Mechanical Operations problems
- 1. 200 mesh screen means 200 openings per
Options- A. cm2
- B. cm
- C. inch
- D. inch2 Discuss
Correct Answer: inch
- 2. 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
Correct Answer: all (a), (b) and (c).
- 3. 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
Correct Answer: Cone type agitator
- 4. 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
Correct Answer: all 'a', 'b'&'c'.
- 5. Diatomaceous earth is a/an
Options- A. explosive
- B. filter aid
- C. filter medium
- D. catalyst Discuss
Correct Answer: filter aid
- 6. Highly viscous liquids & pastes are agitated by
Options- A. propellers
- B. turbine agitators
- C. multiple blade paddles
- D. none of these Discuss
Correct Answer: multiple blade paddles
- 7. 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
Correct Answer: 18 kWh/ton
- 8. 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
Correct Answer: separated by particle size.
- 9. Tabular bowl centrifuges as compared to disk bowl centrifuges
Options- A. operate at higher speed.
- B. employ bowl of larger diameter.
- C. can not be operated under pressure/vacuum.
- D. can't be used for separation of fine suspended solids from a liquid. Discuss
Correct Answer: operate at higher speed.
- 10. Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )
Options- A. D
- B. 1/D
- C. D2.5
- D. 1/D2.5 Discuss
Correct Answer: D2.5
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