ENVIRONMENTAL ENGINEERING QUIZ

The design discharge for the separate sewer system shall be taken as

6 × DWF

2 × DWF

Equal to dry weather flow (DWF)

3 × DWF

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YOUR ANSWER : ?

Standard BOD is measured at

20°C - 1 day

30°C - 5 day

25°C - 3 day

20°C - 5 day

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Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the

Hardness in water

Turbidity in water

Residual chlorine in water

Dissolved oxygen in water

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If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is (i) Presumptive coli-form test (ii) Confirmed coli-form test (iii) Completed coli-form test

Only (i)

Both (i) and (ii)

Both (i) and (iii)

All (i), (ii) and (iii)

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YOUR ANSWER : ?

The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

0.2 to 0.4

0.4 to 1.0

2 to 4

5 to 7

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YOUR ANSWER : ?

Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system?

Circle method

Equivalent pipe method

Electrical analysis method

Hardy cross method

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Sludge volume index is defined as the ratio of

Percentage of suspended solids by weight to percentage of sludge by volume

Percentage of total solids by weight to percentage of sludge by volume

Percentage of sludge by volume to percentage of suspended solids by weight

Percentage of sludge by volume to percentage of total solids by weight

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Scour valves are provided

At street corners to control the flow of water

At every summit of rising mains

At the foot of rising main along the slope to prevent back running of water

At every depression and dead ends to drain out the waste water that may collect there

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An egg shaped section of sewer

Is economical than circular section

Is easy to construct

Provides self cleansing velocity at low discharges

Is more stable than circular section

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As compared to geometrical increase method of forecasting population, arithmetical increase method gives

Higher value

Same value

Accurate value

Lesser value

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