Civil Engineering - Waste Water Engineering
Exercise :: Waste Water Engineering - Section 1
| 6. |
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is |
| A. |
1 in 60 | | B. |
1 in 100 | | C. |
1 in 120 | | D. |
none of these. |
Answer: Option C
Explanation:
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| 7. |
Pick up the correct statement from the following : |
| A. |
pH value indicates acidity and alkalinity of sewage | | B. |
In acidic sewage, the pH value is less than 7 | | C. |
In alkaline sewage, the pH value is more than 7 | | D. |
Fresh sewage is generally alkaline | | E. |
All the above. |
Answer: Option E
Explanation:
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| 8. |
The non-clog pump which permits solid matter to pass out with the liquid sewage, is |
| A. |
centrifugal pump | | B. |
reciprocating pump | | C. |
pneumatic ejector | | D. |
none of these. |
Answer: Option A
Explanation:
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| 9. |
Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities. |
| A. |
Both A and R are true and R is the correct explanation of A | | B. |
Both A and R are true but R is not a correct explanation of A | | C. |
A is true but R is false | | D. |
A is false but R is true. |
Answer: Option A
Explanation:
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| 10. |
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is |
Answer: Option C
Explanation:
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