For drainage pipes in buildings the test applied before putting them to use, is

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Question
For drainage pipes in buildings the test applied before putting them to use, is
Options
A. water test
B. smoke test
C. straightness test
D. all the above.

Correct Answer

smoke test

Waste Water Engineering problems

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2. Pick up the correct statement from the following :
Options
A. Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers
B. 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river
C. Solubility of oxygen in sewage is 95% of that of distilled water
D. Dissolved oxygen content of sewage, may be determined by Winkler's method
E. All the above.

4. Pick up the correct statement from the following :
Options
A. Maximum daily flow = 2 times the average daily flow
B. Maximum daily flow = x average daily flow
C. Sewers are designed for minimum permissible velocity at minimum flow
D. All the above.

8. 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).

9. 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.

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