Civil Engineering - Waste Water Engineering

11. 

D is the diameter of a circular sewer and α is the side of a square section sewer. If both are hydraulically equivalent, the relationship which holds good, is

A. πD8/3 = 4 b8/3
B. πD3/8 = 4 b3/8
C. πD2/3 = 4 b2/3
D. πD3/2 = 4 b3/2
E. none of these.

Answer: Option A

Explanation:

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12. 

For detecting the nitrites in the sewage, the matching colour may be developed by adding

A. Pottassium permanganate
B. Sulphuric acid and napthamine
C. Phenol-di-sulphuric acid pottassium hydroxide
D. None of these.

Answer: Option B

Explanation:

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13. 

The suitable cross-section of sewers to carry combined flow, is

A. circular
B. egg shaped
C. rectangular
D. horse shoe shaped.

Answer: Option B

Explanation:

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14. 

Hazin's formula is used for the settlement velocity of the particles of diameter

A. less than 0.01 mm
B. less than 0.05 mm
C. less than 0.1 mm
D. greater than 0.1 mm.

Answer: Option D

Explanation:

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15. 

If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity, is

A. 1 in 60
B. 1 in 100
C. 1 in 120
D. none of these.

Answer: Option A

Explanation:

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