Practice Test: Question Set - 03
1. 'Shrouding' is essentially provided in
- (A) Strainer
type wells
- (B) Cavity
type wells
- (C) Slotted type
well
- (D) All
the above
2. The maximum permissible hardness for public supplies is
- (A) 95
mg/liter
- (B) 105 mg/liter
- (C) 115 mg/liter
- (D) 125 mg/liter
3. 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
4. The chlorine supply cylinders are generally kept at 38°C to 40°C to prevent
- (A) Conversion
into crystals
- (B) It from
burning
- (C) It from
explosion
- (D) None of
these
5. For calculation of economical diameter D of a pipe in meters for a discharge Q to be pumped in cumecs, Lea suggested the empirical formula
- (A) D =
0.22 √Q
- (B) D =
1.22 √Q
- (C) D =
2.22 √Q
- (D) D =
3.22 √Q
6. An earth formation which, although porous and capable of absorbing water does not provide an appreciable supply to wells, is known as
- (A) Aquifer
- (B) Aquiclude
- (C) Aquifuge
- (D) None
of these
7. Property of earth to allow water to pass through it, is known as
- (A) Perviousness
- (B) Porosity
- (C) Permeability
- (D) Transmissibility
8. Plain chlorination is used for water
- (A) Obtained
from clear lakes
- (B) Consumed
during emergencies
- (C) Supplies
to armies during war
- (D) All the
above
9. A city supply includes
- (A) Domestic
water demand
- (B) Industrial
and commercial water demands
- (C) Demand
for public uses and fire
- (D) All the
above
10. The pH value of water is kept slightly less than 7 so that hydrochloride ions may combine with ammonia ions to form
- (A) Mono-chloramine
(NHCl)
- (B) Di-chloramine
(NH2Cl)
- (C) Nitrogen tri-chloramine
(NCl3)
- (D) All the
above
11. Pick up the correct statement from the following:
- (A) Copper
pipes are highly resistant to acidic and alkaline water
- (B) Wrought iron
pipes are lighter than cast iron pipes
- (C) Wrought iron
pipes corrode quickly and are less durable
- (D) All
the above
12. Pick up the correct statement from the following:
- (A) A
hydrograph is a plot of discharge versus time
- (B) A
mass curve is a plot of accumulated flow versus time
- (C) The
mass curve continuously rises
- (D) All
the above
13. If L, B and D length, breadth and depth of water in a rectangular sedimentation tank of total discharge Q, the settling velocity, is
- (A) Q/H
- (B) Q/D
- (C) Q/(D
× B)
- (D) Q/(L
× B)
14. The difference in the reservoir level and the lowest point of the water mains is 180 m. The expected pressure due to water hammer is 7.5 kg/cm2 in a pressure conduit of diameter 1 m. Assuming the efficiency of the riveted joints of the pipe as 0.6 and minimum cover 3 mm for corrosion, the thickness of the pipe materials, is
- (A) 10 mm
- (B) 15 mm
- (C) 20 mm
- (D) 25 mm
15. If G is the specific gravity of particles of diameter d, the velocity of settlement V in still water at T°C, according to Stoke's law, is
- (A) V = 418 (G - 1) d² [(3T + 70)/100]
- (B) V = 418 (G - 1) d [(3T - 70)/100]
- (C) V = 418 (G - 1) d² [(2T + 70)/100]
- (D) V = 418 (G - 1) d4 [(3T + 70)/100]
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