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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