WASTE WATER ENGINEERING QUIZ

In sewers the highest non-scouring velocity is achieved in

Cement concrete sewers

Glazed bricks sewers

Stone ware sewers

Cast iron sewers

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Antisyphonage pipe is fitted

With a W.'trap

At the end of septic tanks

At the beginning of sewer line

On manholes

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To maintain aerobic biological activity, the moisture content of the compost mass should be about

0.5

0.45

0.55

0.6

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In trickling filter, B.O.D. is reduced to

80 to 90%

40 to 60%

60 to 80%

30 to 40%

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Before discharging the foul sewage into rivers, it is generally treated by

Screening

Oxidation

Sedimentation

All listed here

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The most widely used pump for lifting sewage is

Centrifugal pump

Air pressure pump

Reciprocating pump

Pneumatic ejector

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In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

[(100 + P2)/(100 – P1)] V1

[(100 – P1)/(100 – P2)] V1

[(100 + P1)/(100 – P2)] V1

[(100 – P1)/(100 + P2)] V1

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In normal conditions, the period for sludge digestion, is

30 days

20 days

60 days

10 days

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Fresh sewage may become stale in

Three to four hours

One hour

Two to three hours

Six hours

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For large sewers, maximum distance between manholes may be

300 m

50 m

100 m

200 m

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