Civil Engineering - Waste Water Engineering

36. 

Flocculated particles do not change their

A. size
B. shape
C. weight
D. none of these.

Answer: Option D

Explanation:

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37. 

For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

A. cast iron sewers
B. cement concrete sewers
C. glazed bricks sewers
D. stone ware sewers.

Answer: Option C

Explanation:

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38. 

Disposal to sewage in large cities, is done in

A. irrigation
B. dilution
C. oxidation
D. putrifaction.

Answer: Option B

Explanation:

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39. 

For the COD test of sewage, organic matter is oxidised by K2Cr207 in the presence of

A. H2SO4
B. HNO3
C. HCl
D. none of these.

Answer: Option A

Explanation:

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40. 

In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

A. 10.0
B. 5.0
C. 2.0
D. 0.25

Answer: Option D

Explanation:

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