Fluid medium used in the classification technique of mineral beneficiation is ai

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Question
Fluid medium used in the classification technique of mineral beneficiation is
Options
A. air
B. water
C. either (a) or (b)
D. neither (a) nor (b)

Correct Answer

either (a) or (b)

Mechanical Operations problems

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1. The basic filtration equation is given as where, V is volume of the filtrate ; A is the filtration area, a is specific cake resistance, ? is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry.
In a 20 minutes constant rate filtration, 5 m³ of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m³ of filtrate to be produced? Neglect filter medium resistance, Rm ; assume incompressible cake.
Options
A. 10
B. 20
C. 25
D. 30

3. Cartridge filters are termed as 'edge' filters, because of the fact that the
Options
A. disks have very sharp edge.
B. solids are not deposited at the edge of the disk.
C. bulk of the solids are removed at the periphery of the disks.
D. none of these.

5. In case of grinding in a ball mill
Options
A. wet grinding achieves a finer product size than dry grinding.
B. its capacity decreases with increasing fineness of the products.
C. grinding cost and power requirement increases with increasing fineness of the products.
D. all (a), (b) and (c).

6. Which of the following can be most effectively used for clarification of lube oil and printing ink?
Options
A. Sparkler filter
B. Precoat filter
C. Disc-bowl centrifuge
D. Sharpies supercentrifuge

7. Weber number is significant and is concerned with the
Options
A. solid-liquid mixing.
B. liquid-liquid mixing.
C. dispersion of liquid in liquid.
D. suspension of solid in liquid.

9. The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.? = density of solids, kg/m³)
Options
A. 3.6 AVS.?
B. 3.6 A.V.?
C. 3.6 A.S. ?
D. 3.6 AVS/?

10. The porosity of a compressible cake is
Options
A. minimum at the filter medium.
B. minimum at the upstream face.
C. maximum at the filter medium.
D. same throughout the thickness of cake.

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