Civil Engineering - Waste Water Engineering

Exercise :: Waste Water Engineering - Section 5

41.

The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

 A. 213.5 cm/sec B. 313.5 cm/sec C. 413.5 cm/sec D. 500 cm/sec.

Explanation:

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42.

If γw is the unit weight of water, r the hydraulic mean depth of the sewer and S the bed slope of the sewer, then the tractive force exerted by flowing water, is

 A. γw . r . S B. γw r1/2 . S C. γw r S D. γw r2/3 S

Explanation:

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43.

In detritus tanks,

 A. flow velocity is kept 0.09 m/sec B. detention period is kept 3 to 4 minutes C. organic and inorganic materials are separated D. all the above.

Explanation:

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44.

The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is

 A. 5 m B. 5.5 m C. 6 m D. 6.5 m E. 7 m.

Explanation:

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45.

In areas where rainy season is limited to a few months, the type of sewerage system recommended is

 A. combined system B. partially separate system C. separate system D. none of these.