Waste Water Engineering problems
- 1. For efficient working of a sewer, it must be ensured that
Options- A. minimum velocity of 0.45 m/sec, is maintained at its minimum flow
- B. a maximum velocity of 0.90 m/sec, is maintained at its maximum flow
- C. both (a) and (b)
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) and (b)
- 2. Pick up the correct statement from the following :
Options- A. Rate of digestion of slugde is more at higher temperature
- B. Thermophilic organisms digest the sludge if the temperature ranges from 40° to 60°C
- C. Mesophilic organisms digest the sludge if the temperature is between 25° and 40°C
- D. 90% of digestion takes place in 30 days at 29°C, the optimum mesophilic temperature
- E. All the above. Discuss
Correct Answer: All the above.
- 3. In Chezy's formula V = C rs for calculating the velocity of flow in circular sewer of diameter D running full, the value of hydraulic mean radius is
Options- A. D
- B.
- C.
- D.
- E.
Discuss
Correct Answer:
- 4. Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is
Options- A. centrifugal pump
- B. pneumatic ejector
- C. reciprocating pump
- D. none of these. Discuss
Correct Answer: centrifugal pump
- 5. Cement concrete sewers are only suitable if non-scouring velocity is between
Options- A. 2.5 to 3.0 m/sec
- B. 3.0 to 4.0 m/sec
- C. 3.5 to 4.5 m/sec
- D. 4.5 to 5.5 m/sec. Discuss
Correct Answer: 2.5 to 3.0 m/sec
- 6. The flow velocity in detritus tanks is
Options- A. 0.05 m/sec
- B. 0.09 m/sec
- C. 1.25 m/sec
- D. none of these. Discuss
Correct Answer: 0.09 m/sec
- 7. The Brake Horse power of the motor (efficiency 60%) required for a pump of capacity 0.075 cumec for a total lift of 12 m, is
Options- A. 10
- B. 15
- C. 20
- D. 25 Discuss
Correct Answer: 20
- 8. R.M.O. expenses include
Options- A. running expenses
- B. maintenance expenses
- C. operation expenses
- D. all the above. Discuss
Correct Answer: all the above.
- 9. If the flame of a miner's safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains
Options- A. Hydrogen sulphide
- B. Carbon dioxide
- C. Methane
- D. Oxygen
- E. None of these. Discuss
Correct Answer: Carbon dioxide
- 10. A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is
Options- A. 2.30 m
- B. 2.40 m
- C. 2.45 m
- D. 2.50 m. Discuss
Correct Answer: 2.45 m
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