Waste Water Engineering problems
- 1. Kjedahl nitrogen is a mixture of
Options- A. ammonia and nitrogen
- B. nitrogen and organic nitrogen
- C. organic nitrogen and ammonia
- D. all the above. Discuss
Correct Answer: all the above.
- 2. In sewers the velocity of flow should not be
Options- A. more than the self-cleansing velocity
- B. less than the self-cleansing velocity
- C. less than 10 m/sec
- D. more than 20 m/sec. Discuss
Correct Answer: less than the self-cleansing velocity
- 3. Traps
Options- A. are water seals which prevent the entry of foul gases
- B. are used to trap the rats entering sewers
- C. dissolve the foul gases
- D. create syphonic action to increase the quick disposal of sewerage. Discuss
Correct Answer: are water seals which prevent the entry of foul gases
- 4. Assertion (A) : A free board of 0.3 m is provided above the top sewage line in septic tanks.
Reason (R) : It helps to accommodate the scum in the septic tank.
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
- 5. If D is the diameter of a circular sewer and D' is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is
Options- A. D' = 0.64 D
- B. D' = 0.74 D
- C. D' = 0.84 D
- D. D' = 0.94 D. Discuss
Correct Answer: D' = 0.84 D
- 6. The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is
Options- A. 1 in 100 upward
- B. 1 in 500 upward
- C. 1 in 100 downward
- D. 1 in 503 upward. Discuss
Correct Answer: 1 in 100 downward
- 7. The maximum depth of sedimentation tanks, is kept
Options- A. 3 m
- B. 3.5 m
- C. 4 m
- D. 4.5 m. Discuss
Correct Answer: 3 m
- 8. The detention time (t) of a settling tank, may be defined as the time required for
Options- A. a particle to travel along its length
- B. a particle to travel from top surface to bottom sludge zone
- C. the flow of sewage to fill the tank
- D. none of these. Discuss
Correct Answer: the flow of sewage to fill the tank
- 9. The most effective arrangement for diverting excess storm water into a natural drainage, is
Options- A. leaping weir
- B. overflow weir
- C. siphon spill way
- D. none of these. Discuss
Correct Answer: siphon spill way
- 10. For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by
Options- A. Kinchling
- B. Lloyd Davis
- C. Frubling
- D. all the above. Discuss
Correct Answer: all the above.
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