Mechanical Operations problems
- 1. In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.
Options- A. smallest
- B. largest
- C. either (a) or (b)
- D. neither (a) nor (b) Discuss
Correct Answer: neither (a) nor (b)
- 2. Chance process is used for the
Options- A. cleaning of coal.
- B. concentration of iron ore.
- C. concentration of pyrites.
- D. water treatment Discuss
Correct Answer: cleaning of coal.
- 3. Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 4. Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher.
Options- A. Blake jaw
- B. toothed roll
- C. gyratory
- D. none of these. Discuss
Correct Answer: toothed roll
- 5. Reciprocal of sphericity is termed as the
Options- A. specific surface ratio
- B. shape factor
- C. sauter diameter
- D. surface area per unit mass Discuss
Correct Answer: shape factor
- 6. Stamp mills are generally used for crushing
Options- A. iron ores
- B. gold ores
- C. talc
- D. diamond Discuss
Correct Answer: gold ores
- 7. Mixing mechanism employed in a pan mixer is by
Options- A. mulling
- B. kneading
- C. dispersion
- D. none of these Discuss
Correct Answer: mulling
- 8. Pick out the wrong statement.
Options- A. Hammer crushers operate by impact action.
- B. Standard screens have circular opening.
- C. With increase in mesh number of screens, their diameter in microns decreases.
- D. 200 mesh screen has 200 openings per linear cm. Discuss
Correct Answer: 200 mesh screen has 200 openings per linear cm.
- 9. The filtrate flow rate in constant pressure filtration
Options- A. continuously increases.
- B. continuously decreases.
- C. remains constant throughout.
- D. may increase or decrease ; depends on the pressure. Discuss
Correct Answer: continuously decreases.
- 10. During filtration operation, the filtrate encounters the resistance of the
Options- A. filter medium.
- B. cake.
- C. channel carrying the slurry to the upstream side of the cake and filtrate away from the filter medium.
- D. all (a), (b) and (c) Discuss
Correct Answer: all (a), (b) and (c)
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