Discussion
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- Question
For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.
Options- A. 10
- B. 25
- C. 50
- D. 75
- Correct Answer
- 50
- 1. Size reduction of asbestos and mica is done by
Options- A. hammer mills
- B. rod mills
- C. gyratory crushers
- D. crushing rolls Discuss
- 2. The most common filter aid is
Options- A. diatomaceous earth
- B. calcium silicate
- C. sodium carbonate
- D. silica gel Discuss
- 3. Moisture can be removed from lubricating oil using
Options- A. tubular centrifuge
- B. clarifier
- C. sparkler filter
- D. vacuum leaf filter Discuss
- 4. A pebble mill
Options- A. is a ball mill.
- B. employs flints or ceramic pebbles as the grinding medium.
- C. is a tube mill lined with ceramic or other non-metallic liner.
- D. both (b) and (c). Discuss
- 5. Colloid mills achieve size reduction mainly by
Options- A. impact
- B. attrition
- C. cutting
- D. compression Discuss
- 6. The speed of a rotary drum vacuum filter may be about __________ rpm.
Options- A. 1
- B. 50
- C. 100
- D. 500 Discuss
- 7. The sphericity of a cylinder of 1 mm diameter and length 3 mm is
Options- A. 0.9
- B. 0.78
- C. 0.6
- D. 0.5 Discuss
- 8. Size reduction mechanism used in Jaw crushers is
Options- A. attrition
- B. compression
- C. cutting
- D. impact Discuss
- 9. Pick out the wrong statement.
Options- A. Gape is the greatest distance between the crushing surfaces or the jaws.
- B. The angle of nip (2?) is the angle between roll faces at the level where they will j ust take hold of a particle and draw it in the crushing zone.
- C. Crushing efficiency is the ratio of the energy absorbed by the solid to the surfaces energy created by crushing.
- D. Reduction ratio is the ratio of the maximum size of the particles in the feed to that in the product. Discuss
- 10. A widely used size reduction equipment for __________ is Bradford breaker.
Options- A. talc
- B. coal
- C. iron core
- D. wheat Discuss
Mechanical Operations problems
Search Results
Correct Answer: hammer mills
Correct Answer: diatomaceous earth
Correct Answer: tubular centrifuge
Correct Answer: both (b) and (c).
Correct Answer: attrition
Correct Answer: 1
Correct Answer: 0.9
Correct Answer: compression
Correct Answer: Crushing efficiency is the ratio of the energy absorbed by the solid to the surfaces energy created by crushing.
Correct Answer: coal
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