Discussion
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- Question
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.
- Correct Answer
- Crushing efficiency is the ratio of the energy absorbed by the solid to the surfaces energy created by crushing.
- 1. Size reduction mechanism used in Jaw crushers is
Options- A. attrition
- B. compression
- C. cutting
- D. impact Discuss
- 2. 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
- 3. The speed of a rotary drum vacuum filter may be about __________ rpm.
Options- A. 1
- B. 50
- C. 100
- D. 500 Discuss
- 4. 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 Discuss
- 5. Size reduction of asbestos and mica is done by
Options- A. hammer mills
- B. rod mills
- C. gyratory crushers
- D. crushing rolls Discuss
- 6. A widely used size reduction equipment for __________ is Bradford breaker.
Options- A. talc
- B. coal
- C. iron core
- D. wheat Discuss
- 7. The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a
Options- A. boundary mixer.
- B. propeller agitator.
- C. sharpies centrifuge.
- D. none of these. Discuss
- 8. What is the selectivity index, if the grade of tailings & concentrate is the same?
Options- A. 0
- B. ?
- C. 1
- D. 0.5 Discuss
- 9. According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than
Options- A. 0.00184
- B. 0.0184
- C. 0.184
- D. 1.84 Discuss
- 10. The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the
Options- A. feed material.
- B. type of crushing machine.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
Mechanical Operations problems
Search Results
Correct Answer: compression
Correct Answer: 0.9
Correct Answer: 1
Correct Answer: 50
Correct Answer: hammer mills
Correct Answer: coal
Correct Answer: boundary mixer.
Correct Answer: 1
Correct Answer: 0.0184
Correct Answer: both (a) & (b).
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