the water hammer pressure
(D) All the above

13. Pickup the incorrect statement from the following:
(A) The invert of pressure conduit is independent of the grade of the hydraulic gradient line
(B) The pressure conduits may be taken uphill upto a maximum height of 8.3 m
(C) Aqueducts and tunnels sections are generally kept circular
(D) None of these

14. Pick up the correct statement from the following:
(A) The ratio of the total sediment deposited in the reservoir to the total sediment flowing in the river, is called trap efficiency
(B) Small capacity reservoirs on large rivers generally, silt less
(C) Large capacity reservoirs on small rivers generally silt more
(D) All the above

15. Gravity conduits for carrying water from the source are
(A) Canals
(B) Flumes
(C) Aqueducts
(D) All the above

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