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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