Civil Engineering - Waste Water Engineering

26. 

If the grit in grit chambers is 4.5 million litres per day, its cleaning is done

A. manually
B. mechanically
C. hydraulically
D. electrically.

Answer: Option A

Explanation:

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27. 

The gas evolved in sewers is

A. Carbondioxide
B. Hydrogen sulphide
C. Methane
D. All of these.

Answer: Option D

Explanation:

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28. 

The maximum depth of sedimentation tanks, is kept

A. 3 m
B. 3.5 m
C. 4 m
D. 4.5 m.

Answer: Option A

Explanation:

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29. 

The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

A. 1 in 100 upward
B. 1 in 500 upward
C. 1 in 100 downward
D. 1 in 503 upward.

Answer: Option C

Explanation:

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30. 

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

A. a particle to travel along its length
B. a particle to travel from top surface to bottom sludge zone
C. the flow of sewage to fill the tank
D. none of these.

Answer: Option C

Explanation:

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