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For a town with population 40,000, the average daily demand is 200 litres/capita/day
and five demand is 4000 litres/minute. The peak demand is

A) 27.36 Million litres/day B) 20.16 Million litres/day
C) 21.60 Million litres/day D) 37.92 Million litres/day
Rotary pumps are classified under

A) Impulse pumps B) Displacement pumps
C) Reciprocating pumps D) Centrifugal pumps

A centrifugal pump is required to lift 1.5 cubic metres of water per second to a height
of 7 metres. If total losses in the pipes is 0.5 metres, the minimum HP of the driving
engine to run the pump is (Assume efficiency 60%)

A) 300 HP B) 200 HP C) 250 HP D) 150 HP

A continuous flow settling tank has the following parameters :
Length of settling zone = L

Depth of water in settling zone = H

Horizontal velocity of flow of water = V

Settling velocity of particle = ५/९

The condition for a particle to enter the sludge zone is

a) bot ‏لا و‎ ೦ ಬಾಗ ட்‌.
VV, ५/ Vs Vs ४ Vs ४
The coagulant which can be used for treating water to be used in boilers is
A) Ferric chloride B) Alum C) Ferric sulphate D) Sodium aluminate

The proportionate depth for a sewer of diameter ‘D’ running partially full at depth "0'
and having ‘o’ as central angle in degrees is

A) (ஸதி B) 3 (1-se0%) 0) 2(1- தி D) 3 (1-cos%4)

25 ml of sewage is diluted to 250 ml. DO concentration of diluted sample at the
beginning of BOD test was 8 mg/l and 6 mg/l after 5 days incubation at 20°C. The
corresponding DO values for the dilution water were 8.2 mg/l and 8 mg/l. The BOD
of the sewage is

A) 18.2 mg/l 8) 20 mg/l C) 182 mg/l D) 200 ‏اوہہ‎
‎Dumping is avoided as a disposal method when screenings are from

A) Medium and coarse screens B) Coarse screens

C) Screens with shredders D) Medium and fine screens

A circular trickling filter is treating 5 Million litres of sewage per day. The BOD is
100 mg/l. The organic loading rate is 1000 kg/hectare metre/day. The hydraulic
loading rate is 25 Million litres/hectare/day. The effective depth of filter is

A) 2m B) 25m C) 1.5m D) 2.2m
Highly stable atmosphere occurs when lapse rate is
A) isothermal B) normal C) adiabatic D) negative

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