Chemical Engineering — Test 80
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Question 1
The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle) ?
Question 2
Trommels are revolving screens which normally operate in the range of _______________ rpm?
Question 3
Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?
Question 4
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the_____________________?
Question 5
Maximum size reduction in a fluid energy mill is achieved by___________________?
Question 6
Which of the following is not a wet classifier ?
Question 7
Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the _________________?
Question 8
Specific surface area is the surface area of a unit _______________ of materials?
Question 9
Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called__________________?
Question 10
If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the __________________?