Sludge volume index is defined as the ratio of_______________?

Related Mcqs:

1. For normal sludge, the value of sludge index for Indian conditions is________________?

   A. 0 to 50
   B. 50 to 150
   C. 150 to 350
   D. 350 to 500

2. For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as___________________?

   A. 4.5 to 6.0
   B. 6.5 to 8.0
   C. 8.5 to 10.0
   D. 10.5 to 12.0

3. For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be__________________?

   A. X/4
   B. X/2
   C. X
   D. 2X

4. The gas from sludge digestion tank is mainly composed of __________________?

   A. nitrogen
   B. carbon dioxide
   C. hydrogen sulphide
   D. methane

5. Composting and lagooning are the methods of_______________?

   A. sludge digestion
   B. sludge disposal
   C. sedimentation
   D. filtration

6. The time of concentration is defined as_______________?

   A. the time taken by rainfall water to run from most distant point of water shed to the inlet of sewer
   B. the time required for flow of water in sewer to the point under consideration
   C. sum of (A) and (B)
   D. difference of (A) and (B)

7. The ratio of 5 day BOD to ultimate BOD is about_______________?

   A. 1/3
   B. 2/3
   C. 3/4
   D. 1.0

8. Chlorine demand of water is equal to________________?

   A. applied chlorine
   B. residual chlorine
   C. sum of applied and residual chlorine
   D. difference of applied and residual chlorine

9. Sewerage system is designed for_______________?

   A. maximum flow only
   B. minimum flow only
   C. average flow only
   D. maximum and minimum flow

10. The most commonly used sewer under culverts is_______________?

    A. circular brick sewer
    B. circular cast iron sewer
    C. semi-elliptical sewer
    D. horse-shoe type sewer