Mechanical Operations problems
- 1. Which of the following may prove unsuitable for filtering volatile liquids?
Options- A. Pressure filter
- B. Gravity filter
- C. Centrifugal filter
- D. Vacuum filter Discuss
Correct Answer: Vacuum filter
- 2. For classification of potable (drinking) water, we use a __________ filter.
Options- A. gravity sand
- B. plate and frame
- C. vacuum leaf
- D. rotary vacuum Discuss
Correct Answer: gravity sand
- 3. 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
Correct Answer: classification
- 4. __________ mean diameter of particles is given by
Options- A. Mass
- B. volume
- C. Arithmetic
- D. Volume surface Discuss
Correct Answer: volume
- 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
Correct Answer: 0.2 to 0.8
- 6. 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
Correct Answer: none of these.
- 7. __________ 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
Correct Answer: Pressure filter thickener
- 8. 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
Correct Answer: increasing size of feed at constant reduction ratio.
- 9. 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
Correct Answer: separation of isotopes based on their density or molecular weights difference.
- 10. 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
Correct Answer: all (a), (b) and (c).
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