Civil Engineering - Waste Water Engineering

11. 

The sewer which received discharge from two or more main sewers, is known as

A. a trunk sewer
B. an outfall sewer
C. a main sewer
D. an intercepting sewer.

Answer: Option A

Explanation:

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12. 

A well oxidized sewage contains nitrogen mainly as

A. nitrates
B. nitrites
C. free ammonia
D. none of these.

Answer: Option A

Explanation:

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13. 

A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

A. Carbondioxide gas
B. Hydrogen sulphide gas
C. Methane gas
D. Petrol vapours.

Answer: Option C

Explanation:

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14. 

Assertion (A) : A free board of 0.3 m is provided above the top sewage line in septic tanks.

Reason (R) : It helps to accommodate the scum in the septic tank.

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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15. 

If D is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is

A.
B.
C.
D.

Answer: Option A

Explanation:

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