Chemical Engineering Answers

Define the term Sedimentation..............

Define the term thickener....

Define the term frothing agent in froth flotation process...........

select the correct statement

i) Cake filters separate relatively large amounts of solids as a cake of crystals ii) In cake filtration, after brief initial period the cake of solids does the filtration, not the septum

iii) In clarifying filters, the pores of filter medium are much larger in diameter than the particles to be removed iv) A precoat filter is a modified form of a rotary-drum filter

a) i) & ii) only b) i),ii) & iv) only c) i) & iv) only d) all of the above

Feed size of ≥ 25cms can be accepted by

a) Ball mill b). Rod mill

d) Fluid energy mil

Total resistances during washing of cake

a) Increases

b) Decreases

c) Remain constant

d). Changes

Define the term cross filtration?

In the Tyler standard screen series, with the inclusion of intermediate screens the ratio of the mesh dimension of any screen to that of the next smaller standard screen is...........

In axial flow conveyor centrifuges, the critical separation occurs

a). when particle reaches to the interface between the thin boundary layer and stagnant liquid pond

b) when particle is in stagnant liquid pond. c) when particle crosses stagnant liquid pond and touches the bowl wall

d) none of the above.

Define the term screen effectiveness..............