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- Question
The maximum depth of sedimentation tanks, is kept
Options- A. 3 m
- B. 3.5 m
- C. 4 m
- D. 4.5 m.
- Correct Answer
- 3 m
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. Pick up the correct statement from the following :
Options- A. Inlets are provided on the road surface at the lowest point for draining rain water
- B. Inlets are generally provided at an interval of 30 m to 60 m along straight roads
- C. Inlets having vertical openings, are called curb inlets
- D. Inlets having horizontal openings, are called horizontal inlets
- E. All the above. Discuss
- 10. The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is
Options- A. 100 cm
- B. 110 cm
- C. 120 cm
- D. 150 cm. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: 1 in 100 downward
Correct Answer: D' = 0.84 D
Correct Answer: Both A and R are true and R is the correct explanation of A
Correct Answer: are water seals which prevent the entry of foul gases
Correct Answer: less than the self-cleansing velocity
Correct Answer: the flow of sewage to fill the tank
Correct Answer: siphon spill way
Correct Answer: all the above.
Correct Answer: All the above.
Correct Answer: 120 cm
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