Waste Water Engineering - Civil Engineering Questions and Answers

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Waste Water Engineering - section-8

Stone ware pipes are

A.

Highly resistant to sulphide corrosion

B.

Highly impervious

C.

Hydraulically efficient because of their smooth interior surface

D.

Especially suited to pressure pipes

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Pick up the correct statement from the following:

A.

The ratio of the quantity of the diluting water to that of the sewage, is known as dilution factor

B.

The automatic purification of polluted water, is known self purification phenomenon

C.

The photosynthesis is carried out in the presence of sun light

D.

All the above

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Pick up the correct statement from the following:

A.

The water supply pipes carry pure water free from solid particles

B.

The water supply pipes get clogged if flow velocity is less than self cleansing velocity

C.

The sewers may be carried up and down the hills and valleys

D.

The sewer pipes are generally laid along level hills

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An inverted siphon is designed generally for

A.

One pipe

B.

Two pipes

C.

Three pipes

D.

Four pipes

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In sewers the gas generally found, is

A.

Hydrogen sulphide (H₂S)

B.

Carbon dioxide (CO₂)

C.

Methane (CH₄)

D.

All the above

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Sewer ventilating columns are generally placed at

A.

Distances 150 m to 300 m

B.

Upper ends of branch sewers

C.

Every change in the size of sewers

D.

All the above

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The coagulant which is generally not used for treating the sewage, is

A.

Alum

B.

Ferric chloride

C.

Ferric sulphate

D.

Chlorinated coppers

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Pick up the correct statement from the following:

A.

Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers

B.

4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river

C.

Solubility of oxygen in sewage is 95% of that of distilled water

D.

All the above

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Pick up the correct statement from the following:

A.

In treated sewage, 4 ppm of D.O. is essential

B.

Only very fresh sewage contains some dissolved oxygen

C.

The solubility of oxygen in sewage is 95% that is in distilled water

D.

All the above

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For house drainage minimum gradient is

A.

1 in 60

B.

1 in 80

C.

1 in 10

D.

1 in 400

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