Related Questions

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
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 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
Two particles are called to be equal settling, if they are having the same.
A Size
B Specific gravity
C Terminal velocities in the same fluid & in the same field of force
D None of these
In classification, particles are said to be equal settling, if they have the same terminal velocities in the
A Different fluids
B Same fluid
C Same field of force
D Both B and C
Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their
A Particle sizes
B Densities
C Terminal velocities
D None of these
__________ are used for the separation of coarse particles from a slurry of fine particles.
A Thickeners
B Classifiers
C Hydrocyclones
D Decanters
For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.
A Film diffusion
B Diffusion through ash layer
C Chemical reaction
D Either A, B or C
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.
A Film diffusion
B Diffusion through ash layer
C Chemical reaction
D Either A, B or C
A slight ..... of the soil's settling rate caused the building's foundation to .... Which led to the building being deemed unusable.
A estimation, settle
B deviation ,bulge
C miscalculation ,shift
D permutation, stibnite

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