Waste Water Engineering problems
- 1. Pick up the correct statement from the following :
Options- A. The ratio of the quantity of the diluting water to that of the sewage, is known as dilution factor
- B. The automatic purification of polluted water, is known self purification phenomenon
- C. The photosynthesis is carried out in the presence of sun light
- D. Grab sample is generally obtained from the surface where turbulence mixes the sewage particles
- E. All the above. Discuss
Correct Answer: All the above.
- 2. For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed
Options- A. 1.5
- B. 2.0
- C. 2.5
- D. 3.0 Discuss
Correct Answer: 2.0
- 3. If D is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 4. The sewer which received discharge from two or more main sewers, is known as
Options- A. a trunk sewer
- B. an outfall sewer
- C. a main sewer
- D. an intercepting sewer. Discuss
Correct Answer: a trunk sewer
- 5. The stone ware sewers
Options- A. are used for carrying sewage and drainage from houses
- B. are manufactured from clays and shales
- C. after casting are dried and burnt at temperature 150°C, 700°C and 1200°C
- D. are generally provided with a water proof cover by vaporising sodium chloride
- E. all the above. Discuss
Correct Answer: all the above.
- 6. If D is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
Options- A. 1.250 D
- B. 1.350 D
- C. 1.425 D
- D. 1.625 D. Discuss
Correct Answer: 1.625 D.
- 7. If the grit in grit chambers is 4.5 million litres per day, its cleaning is done
Options- A. manually
- B. mechanically
- C. hydraulically
- D. electrically. Discuss
Correct Answer: manually
- 8. The ratio of depths at partial flow with central angle ? and at full flow of a sewer, is
Options- A.
- B.
- C.
- D.
- E.
Discuss
Correct Answer:
- 9. In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time
Options- A. 100 mm dia.
- B. 150 mm dia.
- C. 225 mm dia.
- D. all of these. Discuss
Correct Answer: 225 mm dia.
- 10. Pick up the correct statement from the following :
Options- A. The circular section of sewers provides maximum hydraulic mean depth
- B. The circular sewers are provided for separate sewerage system
- C. The circular sewers work efficiently if the sections run at least half full
- D. Two sewers of different shapes are said to be hydraulically equivalent if they discharge at the same rate while running full on the same grade
- E. All the above. Discuss
Correct Answer: All the above.
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