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This quiz contains multiple-choice problems on filtration basics and theory, the relation between cake thickness and filtrate, liquid flow through cloth, filtrate flow through cake and cloth, compressible filter cakes, pressure filters, optimum time cycle, filter press advantages, leaf and rotary filters, horizontal belt and Prayon’s continuous filters, construction materials and equipment, critical speed and centrifuge filtration.
As solids are deposited, the cake resistance will
Decrease
Increase
Constant
Stable
What does the below equation represent?
Velocity of cake
Velocity of filtrate
Velocity of discharge
Invalid relation
What is the optimum speed of a basket centrifuge?
100 to 500 rpm
800 to 1800 rpm
1500 to 2000 rpm
200 to 500 rpm
Centrifuge and automatic discharges are used for
Amorphous and product removal
Amorphous and feed removal
Crystalline and feed removal
Crystalline and product removal
The unloading time depends upon the
Longitudinal
Radial
Axial
Torque
In a conical screen filter, the liquid is impelled through a
Escaper
Torque
Centrifuge
Desolater
__ is the steepest angle at which a sloping surface is formed for loose material.
Angle of nip
Angle of repose
Angle of dump
Angle of crutch
Suppose the particles of a sump are sliding across a cone; which of the following is then correct?
cos Ө = α
cos Ө/2 < α
Ө = α
Ө/2 > α
If the angle of repose is too low, then velocity is __
Constant
Low
High
Optimum
The ratio of void volume to total surface area of particles is called
Resistance
Hydraulic radius
Repulsion
Void age
What does ε represent?
Porosity
Density
Viscosity
Acidity
Calculate ε if the total area is 45 m^2 and the void area is 100 m^2.
10.5
0.45
2.222
0.89
Calculate the hydraulic radius if porosity is 0.6 and specific gravity is 1.50.
0.6
1
0.2
1.8
__ of a liquid is defined as the liquid’s volumetric flow rate divided by its total area.
Final velocity
Total volume
Superficial velocity
Wetted perimeter
What does the following equation represent?
t = ft{c}
Cake formation
Drum rotation
Initial extraction
Extra time
