Civil Engineering - Waste Water Engineering

36. 

The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called

A. a heap
B. plateu
C. windrow
D. none of these.

Answer: Option D

Explanation:

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37. 

If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is

A. 1.39 m
B. 1.49 m
C. 1.59 m
D. 1.69 m
E. 1.79 m.

Answer: Option D

Explanation:

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38. 

For efficient working of a sewer, it must be ensured that

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).

Answer: Option C

Explanation:

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39. 

A manhole is generally provided at each

A. bend
B. junction
C. change of gradient
D. change of sewer diameter
E. all the above.

Answer: Option E

Explanation:

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40. 

Pick up the correct statement from the following :

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.

Answer: Option E

Explanation:

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