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- Question
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).
- Correct Answer
- all (a), (b) and (c).
- 1. 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
- 2. During size reduction by a jaw crusher, the energy consumed decreases with the
Options- A. decreasing size of product at constant size of feed.
- B. decreasing machine capacity.
- C. increasing size of feed at constant reduction ratio.
- D. none of these. Discuss
- 3. __________ is used for producing a thick suspension from a thin slurry.
Options- A. Cartridge filter
- B. Rotary drum vacuum filter
- C. Pressure filter thickener
- D. Plate and frame filter press Discuss
- 4. Cake resistance is
Options- A. important in the beginning of filtration.
- B. decreased with the time of filtration.
- C. independent of pressure drop.
- D. none of these. Discuss
- 5. Vibrating screens have capacity in the range of __________ tons/ft2 .mm mesh size.
Options- A. 0.2 to 0.8
- B. 5 to 25
- C. 50 to 100
- D. 100 to 250 Discuss
- 6. The unit of filter medium resistance is
Options- A. cm-1
- B. gm/cm-1
- C. cm/gm-1
- D. gm-1 Discuss
- 7. Wet seiving is employed, when the product contains __________ materials.
Options- A. abrasive
- B. large quantity of very fine
- C. coarse
- D. non-sticky Discuss
- 8. 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
- 9. 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 Discuss
- 10. 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
Mechanical Operations problems
Search Results
Correct Answer: separation of isotopes based on their density or molecular weights difference.
Correct Answer: increasing size of feed at constant reduction ratio.
Correct Answer: Pressure filter thickener
Correct Answer: none of these.
Correct Answer: 0.2 to 0.8
Correct Answer: cm-1
Correct Answer: large quantity of very fine
Correct Answer: both pressure drop and flow rate
Correct Answer: 0.50
Correct Answer: assumption that all particles in a single fraction are equal in size, is not needed.
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