Q.1

The ratio of maximum hourly consumption and average hourly consumption of the maximum day, is

  • 1.2
  • 1.5
  • 1.8
  • 2.4
  • 2.7
Q.2

The ratio of the maximum daily consumption to the average daily demand, is

  • 1.0
  • 1.2
  • 1.4
  • 1.6
  • 1.8
Q.3

Dead storage of a reservoir of Q capacity generally provided for silt deposition during its life time, is generally kept

  • 1/8th Q
  • 1/6th Q
  • 1/5th Q
  • 1/4th Q
  • 1/3rd Q.
Q.4

Water gets evaporated from water surfaces and land surfaces, get converted into water drops at lower temperatures, flows over ground surface and finally meets its source, i.e. lake, sea, etc. This entire process is generally known as

  • hydrological cycle
  • water cycle
  • evaporation and precipitation cycle
  • all the above.
Q.5

The four major water supply distribution systems, are

  • dead end, tree, grid iron and reticulation
  • dead end, tree, grid iron and circular
  • tree, grid iron, ring and radial
  • tree, reticulation, circular and ring.
Q.6

Pick up the correct statement from the following :

  • Lime may be used to soften the hard water
  • Excessive use of lime may kill the bacterias
  • Excessive lime when added to water, raises its pH value
  • When lime raises pH value of water to about 9.5, 100% bacterias are removed
  • All the above.
Q.7

Pick up the correct statement from the following :

  • Water with hardness upto 75 ppm is considered soft
  • Water with hardness more than 200 ppm is considered hard
  • Water needed for laundaries should contain hardness less than 75 ppm
  • To provide taste during drinking, water should possess hardness between 75 to 120
  • All the above.
Q.8

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 foot valve fitted at the bottom end of the suction pipe, prevents the movement of water from the pump when it is stopped
  • the motor may burn out if it is started with empty delivery pipe and with open gate valve
  • all the above.
Q.9

Cast iron pipes are generally preferred to, because

  • of moderate cost
  • of ease to join
  • of durability
  • of longer life
  • all the above.
Q.10

The ratio of discharge and plan area of a continuous flow type settling tank, is known

  • surface loading
  • overflow
  • overflow rate
  • all the above.
Q.11

If the specific capacity of a well is 0.x 10-3 per sec, the discharge from a well of 4 m diameter under a depression head of 4 m, is

  • 8 litres/sec
  • 10 litres/sec
  • 12 litres/sec
  • 14 litres/sec
  • 16 litres/sec.
Q.12

Most important source of water for public water supply, is from

  • lakes
  • ponds
  • streams
  • rivers
  • sea.
Q.13

Specific capacity or yield of wells, is generally expressed, as

  • m3 per sec
  • m3/hour
  • m3/hour/m2
  • m3/hour/m2/m
  • m3/hour/m2/sec.
Q.14

Pipes are laid parallel

  • to increase the capacity of the water supply
  • to provide a means of repairing without closing water supply
  • to meet the requirement of excessive supply
  • all the above.
Q.15

Pick up the correct statement from the following :

  • At a particular speed of operation, the head produced decreases with the increase of discharge
  • At zero discharge, discharge valve remaining closed, the head developed is maximum which is known as shut-off head
  • At a particular speed the discharge at which efficiency of a pump is maximum, is known as normal discharge
  • The brake horse power required from the primemover to drive the pump, increases with the increase of discharge
  • all the above.
Q.16

The factor to be considered for the source of city water supply, is

  • quantity and quality of the available water
  • elevation of the source of water
  • general terrain intervening the area
  • all the above.
Q.17

Pick up the wrong nominal internal diameter of cast iron (spun) pipes in mm from the following :

  • 300
  • 400
  • 500
  • 550
  • 600
Q.18

Maximum permissible colour for domestic water supplies, based on Cobalt scale, is

  • 5 P.P.M.
  • 10 P.P.M.
  • 15 P.P.M.
  • 20 P.P.M.
  • 25 P.P.M.
Q.19

The chlorine supply cylinders are generally kept at 38°C to 40°C to prevent

  • conversion into crystals
  • it from burning
  • it from explosion
  • none of these.
Q.20

The population of a city inisThe average per decade of the previous records of population isand average percentage per decade is 20%. The population of the city based on geometrical increase method, in the yearwill be

  • 56, 000
  • 60, 000
  • 64, 000
  • 70, 000
  • 72, 000
Q.21

Normal values of overflow rate for plain sedimentation tank using coagulants, is

  • 750 to 1000 litres/hr/m2
  • 1000 to 1250 litres/hr/m2
  • 1250 to 1500 litres/hr/m2
  • 1500 litres/hr/m2.
Q.22

The maximum pressure to which a pipe is subjected to during its operation, is known

  • working pressure
  • design pressure
  • test pressure
  • pipe pressure
  • all the above.
Q.23

Pick up the correct statement from the following :

  • Domestic use of water is 50% of total consumption
  • Average consumption of commercial use of water is 25% of total consumption
  • Consumption of water on public use is 10% of total consumption
  • Waste water and leakage is 15% of total consumption
  • all the above.
Q.24

Hardness of water can be removed by boiling if it is due to

  • calcium bicarbonates
  • calcium sulphates
  • calcium chloride
  • calcium nitrates.
Q.25

Most important source of water for public water supply, is from

  • lakes
  • ponds
  • streams
  • rivers
  • sea.
Q.26

The capability of a soil mass of full width and depth to transmit water, is known

  • porosity
  • permeability
  • transmissibility
  • none of these.
Q.27

Cast iron pipes are generally preferred to, because

  • of moderate cost
  • of ease to join
  • of durability
  • of longer life
  • all the above.
Q.28

The formula Q = P - K[1.8T +in which Q is runoff, P is annual rain fall in cm, T is mean annual temperature in centigrades and K is a constant, is known

  • Justin's formula
  • Khosla's formula
  • English formula
  • Vermule's formula.
Q.29

To control the growth of algae in reservoirs, the compound which is used, is

  • bleaching powder
  • copper sulphate
  • lime solution
  • alum solution
  • all the above.
Q.30

Yield of a drainage basin is :

  • run off of the area expressed as instantaneous rate
  • average run off over a short period
  • total volume of water flowing annually
  • all the above.
0 h : 0 m : 1 s