Related Questions

For a particle settling in water at its terminal settling velocity, which of the following is true?
A Buoyancy = weight + drag
B Weight = buoyancy + drag
C Drag = buoyancy + weight
D Drag = weight
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
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
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
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 $$\frac{{\text{Q}}}{{{\text{B}} \times {\text{L}}}}$$
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
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity
A One-half
B One-third
C Two-third
D Three-fourth
The vector sum of cutting velocity and chip velocity is __________ shear velocity.
A Equal to
B Less than
C More than
D None of these

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