Waste Water Engineering problems
- 1. 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
Correct Answer: All the above.
- 2. 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
Correct Answer: 120 cm
- 3. Discrete or granular particles change their
Options- A. size
- B. shape
- C. weight
- D. none of these. Discuss
Correct Answer: none of these.
- 4. 'Cowl' is provided at
Options- A. lower end of ventilating column
- B. upper end of ventilating column
- C. upper end of the manhole
- D. first step in manhole. Discuss
Correct Answer: upper end of ventilating column
- 5. Large diameter sewers subjected to external pressure alone, are reinforced
Options- A. near the inner surface of the pipe
- B. near the outer surface of the pipe
- C. both (a) and (b)
- D. with elliptical cage
- E. none of these. Discuss
Correct Answer: with elliptical cage
- 6. The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is
Options- A. 20 cm
- B. 25 cm
- C. 40 cm
- D. 50 cm
- E. 60 cm. Discuss
Correct Answer: 50 cm
- 7. During putrifaction process of sewage the gas given off, is
Options- A. carbon dioxide
- B. hydrogen
- C. ammonia
- D. methane
- E. all the above. Discuss
Correct Answer: all the above.
- 8. A well oxidized sewage contains nitrogen mainly as
Options- A. nitrates
- B. nitrites
- C. free ammonia
- D. none of these. Discuss
Correct Answer: nitrates
- 9. The sewerage system originates from
Options- A. house sewers
- B. lateral sewers
- C. branch sewers
- D. main sewers
- E. out fall sewers. Discuss
Correct Answer: house sewers
- 10. The gas evolved in sewers is
Options- A. Carbondioxide
- B. Hydrogen sulphide
- C. Methane
- D. All of these. Discuss
Correct Answer: All of these.
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