Discussion
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- Question
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
- Correct Answer
- heavy media separation
- 1. 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
- 2. 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
- 3. Driving force in case of filtration by a centrifuge is the
Options- A. speed of the centrifuge.
- B. centrifugal pressure exerted by the liquid.
- C. narrow diameter of the vessel.
- D. formation of highly porous cake. Discuss
- 4. Traces of solids are removed from, liquid in a
Options- A. classifier
- B. clarifier
- C. sparkler filter
- D. rotary vacuum filter Discuss
- 5. Bucket elevators are not suitable for the vertical lifting of __________ materials.
Options- A. fine (e.g. - 200 mesh size coal)
- B. sticky (e.g. clay paste)
- C. small lumpy (e.g. grains and sand)
- D. free flowing Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. Trommels employ __________ for screening of materials.
Options- A. fibrous cloth
- B. woven wire screen
- C. punched plate
- D. none of these Discuss
- 10. 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
Mechanical Operations problems
Search Results
Correct Answer: compartment
Correct Answer: increase the porosity
Correct Answer: centrifugal pressure exerted by the liquid.
Correct Answer: clarifier
Correct Answer: sticky (e.g. clay paste)
Correct Answer: kW. sec/kg
Correct Answer: centrifugal
Correct Answer: either (a) or (b)
Correct Answer: punched plate
Correct Answer: 2 to 5°
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