STUPIDSID
1(a)
Explain in brief different particle size measurement techniques.
4 M
1(b)
Write applications of fluidization
4 M
1(c)
Write short note on Ribben Blender.
4 M
1(d)
Write short note on Elutriation.
4 M
1(e)
What is minimum fluidization velocity.
4 M
2(a)
If crushing rolls, 1 m in diameter, are set so that the crushing surfaces are 12.5 mm apart and the angle of nip is 31°, what is the maximum size of particle which should be fed to the rolls?
If the actual capacity of the machine is 12% of the theoretical, calculate the throughput in Kg/sec when running at 2.0 Hz if the working face of the roll is 0.4m long and the bulk density of the feed is 2500 kg/m3.
If the actual capacity of the machine is 12% of the theoretical, calculate the throughput in Kg/sec when running at 2.0 Hz if the working face of the roll is 0.4m long and the bulk density of the feed is 2500 kg/m3.
10 M
2(b)
Discuss conditions for Fluidization in details.
10 M
3(a)
A slurry containing 5 kg of water/kg of solid is to be thickened to a sludge containing 1.5 kg of water/kg of solids in a continuous operation. A labroatory test five different concentrations of slurry yielded the following results:
Conc. (Kg water/kg of solid) 5.0 4.2 3.7 3.1 2.5
Rate of Sedimentation, (mm/sec) 0.20 0.12 0.094 0.070 0.052
Calculate the minimum area of the thickener to effect the separation of 1.33 kg/s of solids.
Conc. (Kg water/kg of solid) 5.0 4.2 3.7 3.1 2.5
Rate of Sedimentation, (mm/sec) 0.20 0.12 0.094 0.070 0.052
Calculate the minimum area of the thickener to effect the separation of 1.33 kg/s of solids.
10 M
3(b)
Discuss constant pressure filtration and constant rate filtration.
10 M
4(a)
Derive the expression to estimate the size of smallest particle that can be separated in Cyclone separator.
10 M
4(b)
Write construction, operation of continuous vacuum filtration unit and Derive the mathematical expression.
10 M
5(a)
Discuss Blake Jaw Crusher in detail.
10 M
5(b)
A sample of pyrite was screened. The screen analysis is given below.
(i) Calculate the mean surface diameter. Specific Gravity of pyrite is 5.0
(ii) Find specific surface.
| Mesh | 8/10 | 10/14 | 14/20 | 20/28 | 28/35 | 38/48 | 48/65 |
| Mass fraction retained | 0 | 21.2 | 19.6 | 17.4 | 14 | 15.8 | 12 |
| Aperture, mm | 1.651 | 1.168 | 0.833 | 0.589 | 0.417 | 0.295 | 0.208 |
(i) Calculate the mean surface diameter. Specific Gravity of pyrite is 5.0
(ii) Find specific surface.
10 M
6(a)
Write short note on :
(i) Bag Filter
(ii) Belt conveyor
(i) Bag Filter
(ii) Belt conveyor
10 M
6(b)
A bed of ion-exchange beads 2.4 m deep is to be backwashed with water to remove dirt
The particles have a density of 1.24 g/cm3 and an average size of 1.1 mm. What is the minimum fluidization velocity using water at 20°C, and what velocity is required to expand the bed by 25 percent? The beads are assumed to be spherical (Φ s = 1).
Given: ∈M = 0.40; m=3.9
The particles have a density of 1.24 g/cm3 and an average size of 1.1 mm. What is the minimum fluidization velocity using water at 20°C, and what velocity is required to expand the bed by 25 percent? The beads are assumed to be spherical (Φ s = 1).
Given: ∈M = 0.40; m=3.9
10 M
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