# Civil Engineering - Waste Water Engineering

Exercise : Waste Water Engineering - Section 5
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
πD8/3 = 4 b8/3
πD3/8 = 4 b3/8
πD2/3 = 4 b2/3
πD3/2 = 4 b3/2
none of these.
Explanation:
No answer description is available. Let's discuss.

12.
For detecting the nitrites in the sewage, the matching colour may be developed by adding
Pottassium permanganate
Sulphuric acid and napthamine
Phenol-di-sulphuric acid pottassium hydroxide
None of these.
Explanation:
No answer description is available. Let's discuss.

13.
The suitable cross-section of sewers to carry combined flow, is
circular
egg shaped
rectangular
horse shoe shaped.
Explanation:
No answer description is available. Let's discuss.

14.
Hazin's formula is used for the settlement velocity of the particles of diameter
less than 0.01 mm
less than 0.05 mm
less than 0.1 mm
greater than 0.1 mm.