Waste Water Engineering problems
- 1. The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning's formula, is given by
Options- A. Bazin
- B. Crimp and Bruge
- C. William-Hazen
- D. Kutter. Discuss
Correct Answer: Crimp and Bruge
- 2. Pick up the incorrect statement from the following for allowing workers to enter sewers
Options- A. The particular manhole and one manhole on up stream and one manhole on down stream should remain open for 30 minutes
- B. Proper tests for the presence of poisonous gases must be carried out
- C. The men entering the manhole should be advised to smoke in the sewer
- D. Warning signals should be erected
- E. None of these. Discuss
Correct Answer: The men entering the manhole should be advised to smoke in the sewer
- 3. In a grit chamber of a sewage treatment plant,
Options- A. flow velocity 0.15 m to 0.3 m/sec is kept
- B. depth of 0.9 m to 1.20 m is kept
- C. one minute of detention period is kept
- D. all the above. Discuss
Correct Answer: all the above.
- 4. The quantity of liquid waste which flows in sewers during the period of rainfall, is known
Options- A. sanitary sewage
- B. industrial waste
- C. storm sewage
- D. none of these. Discuss
Correct Answer: storm sewage
- 5. For detecting the nitrates in sewage, the colour may be developed by adding
Options- A. Pottassium permanganate
- B. Sulphuric acid and napthamine
- C. Phenol-di-sulphuric acid and pottassium hydroxide
- D. None of these. Discuss
Correct Answer: Phenol-di-sulphuric acid and pottassium hydroxide
- 6. The value of Chezy's constant
is used in
Options- A. Chezy's formula
- B. Bazin's formula
- C. Kutter's formula
- D. Manning's formula. Discuss
Correct Answer: Bazin's formula
- 7. 1000 kg of sewage contains
Options- A. 0.112 kg in suspension
- B. 0.112 kg in solution
- C. 0.225 kg in solution
- D. 0.450 kg in suspension
- E. both (a) and (c) of above. Discuss
Correct Answer: both (a) and (c) of above.
- 8. The disintegrating pump in which solid matter is broken up before passing out, is
Options- A. centrifugal pump
- B. reciprocating pump
- C. pneumatic ejector
- D. none of these. Discuss
Correct Answer: centrifugal pump
- 9. The most efficient cross-section of sewers in a combined sewerage system is
Options- A. parabolic
- B. circular
- C. rectangular
- D. new egged. Discuss
Correct Answer: circular
- 10. In a sludge tank, the gas mainly produced, is
Options- A. Oxygen
- B. Nitrogen
- C. Hydrogen
- D. Carbon dioxide
- E. Methane. Discuss
Correct Answer: Methane.
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