Discussion
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- Question
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)
- Correct Answer
- either (a) or (b)
- 1. 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
- 2. 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
- 3. The study on washability of coal is done by using the __________ technique.
Options- A. tabling
- B. elutriation
- C. heavy media separation
- D. none of these Discuss
- 4. A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.
Options- A. compartment
- B. tube
- C. rod
- D. pebble. Discuss
- 5. Addition of filter aid to the slurry before filtration is done to ...... of the cake.
Options- A. increase the porosity
- B. increase the compressibility co-efficient
- C. decrease the porosity
- D. decrease the compressibility co-efficient Discuss
- 6. Trommels employ __________ for screening of materials.
Options- A. fibrous cloth
- B. woven wire screen
- C. punched plate
- D. none of these Discuss
- 7. 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
- 8. __________ 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
- 9. 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
- 10. 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
Mechanical Operations problems
Search Results
Correct Answer: centrifugal
Correct Answer: kW. sec/kg
Correct Answer: heavy media separation
Correct Answer: compartment
Correct Answer: increase the porosity
Correct Answer: punched plate
Correct Answer: 2 to 5°
Correct Answer: Minimum size
Correct Answer: all 'a', 'b' & 'c'.
Correct Answer: Compression
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