Q.1
In pressure supply mains, water hammer pressure is reduced by providing
Q.2
In centrifugal pump installation,
Q.3
Pick up the correct statement from the following:
Q.4
Surge tanks are used
Q.5
According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for
Q.6
If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is
Q.7

The least thickness of class B cast iron (spun) pipe, is

  • 7.2 mm
  • 7.9 mm
  • 8.6 mm
  • 10 mm.
Q.8

Most commonly used pump for lifting water in water supply mains, is

  • axialflow pump
  • reciprocating pump
  • rotary type pump
  • centrifugal pumps
  • none of these.
Q.9

According to IS : 1172-a minimum oflitres of water capita per day, is required for

  • Boarding schools
  • Nurses home and medical quarters
  • hostels
  • all the above.
Q.10

Economic height of a dam is the height corresponding to which

  • cost of the dam per unit of storage is minimum
  • amount of silting is less
  • cost of dam per unit storage is maximum
  • free board provided is least
  • none of these.
Q.11

The R.L. of ground water table on the sides of a valley ism whereas R.L. of the stream water ism. Ifslope consists of pervious soil between R.L.m tom, the gravity spring may be expected at the point of reduced level

  • 1500 m
  • 1505 m
  • 1475 m
  • 1485 m.
Q.12

Distribution mains of any water supply, is normally designed for its average daily requirement

  • 100%
  • 150%
  • 200%
  • 225%.
Q.13

Water supply system includes

  • digging a well for water
  • construction of dams
  • construction of canals
  • entire arrangement from source to distribution.
Q.14

The factor affecting per capita demand, is

  • size of the city
  • climatic conditions
  • pressure in water mains
  • cost of water
  • all the above.
Q.15

If pH value of water is

  • 7 water it is said to be neutral
  • less than 7 it is said to be acidic
  • more than 7 it is said to be alkaline
  • all the above.
Q.16

Corrosion of a pipe

  • reduces its life span
  • reduces its carrying capacity
  • adds colour to water
  • adds odour to water
  • all the above.
Q.17

Pick up the incorrect statement from the following. The underground sources of water, is from

  • wells
  • springs
  • infiltration wells
  • storage reservoirs
  • none of these.
Q.18

In pressure supply mains, water hammer pressure is reduced by providing

  • sluice valves
  • air valves
  • pressure relief valves
  • none of the these.
Q.19

Pick up the correct statement from the following :

  • Detention period for plain sedimentation tanks ranges between 4 to 8 hours
  • Detention period for sedimentation tanks, using coagulants usually ranges between 2 to 4 hours
  • The horizontally flow velocity in sedimentation tanks, is generally limited to 0.3 m/minute
  • All the above.
Q.20

Pick up the correct statement from the following :

  • Detention period for plain sedimentation tanks ranges between 4 to 8 hours
  • Detention period for sedimentation tanks, using coagulants usually ranges between 2 to 4 hours
  • The horizontally flow velocity in sedimentation tanks, is generally limited to 0.3 m/minute
  • All the above.
Q.21

Pick up the correct statement from the following :

  • Detention period for plain sedimentation tanks ranges between 4 to 8 hours
  • Detention period for sedimentation tanks, using coagulants usually ranges between 2 to 4 hours
  • The horizontally flow velocity in sedimentation tanks, is generally limited to 0.3 m/minute
  • All the above.
Q.22

Disinfection of drinking water, is done to remove

  • turbidity
  • odour
  • bacterias
  • colour.
Q.23

Sunlight

  • helps growth of bacterias
  • impedes growth of algae
  • increases dissolved oxygen content
  • reduces turbidity.
Q.24

Manholes along the mains from the source to a city are provided atm intervals in

  • steel pipes
  • R.C.C. pipes
  • hume steel pipes
  • all the above.
Q.25

Asbestos pipes are

  • light in weight and easy to transport
  • highly resistant to corrosion
  • high flexible to accommodate deflection upto 12°
  • very much smooth and hydraulically efficient
  • all the above.
Q.26

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
  • 2.75 m
  • 3.00 m.
Q.27

The population growth curve is

  • S-shaped curve
  • parabolic curve
  • circular curve
  • straight line
  • none of these.
Q.28

The maximum depth of sedimentation tanks is limited to

  • 2 m
  • 3 m
  • 4 m
  • 5 m
  • 6 m.
Q.29

Average annual rainfall at any station is the average of annual rainfall over a period of

  • 7 years
  • 14 years
  • 21 years
  • 28 years
  • 35 years.
Q.30

The transitional middle portion of a logistic curve follows

  • a geometric growth
  • a logarithmic growth
  • a first over curve
  • a constant rate.
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