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Waste Water Engineering

Waste Water Engineering
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is

40 cm
50 cm
20 cm
25 cm

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.01 mm
Greater than 0.1 mm
Less than 0.1 mm
Less than 0.05 mm

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Waste Water Engineering
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

100
10000
1000
5000

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Waste Water Engineering
A sewer running partially full and hurried with back filled, fails in compression due to

Weight of the pipe
All listed here
Weight of the back fill
Superimposed traffic loads

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Waste Water Engineering
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called

A heap
None of these
Plateau
Windrow

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Waste Water Engineering
The minimum diameter of a sewer is kept

20 cm
25 cm
10 cm
15 cm

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