Discussion
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- Question
In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.
Options- A. primary
- B. secondary
- C. fine
- D. ultrafine
- Correct Answer
- fine
- 1. Screen capacity is expressed in terms of
Options- A. tons/hr
- B. tons/ft2
- C. both (a) & (b)
- D. tons/hr-ft2 Discuss
- 2. __________ conveyors are also called scrapers.
Options- A. Apron
- B. Screw
- C. Helical flight
- D. both (b) & (c) Discuss
- 3. Which one is a filter aid?
Options- A. Convas fabric
- B. Diatomaceous earth
- C. Calcined lime
- D. None of these Discuss
- 4. Half the angle of nip, (?), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively).
Options- A.
- B.
- C.
- D.
Discuss
- 5. Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the
Options- A. state or manner of application of the crushing force.
- B. ultimate strength of the material.
- C. elastic constant of the material.
- D. all (a), (b) and (c). Discuss
- 6. With increase in the capacity of screens, the screen effectiveness
Options- A. remains unchanged
- B. increases
- C. decreases
- D. decreases exponentially Discuss
- 7. To remove dirt from the flowing fluid, we use a
Options- A. coagulant
- B. gravity settler
- C. strains
- D. clarifier Discuss
- 8. Which of the following comes in the category of primary crusher for hard and tough stone?
Options- A. Jaw crusher
- B. Cone crusher
- C. Gyratory crusher
- D. None of these Discuss
- 9. A fluid energy mill is used for
Options- A. cutting
- B. grinding
- C. ultra grinding
- D. crushing Discuss
- 10. Which of the following is the softest material?
Options- A. Talc
- B. Feldspar
- C. Corundum
- D. Calcite Discuss
Mechanical Operations problems
Search Results
Correct Answer: tons/hr-ft2
Correct Answer: both (b) & (c)
Correct Answer: Diatomaceous earth
Correct Answer:
Correct Answer: all (a), (b) and (c).
Correct Answer: decreases
Correct Answer: strains
Correct Answer: Jaw crusher
Correct Answer: ultra grinding
Correct Answer: Talc
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