Discussion
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- Question
Mass flow of granular solid (M) through a circular opening of dia, D follows
Options- A. M ? D
- B. M ? D2
- C. M ? D3
- D. M ? D
- Correct Answer
- M ? D3
- 1. To get ultrafine particles, the equipment used is a
Options- A. ball mill
- B. rod mill
- C. hammer crusher
- D. fluid energy mill Discuss
- 2. In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).
Options- A. Weber
- B. Peclet
- C. Brinkman
- D. Schmidt Discuss
- 3. Cumulative analysis for determining surface is more precise than differential analysis, because of the
Options- A. assumption that all particles in a single fraction are equal in size.
- B. fact that screening is more effective.
- C. assumption that all particles in a single fraction are equal in size, is not needed.
- D. none of these. Discuss
- 4. A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is
Options- A. 0.50
- B. 0.58
- C. 0.68
- D. 0.62 Discuss
- 5. The filter medium resistance is controlled by
Options- A. pressure drop alone
- B. flow rate alone
- C. both pressure drop and flow rate
- D. cake thickness Discuss
- 6. Separation of materials into products based on the difference of their sizes is called
Options- A. sizing
- B. sorting
- C. classification
- D. flocculation Discuss
- 7. __________ mills fall in the category of tumbling mills,
Options- A. Ball and pebble
- B. Rod and tube
- C. Compartment
- D. all (a), (b) & (c) Discuss
- 8. The maximum slope of a belt conveyor can be
Options- A. 15°
- B. 30°
- C. 45°
- D. 60° Discuss
- 9. To remove very small amount of tiny solid impurities from liquid, we use a
Options- A. pressure filter
- B. vacuum filter
- C. centrifugal filter
- D. coagulant Discuss
- 10. Energy requirement (per unit mass of material crushed/ground) is highest for
Options- A. jaw crusher
- B. rod mill
- C. ball mill
- D. fluid energy mill Discuss
Mechanical Operations problems
Search Results
Correct Answer: fluid energy mill
Correct Answer: Peclet
Correct Answer: assumption that all particles in a single fraction are equal in size, is not needed.
Correct Answer: 0.50
Correct Answer: both pressure drop and flow rate
Correct Answer: sizing
Correct Answer: all (a), (b) & (c)
Correct Answer: 30°
Correct Answer: coagulant
Correct Answer: fluid energy mill
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