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- Question
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
- Correct Answer
- Cone type agitator
- 1. 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
- 2. 200 mesh screen means 200 openings per
Options- A. cm2
- B. cm
- C. inch
- D. inch2 Discuss
- 3. 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 Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. Diatomaceous earth is a/an
Options- A. explosive
- B. filter aid
- C. filter medium
- D. catalyst Discuss
- 8. Highly viscous liquids & pastes are agitated by
Options- A. propellers
- B. turbine agitators
- C. multiple blade paddles
- D. none of these Discuss
- 9. The energy required per unit mass to grind limestone particles of very large size to 100 ?m is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 ?rn is
Options- A. 6.35 kWh/ton
- B. 9.0 kWh/ton
- C. 18 kWh/ton
- D. 25.4 kWh/ton Discuss
- 10. Jigging is a technique by which different particles can be
Options- A. separated by particle size.
- B. separated by particle density.
- C. separated by particle shape.
- D. mixed. Discuss
Mechanical Operations problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: inch
Correct Answer: non-metallic ores
Correct Answer: terminal velocities in the same fluid & in the same field of force.
Correct Answer: ? ? tan ?
Correct Answer: all 'a', 'b'&'c'.
Correct Answer: filter aid
Correct Answer: multiple blade paddles
Correct Answer: 18 kWh/ton
Correct Answer: separated by particle size.
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