The standard B.O.D. of water is taken for_________________?

Related Mcqs:

1. ¾th or ¼th extra space is left in sewer pipes at maximum discharge for_________________?

   A. Low estimates of the average and maximum flows
   B. Large scale infiltration of storm water
   C. Unexpected increase in population
   D. All the above

2. Design period of 40 to 50 years is adopted for_________________?

   A. Branch sewers
   B. Main sewers
   C. Trunk sewers
   D. All the above

3. The detention time (t) of a settling tank, may be defined as the time required for_________________?

   A. A particle to travel along its length
   B. A particle to travel from top surface to bottom sludge zone
   C. The flow of sewage to fill the tank
   D. None of these

4. Sewer pipes need be checked for_________________?

   A. Minimum flow
   B. Maximum flow
   C. Both A. and B.
   D. None of these

5. The grit and silt of the grit chambers, may not be used for_________________?

   A. Raising low lying areas by dumping
   B. Concreting
   C. Both A. and B.
   D. Neither A. nor B

6. General energy equation holds for_________________?

   A. steady flow
   B. turbulent flow
   C. laminar flow
   D. non-uniform flow
   E. all of the above

7. The porosity of sediments in sewer pipes, is usually taken as___________________?

   A. 0.010
   B. 0.011
   C. 0.012
   D. 0.013

8. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of_________________?

   A. 0°C
   B. 15°C
   C. 20°C
   D. 25°C

9. The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________?

   A. 20 m
   B. 30 m
   C. 45 m
   D. 75 m

10. If is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is____________________?

    A. D²
    B. D²
    C. D²
    D. D²