The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is__________________?

Related Mcqs:

1. 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...

2. In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is____________________?

   A. Q/(B × D) B. Q/(L × D) C. Q/L D. Q/(B × L)...

3. To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is_________________?

   A. 0.50 m/sec B. 0.60 m/sec C. 0.70 m/sec D. 0.75 m/sec...

4. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is__________________?

   A. 1 in 60 B. 1 in 100 C. 1 in 120 D. None of these...

5. 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...

6. 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...

7. In the case of steady flow of a fluid, the acceleration of any fluid particle is__________________?

   A. constant B. variable C. zero D. zero under limiting conditions E. never zero...

8. 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...

9. If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is_______________?

   A. D’ = 0.64 D B. D’ = 0.74 D C. D’ = 0.84 D D. D’ = 0.94 D...

10. The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is______________________?

    A. 213.5 cm/sec B. 313.5 cm/sec C. 413.5 cm/sec D. 500 cm/sec...