Civil Engineering - Waste Water Engineering

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

A. 0.68 m
B. 0.88 m
C. 1.36 m
D. 1.76 m.

Answer: Option C

Explanation:

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