Discussion
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- Question
__________ 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
- Correct Answer
- Minimum size
- 1. 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
- 2. Trommels employ __________ for screening of materials.
Options- A. fibrous cloth
- B. woven wire screen
- C. punched plate
- D. none of these Discuss
- 3. Specific surface area is the surface area of a unit __________ of materials.
Options- A. weight
- B. volume
- C. either (a) or (b)
- D. neither (a) nor (b) Discuss
- 4. For separation of sugar solution from settled out mud, we use a __________ filter.
Options- A. sparkler
- B. plate and frame
- C. centrifugal
- D. rotary drum vaccum Discuss
- 5. Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is
Options- A. kW. sec/kg
- B. kWh/kg
- C. kWh/sec. kg
- D. kg/sec. Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. Mixing of light fine powder such as insecticides is done by
Options- A. banbery mixer
- B. pug mill
- C. impact wheels
- D. kneader Discuss
Mechanical Operations problems
Search Results
Correct Answer: 2 to 5°
Correct Answer: punched plate
Correct Answer: either (a) or (b)
Correct Answer: centrifugal
Correct Answer: kW. sec/kg
Correct Answer: all 'a', 'b' & 'c'.
Correct Answer: Compression
Correct Answer: hammer crusher
Correct Answer: both (a) & (b).
Correct Answer: impact wheels
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