Mechanical Operations problems
- 1. Trommels employ __________ for screening of materials.
Options- A. fibrous cloth
- B. woven wire screen
- C. punched plate
- D. none of these Discuss
Correct Answer: punched plate
- 2. Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about
Options- A. 1 to 2°
- B. 2 to 5°
- C. 5 to 10°
- D. 10 to 15° Discuss
Correct Answer: 2 to 5°
- 3. __________ balls capable of grinding the feed in a ball mill gives the maximum efficiency.
Options- A. Cast iron
- B. Minimum size
- C. Maximum size
- D. Elliptical Discuss
Correct Answer: Minimum size
- 4. 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
Correct Answer: all 'a', 'b' & 'c'.
- 5. 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
Correct Answer: Compression
- 6. 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
Correct Answer: hammer crusher
- 7. 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
Correct Answer: both (a) & (b).
- 8. Mixing of light fine powder such as insecticides is done by
Options- A. banbery mixer
- B. pug mill
- C. impact wheels
- D. kneader Discuss
Correct Answer: impact wheels
- 9. 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 Discuss
Correct Answer: rod mills
- 10. 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
Correct Answer: over cake
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