Discussion
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- Question
Pick out the wrong statement pertaining to the roll crushers.
Options- A. Maximum feed size determines the required roll diameter.
- B. For hard material's crushing, the reduction ratio should not exceed 4.
- C. Both the rolls run necessarily at the same speed.
- D. Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced.
- Correct Answer
- Both the rolls run necessarily at the same speed.
- 1. In case of a hammer crusher,
Options- A. crushing takes place by impact breaking.
- B. maximum acceptable feed size is 30 cms.
- C. reduction ratio can be varied by adjusting the distance from cage to hammers.
- D. all (a), (b) and (c). Discuss
- 2. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
Options- A. 4
- B. 1/4
- C. 1
- D. 1/2 Discuss
- 3. Which of the following is not categorised as a "mechanical operation"?
Options- A. Agitation
- B. Filtration
- C. Size enlargement
- D. Humidification Discuss
- 4. Balls for ball mills are never made of
Options- A. forged/cast steel
- B. lead
- C. cast iron
- D. alloy steel Discuss
- 5. Froth floatation is the most suitable for treating
Options- A. iron ores
- B. sulphide ores
- C. quartzite
- D. none of these Discuss
- 6. The value of 'angle of nip' is generally about
Options- A. 16°
- B. 32°
- C. 52°
- D. 64° Discuss
- 7. For sizing of fine materials, the most suitable equipment is a
Options- A. trommel
- B. grizzly
- C. shaking screen
- D. vibrating screen Discuss
- 8. If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the
Options- A. sedimentation
- B. flocculation
- C. dispersion
- D. centrifugation Discuss
- 9. Pick out the wrong statement.
Options- A. Recycled coarse material to the grinder by a classifier is termed as circulating load.
- B. Wear and tear in wet crushing is more than that in dry crushing of materials.
- C. Size enlargement (opposite of size reduction) is not a mechanical operation.
- D. A 'dust catcher' is simply an enlargement in a pipeline which permits the solids to settle down due to reduction in velocity of the dust laden gas. Discuss
- 10. Solid particles separation based on the difference in their flow velocities through fluids is termed as the
Options- A. clarification
- B. classification
- C. elutriation
- D. sedimentation Discuss
Mechanical Operations problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: 1/4
Correct Answer: Humidification
Correct Answer: lead
Correct Answer: sulphide ores
Correct Answer: 32°
Correct Answer: vibrating screen
Correct Answer: centrifugation
Correct Answer: Size enlargement (opposite of size reduction) is not a mechanical operation.
Correct Answer: classification
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