Waste Water Engineering problems
- 1. The coagulant which is generally not used for treating the sewage, is
Options- A. alum
- B. ferric chloride
- C. ferric sulphate
- D. chlorinated copperas. Discuss
Correct Answer: alum
- 2. If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains
Options- A. Hydrogen sulphide
- B. Carbon dioxide
- C. Methane
- D. Oxygen
- E. None of these. Discuss
Correct Answer: Methane
- 3. The sewer that unloads the sewage at the point of treatment is called
Options- A. main sewer
- B. outfall sewer
- C. branch sewer
- D. house sewer. Discuss
Correct Answer: outfall sewer
- 4. The grit chambers of sewage treatment plants, are generally cleaned after
Options- A. 2 days
- B. 5 days
- C. 7 days
- D. 12 days
- E. 14 days. Discuss
Correct Answer: 14 days.
- 5. Fresh sewage is generally
Options- A. alkaline
- B. acidic
- C. highly decomposed
- D. a source of objectionable odour. Discuss
Correct Answer: alkaline
- 6. The spacing of bars for perforations in coarse screens used for the treatment of sewage, is
Options- A. 20 mm
- B. 30 mm
- C. 40 mm
- D. 50 mm
- E. 100 mm. Discuss
Correct Answer: 50 mm
- 7. For a continuous flow type of sedimentation tanks
Options- A. width of the tank is normally kept about 6 m
- B. length of the tank is normally kept 4 to 5 times the width
- C. maximum horizontal flow velocity is limited to 0.3 m/minute
- D. capacity of the tank for 24 hours, is kept equal to maximum daily flow of sewage
- E. all the above. Discuss
Correct Answer: all the above.
- 8. Pick up the incorrect statement from the following :
Options- A. The mixture of water and waste products, is called sewage
- B. The treated sewage effluents, are generally used for irrigating the crops
- C. The process of collecting, treating and disposing off the sewage, is called sewerage
- D. The old convergency system was definitely better than water carried sewerage system
- E. None of these. Discuss
Correct Answer: The old convergency system was definitely better than water carried sewerage system
- 9. The temperature affects the
Options- A. biological activity of bacterias in sewage
- B. solubility of gases in sewage
- C. viscosity of sewage
- D. all the above. Discuss
Correct Answer: all the above.
- 10. Faculative bacterias survive in
Options- A. the presence of oxygen
- B. the absence of oxygen
- C. both cases (a) and (b)
- D. neither (a) nor (b). Discuss
Correct Answer: both cases (a) and (b)
More in Civil Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.