Waste Water Engineering problems
- 1. The recommended detention period for grit chambers is
Options- A. 1 minute
- B. 2 minutes
- C. 3 minutes
- D. 5 minutes. Discuss
Correct Answer: 1 minute
- 2. The most dangerous pollutant in vehicular emissions is
Options- A. CO
- B. SO2
- C. CO2
- D. O3. Discuss
Correct Answer: CO
- 3. The gradient of sewers depends upon
Options- A. velocity of flow
- B. diameter of the sewer
- C. discharge
- D. all the above. Discuss
Correct Answer: all the above.
- 4. For design purposes, the normal rate of infiltration of ground water into the sewer, is
Options- A. 500 litres/km/cm
- B. 1000 litres/km/cm
- C. 1500 litres/km/cm
- D. 2000 litres/km/cm
- E. 2500 litres/km/cm. Discuss
Correct Answer: 2000 litres/km/cm
- 5. Pick up the incorrect statement from the following :
Options- A. Septic tanks are horizontal continuous flow type of sedimentation tanks
- B. Septic tanks are generally provided a detention period of 12 to 36 hours
- C. Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases
- D. Septic tanks are generally classified as tanks which work on the principle of anaerobic decomposition
- E. None of these. Discuss
Correct Answer: None of these.
- 6. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
Options- A. should be sunk by 20 cm
- B. should be kept 20 cm above the adjacent portion
- C. should be sunk by 50 cm
- D. need not be sunk. Discuss
Correct Answer: should be sunk by 50 cm
- 7. Pick up the correct statement from the following :
Options- A. The maximum rate of storm run off is called peak drainage discharge
- B. Rational method of estimating peak run off, may be used precisely for areas less than 50 hectares
- C. The period after which the entire area starts contributing to the run off, is called the time of concentration
- D. The time required by water to reach the outlet of a catchment from the most remote point, is called time of concentration
- E. All the above. Discuss
Correct Answer: All the above.
- 8. The small sewers are cleaned by
Options- A. flushing
- B. cane rodding
- C. wooden pills
- D. none of these. Discuss
Correct Answer: flushing
- 9. For a circular sewer of diameter D running partially full with central angle ?,
Options- A.
- B.
- C.
- D.
- E. all the above. Discuss
Correct Answer: all the above.
- 10. The factor responsible for purification of sewage in river is
Options- A. Hydrology
- B. Dissolved oxygen in water
- C. Temperature
- D. Turbulence
- E. All the above. Discuss
Correct Answer: All the above.
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