Related Questions

Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid.
A 2 to 3
B 0.01 to 0.10
C 200 to 300
D 100 to 1000
The terminal velocity of a small sphere settling in a viscous fluid varies as the
A First power of its dimeter
B Inverse of the fluid viscosity
C Inverse square of the diameter
D Square of the difference in specific weights of solid & fluid
In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.
A Inverse
B Square root
C Second power
D First power
The settling velocity of a particle in a sedimentation tank depends on
A Depth of tank
B Surface area of tank
C Both depth and surface area of tank
D None of the above
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is
A $$\frac{{\text{Q}}}{{{\text{B}} \times {\text{D}}}}$$
B $$\frac{{\text{Q}}}{{{\text{L}} \times {\text{D}}}}$$
C $$\frac{{\text{Q}}}{{\text{L}}}$$
D $$\frac{{\text{Q}}}{{{\text{B}} \times {\text{L}}}}$$
The settling velocity of a particle in a sedimentation tank increases if
A Particle size is decreased
B The surface area of tank is increased
C The depth of tank is decreased
D None of the above
Drag co-efficient in hindered settling is __________ that in free settling.
A Less than
B Equal to
C Not necessarily greater than
D Always greater than
For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is
A More
B Less
C Equal
D More or less, depending on the type of particle
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?
A Sphere
B Cube
C Cylinder (L/D = 1)
D Raschig rings
In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.
A Directly proportional to
B Inversely proportional to
C Inversely proportional to the square root of
D Independent of

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