Q.1
Sluice valves are fitted in a distribution system
  • along straight length of pipes at suitable intervals
  • at the junctions of the pipes
  • at the branching off points of sub-mains
  • all the above.
Q.2
For centrifugal pumps
  • initial cost is low
  • limited space is required
  • the discharge obtained is steady and non-pulsating
  • all the above.
Q.3
The prescribed hardness limit of potable water ranges between
  • 50 to 75 P.P.M.
  • 75 to 115 P.P.M.
  • 150 to 200 P.P.M.
  • none of these.
Q.4
How much is 1 decade
  • 1 year
  • 10 years
  • 100 years
  • 1000 years
Q.5
Corrosion of well pipes may not be reduced by
  • reducing the draw down and the pumping rate
  • reducing the flow velocity
  • using thicker pipes
  • using screens having larger area of openings
Q.6
Average annual rainfall at any station is the average of annual rainfall over a period of
  • 14 years
  • 21 years
  • 28 years
  • 35 years
Q.7
Gravity conduits for carrying water from the source are
  • canals
  • flumes
  • acqueducts
  • all the above.
Q.8
Water losses in water supply, is assumed as
  • 0.075
  • 0.1
  • 0.225
  • 15%.
Q.9
Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be
  • nil
  • 5
  • 10
  • 15
Q.10
Gravity conduits are generally in the form of
  • canals
  • flumes
  • aqueduct
  • all the above.
Q.11
Which of the following instrument is used to measure turbidity?
  • Olfactometer
  • Turbidity meter
  • Colorimeter
  • Spectrophotometer
Q.12
At the socket and spigot joint,
  • enlarged end of the pipe is called socket
  • normal end of the pipe is called spigot
  • spigot is fitted into the socket
  • all the above.
Q.13
Which of the following represents the physical characteristics of water?
  • Chloride content
  • BOD
  • Turbidity
  • COD
Q.14
The process of passing water through beds of granular materials, is called
  • Screening
  • Sedimentation
  • Filtration
  • None of these
Q.15
Pick up the incorrect statement from the following. The underground sources of water, is from
  • wells
  • springs
  • infiltration wells
  • storage reservoirs
Q.16
While determining the yield of open wells by the pumping test
  • Velocity of recharging water, increases with depression head
  • Depression head resulting at critical velocity, is called critical depression head
  • Working head is generally limited to ?rd of the critical depression head
  • Maximum safe yield of an open well, is expected at critical depression head
Q.17
The specific retention is least in case of
  • Clay
  • Sand
  • Silt
  • Coarse gravel.
Q.18
The fire demand of a city may be worked out by
  • Kuichling’s formula
  • Freeman formula
  • Bustan’s formula
  • All the above
Q.19
In centrifugal pump installation,
  • Pump is properly primed before starting
  • The diameter of the pipe at inlet as well as at outlet, is kept smaller than the delivery pipe
  • The motor may burn out if it is started with empty delivery pipe and with open gate valve
  • All the above
Q.20
The expected discharge to be obtained from an open well sunk in coarse sand is 0.cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is
  • 2 m
  • 2.25 m
  • 2.50 m
  • 3.00 m
Q.21
If the chosen diameter of a pipe, is less than the economical diameter
  • Cost of pipe will be less
  • Head loss will be high
  • Cost of pumping will be more than saving
  • All the above
Q.22
Specific capacity or yield of wells, is generally expressed, as
  • m³/sec
  • m³/hour
  • m³/hour/m²
  • m³/hour/m²/m
Q.23
The least thickness of class B cast iron (spun) pipe, is
  • 7.2 mm
  • 7.9 mm
  • 8.6 mm
  • 10 mm
Q.24
Surcharge storage zone of a reservoir, is
  • Below dead storage
  • Between dead storage and useful storage
  • Above useful storage
  • Also known as valley storage
Q.25
To pump water from a water reservoir 3 m deep and maximum water level atm, a pump is installed to lift water up to R.L.m at a constant rate of 36,00,litres per hour. If the length of the pipe ism and f = 0.ignoring other minor losses and assuming the economical diameter from Lea's formula D = 1.2 √Q, the water horse power of the pump is
  • 400
  • 450
  • 500
  • 600
Q.26
The factor affecting per capita demand, is
  • size of the city
  • climatic conditions
  • cost of water
  • all the above
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