Discussion
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- Question
Size reduction does not occur due to compression in case of
Options- A. rod mills
- B. gyratory crushers
- C. jaw crushers
- D. smooth roll crushers
- Correct Answer
- rod mills
- 1. Mixing of light fine powder such as insecticides is done by
Options- A. banbery mixer
- B. pug mill
- C. impact wheels
- D. kneader Discuss
- 2. Horsepower required for a roll crusher is directly proportional to its
Options- A. reduction ratio.
- B. capacity.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 3. Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.
Options- A. jaw crusher
- B. hammer crusher
- C. ball mill
- D. tube mill Discuss
- 4. Which of the following terminology is not used for size reduction of materials to fine sizes or powders?
Options- A. Comminution
- B. Dispersion
- C. Pulverisation
- D. Compression Discuss
- 5. Rod mills employed for grinding
Options- A. employ a steel shell having L/D ratio of 1.5 to 3.0.
- B. is useful for handling sticky materials.
- C. employ steel rods of 2-12 cms diameter extending over full length of the mill.
- D. all 'a', 'b' & 'c'. Discuss
- 6. The specific cake resistance for compressible sludges is a function of the pressure drop
Options- A. over cake
- B. over medium
- C. overall
- D. none of these Discuss
- 7. Production rate __________ with increased fineness, with a given energy input to the size reduction machine.
Options- A. decreases
- B. increases
- C. remains unchanged
- D. may increase or decrease; depends on the machine Discuss
- 8. The unit of specific cake resistance is
Options- A. gm/cm2
- B. cm/gm
- C. cm/gm2
- D. gm/gm Discuss
- 9. Ultra centrifuges are used for the separation of __________ solid particles.
Options- A. coarse
- B. fine
- C. colloidal
- D. dissolved Discuss
- 10. According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively).
Options- A. (S/V)p
- B. (S/V)p
- C. (S/V)2p
- D. (S/V)f Discuss
Mechanical Operations problems
Search Results
Correct Answer: impact wheels
Correct Answer: both (a) & (b).
Correct Answer: hammer crusher
Correct Answer: Compression
Correct Answer: all 'a', 'b' & 'c'.
Correct Answer: over cake
Correct Answer: decreases
Correct Answer: gm/cm2
Correct Answer: colloidal
Correct Answer: (S/V)p
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