# Civil Engineering - Waste Water Engineering

### Exercise :: Waste Water Engineering - Section 6

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.

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.

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).

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.

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.