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- Question
Ball mills and tube mills with flint or porcelain balls are used for size reduction of
Options- A. asbestos
- B. rubber
- C. non-metallic ores
- D. limestone
- Correct Answer
- non-metallic ores
- 1. Two particles are called to be equal settling, if they are having the same.
Options- A. size.
- B. specific gravity.
- C. terminal velocities in the same fluid & in the same field of force.
- D. none of these. Discuss
- 2. Which of the following relationships between co-efficinet of friction (?) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct?
Options- A. ? > tan ?
- B. ? ? tan ?
- C. ? > tan 2?
- D. ? ? tan ? Discuss
- 3. Which of the following mineral dressing operations is termed as 'comminution'?
Options- A. Panning
- B. Spiralling
- C. Tabling
- D. None of these Discuss
- 4. Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ?= density of particles)
Options- A. m/? . Vp
- B. m . ?/Vp
- C. m . Vp/?
- D. Vp/m . ? Discuss
- 5. Gravity settling process is not involved in the working of a
Options- A. hydrocyclone
- B. classifier
- C. dorr-thickener
- D. sedimentation tank Discuss
- 6. 200 mesh screen means 200 openings per
Options- A. cm2
- B. cm
- C. inch
- D. inch2 Discuss
- 7. The capacity of a pneumatic conveying system depends upon the
Options- A. bulk density of materials.
- B. pressure of the conveying air.
- C. diameter of the conveying line.
- D. all (a), (b) and (c). Discuss
- 8. Which of the following is the most suitable for handling fibrous and dense slurries?
Options- A. Propeller agitator
- B. Cone type agitator
- C. Turbine agitator
- D. Radial propeller agitator Discuss
- 9. Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is
Options- A. added to the feed slurry.
- B. precoated on the filter medium prior to filtration.
- C. separated from the cake by dissolving solids or by burning it off.
- D. all 'a', 'b'&'c'. Discuss
- 10. Diatomaceous earth is a/an
Options- A. explosive
- B. filter aid
- C. filter medium
- D. catalyst Discuss
Mechanical Operations problems
Search Results
Correct Answer: terminal velocities in the same fluid & in the same field of force.
Correct Answer: ? ? tan ?
Correct Answer: None of these
Correct Answer: m/? . Vp
Correct Answer: hydrocyclone
Correct Answer: inch
Correct Answer: all (a), (b) and (c).
Correct Answer: Cone type agitator
Correct Answer: all 'a', 'b'&'c'.
Correct Answer: filter aid
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