Discussion
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- Question
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.
- Correct Answer
- increasing size of feed at constant reduction ratio.
- 1. __________ 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
- 2. 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
- 3. 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
- 4. __________ mean diameter of particles is given by
Options- A. Mass
- B. volume
- C. Arithmetic
- D. Volume surface Discuss
- 5. Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation.
Options- A. clarification
- B. sedimentation
- C. flocculation
- D. classification Discuss
- 6. 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
- 7. 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
- 8. The unit of filter medium resistance is
Options- A. cm-1
- B. gm/cm-1
- C. cm/gm-1
- D. gm-1 Discuss
- 9. Wet seiving is employed, when the product contains __________ materials.
Options- A. abrasive
- B. large quantity of very fine
- C. coarse
- D. non-sticky Discuss
- 10. 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
Mechanical Operations problems
Search Results
Correct Answer: Pressure filter thickener
Correct Answer: none of these.
Correct Answer: 0.2 to 0.8
Correct Answer: volume
Correct Answer: classification
Correct Answer: separation of isotopes based on their density or molecular weights difference.
Correct Answer: all (a), (b) and (c).
Correct Answer: cm-1
Correct Answer: large quantity of very fine
Correct Answer: both pressure drop and flow rate
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