The recommended detention period for grit chambers is_______________?

Related Mcqs:

1. If the grit in grit chambers is 4.5 million litres per day, its cleaning is done____________________?

   A. Manually B. Mechanically C. Hydraulically D. Electrically...

2. 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...

3. For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________?

   A. 16 m B. 20 m C. 24 m D. 30 m...

4. The grit chambers of sewage treatment plants, are generally cleaned after__________________?

   A. 2 days B. 7 days C. 12 days D. 14 days...

5. The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is_____________________?

   A. 204 cu.m B. 208 cu.m C. 212 cu.m D. 216 cu.m...

6. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________?

   A. 30 minutes B. 1 hour C. 1 hour and 30 minutes D. 2 hours...

7. The detention period for plain sedimentation water tanks, is usually____________________?

   A. 4 to 8 hours B. 8 to 16 hours C. 16 to 24 hours D. 24 to 36 hours...

8. The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________?

   A. 5 m B. 5.5 m C. 6.5 m D. 7 m...

9. In a grit chamber of a sewage treatment plant ____________________?

   A. Flow velocity 0.15 m to 0.3 m/sec is kept B. Depth of 0.9 m to 1.20 m is kept C. One minute of detention period is kept D. All the above...

10. The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is________________?

    A. d² (0.011d + 0.785H)/Q B. d (0.022d + 0.085H)/Q C. d (0.785d + 0.011H)/Q D. d (0.285d + 0.011H)/Q...