Waste Water Engineering problems
- 1. In sewage having fully oxidised organic matter, the nitrogen exists in the form of
Options- A. nitrites
- B. nitrates
- C. free ammonia
- D. aluminoid nitrogen
- E. none of these. Discuss
Correct Answer: nitrates
- 2. For trunk and out-fall, the type of sewers generally used, is
Options- A. standard egg shaped
- B. circular shaped
- C. horse shoe shaped
- D. parabolic shaped
- E. semi-elliptical shaped. Discuss
Correct Answer: horse shoe shaped
- 3. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
Options- A. Bio-Chemical Oxygen Demand (B.O.D.)
- B. Dissolved Oxygen (D.O.)
- C. Chemical Oxygen Demand (C.O.D.)
- D. None of these. Discuss
Correct Answer: Dissolved Oxygen (D.O.)
- 4. Dry water flow in a combined sewer, is
Options- A. industrial sewage
- B. domestic sewage
- C. storm water
- D. inclusive of domestic and industrial sewage but excludes storm water. Discuss
Correct Answer: inclusive of domestic and industrial sewage but excludes storm water.
- 5. Pick up the correct statement from the following :
Options- A. Turbidity is more in strong sewage
- B. The black colour indicates septic sewage
- C. The fresh sewage is practically odourless
- D. The sewage omits offensive odours after four hours
- E. All the above. Discuss
Correct Answer: All the above.
- 6. In sewers the gas generally found, is
Options- A. Hydrogen sulphide (H2S)
- B. Carbon dioxide (CO2)
- C. Methane (CH4)
- D. Petrol vapours
- E. All the above. Discuss
Correct Answer: All the above.
- 7. Maximum permissible velocity 1.5 m/sec, is adopted in drains
Options- A. with beds of rocks and gravels
- B. lined with stones
- C. both (a) and (b)
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) and (b)
- 8. The algae dies out in the zone of
Options- A. degradation
- B. active decomposition
- C. recovery
- D. cleaner water. Discuss
Correct Answer: degradation
- 9. Pick up the correct statement from the following :
Options- A. Indore method of composting involves decomposition under aerobic conditions
- B. Bangalore method of composting involves decomposing under anaerobic conditions
- C. Fully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus
- D. all of these. Discuss
Correct Answer: all of these.
- 10. If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is
Options- A. ?
- B.
- C.
- D.
- E.
Discuss
Correct Answer:
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