Mechanical Operations problems
- 1. The unit of filter medium resistance is
Options- A. cm-1
- B. gm/cm-1
- C. cm/gm-1
- D. gm-1 Discuss
Correct Answer: cm-1
- 2. Wet seiving is employed, when the product contains __________ materials.
Options- A. abrasive
- B. large quantity of very fine
- C. coarse
- D. non-sticky Discuss
Correct Answer: large quantity of very fine
- 3. 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
Correct Answer: both pressure drop and flow rate
- 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
Correct Answer: 0.50
- 5. 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
Correct Answer: assumption that all particles in a single fraction are equal in size, is not needed.
- 6. 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
Correct Answer: Peclet
- 7. To get ultrafine particles, the equipment used is a
Options- A. ball mill
- B. rod mill
- C. hammer crusher
- D. fluid energy mill Discuss
Correct Answer: fluid energy mill
- 8. 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 Discuss
Correct Answer: M ? D3
- 9. Separation of materials into products based on the difference of their sizes is called
Options- A. sizing
- B. sorting
- C. classification
- D. flocculation Discuss
Correct Answer: sizing
- 10. __________ 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
Correct Answer: all (a), (b) & (c)
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