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- Question
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is
Options- A. 0.50
- B. 0.58
- C. 0.68
- D. 0.62
- Correct Answer
- 0.50
- 1. The filter medium resistance is controlled by
Options- A. pressure drop alone
- B. flow rate alone
- C. both pressure drop and flow rate
- D. cake thickness Discuss
- 2. Wet seiving is employed, when the product contains __________ materials.
Options- A. abrasive
- B. large quantity of very fine
- C. coarse
- D. non-sticky Discuss
- 3. The unit of filter medium resistance is
Options- A. cm-1
- B. gm/cm-1
- C. cm/gm-1
- D. gm-1 Discuss
- 4. The energy consumed by a ball mill depends on
Options- A. its speed.
- B. its ball load.
- C. the density of the material being ground.
- D. all (a), (b) and (c). Discuss
- 5. Ultracentrifuges running at speeds upto 100000 rpm is normally used for the
Options- A. separation of isotopes based on their density or molecular weights difference.
- B. concentration of rubber latex.
- C. separation of cream from milk.
- D. dewaxing of lubricating oil. Discuss
- 6. Cumulative analysis for determining surface is more precise than differential analysis, because of the
Options- A. assumption that all particles in a single fraction are equal in size.
- B. fact that screening is more effective.
- C. assumption that all particles in a single fraction are equal in size, is not needed.
- D. none of these. Discuss
- 7. In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).
Options- A. Weber
- B. Peclet
- C. Brinkman
- D. Schmidt Discuss
- 8. To get ultrafine particles, the equipment used is a
Options- A. ball mill
- B. rod mill
- C. hammer crusher
- D. fluid energy mill Discuss
- 9. Mass flow of granular solid (M) through a circular opening of dia, D follows
Options- A. M ? D
- B. M ? D2
- C. M ? D3
- D. M ? D Discuss
- 10. Separation of materials into products based on the difference of their sizes is called
Options- A. sizing
- B. sorting
- C. classification
- D. flocculation Discuss
Mechanical Operations problems
Search Results
Correct Answer: both pressure drop and flow rate
Correct Answer: large quantity of very fine
Correct Answer: cm-1
Correct Answer: all (a), (b) and (c).
Correct Answer: separation of isotopes based on their density or molecular weights difference.
Correct Answer: assumption that all particles in a single fraction are equal in size, is not needed.
Correct Answer: Peclet
Correct Answer: fluid energy mill
Correct Answer: M ? D3
Correct Answer: sizing
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