Discussion
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- Question
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.
- Correct Answer
- 200 mesh screen has 200 openings per linear cm.
- 1. Mixing mechanism employed in a pan mixer is by
Options- A. mulling
- B. kneading
- C. dispersion
- D. none of these Discuss
- 2. Stamp mills are generally used for crushing
Options- A. iron ores
- B. gold ores
- C. talc
- D. diamond Discuss
- 3. 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
- 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
- 5. 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
- 6. 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
- 7. 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
- 8. Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?
Options- A. Wet grinding in low viscous suspension.
- B. Wet grinding in high viscous suspension.
- C. Dry grinding of large particles (upto 1.25 cms).
- D. Dry grindng of large particles in un-baffed mills. Discuss
- 9. Sphericity of raschig ring (whose length and diameter are equal) is
Options- A. >1
- B. <1
- C. 1
- D. 2 Discuss
- 10. With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge
Options- A. increases
- B. decreases
- C. remains constant
- D. increases linearly Discuss
Mechanical Operations problems
Search Results
Correct Answer: mulling
Correct Answer: gold ores
Correct Answer: shape factor
Correct Answer: toothed roll
Correct Answer:
Correct Answer: continuously decreases.
Correct Answer: all (a), (b) and (c)
Correct Answer: Dry grindng of large particles in un-baffed mills.
Correct Answer: 1
Correct Answer: increases
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