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Waste Water Engineering

Waste Water Engineering
Which one of the following resists hydrogen sulphide corrosion?

Asbestos cement
R.C.C.
Glazed stone wares
Glazed ware

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Waste Water Engineering
The sewer which transports the sewage to the point of treatment, is called

House sewer
Main sewer
Out-fall sewer
Branch sewer

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Waste Water Engineering
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is

400 mg/l
100 mg/l
300 mg/l
200 mg/l

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Waste Water Engineering
For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of

160 cm
100 cm
120 cm
140 cm

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Waste Water Engineering
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

Oxygen
Carbon dioxide
Methane
Hydrogen sulphide

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Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

A particle to travel from top surface to bottom sludge zone
A particle to travel along its length
None of these
The flow of sewage to fill the tank

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