Waste Water Engineering problems
- 1. In detritus tanks,
Options- A. flow velocity is kept 0.09 m/sec
- B. detention period is kept 3 to 4 minutes
- C. organic and inorganic materials are separated
- D. all the above. Discuss
Correct Answer: all the above.
- 2. Assertion (A) : The determination of pH value of sewerage is important.
Reason (R) : The efficiency of certain treatment methods depends upon the availability of pH value.
Options- A. Both A and R are true and R is the correct explanation of A
- B. Both A and R are true but R is not a correct explanation of A
- C. A is true but R is false
- D. A is false but R is true. Discuss
Correct Answer: Both A and R are true and R is the correct explanation of A
- 3. With self cleansing velocity in sewers
Options- A. silting occurs at bottom
- B. scouring occurs at bottom
- C. both silting and scouring occur at bottom
- D. neither silting nor scouring occurs at bottom. Discuss
Correct Answer: neither silting nor scouring occurs at bottom.
- 4. Stone ware pipes are
Options- A. highly resistant to sulphide corrosion
- B. highly impervious
- C. hydraulically efficient because of their smooth interior surface
- D. specially suited to pressure pipes
- E. none of these. Discuss
Correct Answer: specially suited to pressure pipes
- 5. If ?w is the unit weight of water, r the hydraulic mean depth of the sewer and S the bed slope of the sewer, then the tractive force exerted by flowing water, is
Options- A. ?w . r . S
- B. ?w r1/2 . S
- C. ?w r S
- D. ?w r2/3 S Discuss
Correct Answer: ?w . r . S
- 6. Skimming tanks are
Options- A. used to remove the grease and oil
- B. those from which sludge is skimmed out
- C. tanks provided with self-cleansing screens
- D. improved version of grit chambers. Discuss
Correct Answer: used to remove the grease and oil
- 7. The sewage treatment in septic tanks is due to
Options- A. anaerobic decomposition
- B. aerobic decomposition
- C. parasitic decomposition
- D. none of these. Discuss
Correct Answer: anaerobic decomposition
- 8. The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is
Options- A. 5 m
- B. 5.5 m
- C. 6 m
- D. 6.5 m
- E. 7 m. Discuss
Correct Answer: 7 m.
- 9. D is the diameter of a circular sewer and ? is the side of a square section sewer. If both are hydraulically equivalent, the relationship which holds good, is
Options- A. ?D8/3 = 4 b8/3
- B. ?D3/8 = 4 b3/8
- C. ?D2/3 = 4 b2/3
- D. ?D3/2 = 4 b3/2
- E. none of these. Discuss
Correct Answer: ?D8/3 = 4 b8/3
- 10. Boussinesq's equation for ascertaining unit pressure at a depth H on sewers due to traffic loads, is
Options- A.
- B.
- C.
- D.
- E. none of these. Discuss
Correct Answer:
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