Discussion
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- Question
Traces of solids are removed from, liquid in a
Options- A. classifier
- B. clarifier
- C. sparkler filter
- D. rotary vacuum filter
- Correct Answer
- clarifier
- 1. 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
- 2. A tube mill as compared to a ball mill
Options- A. employs smaller balls.
- B. gives finer size reduction but consumes more power.
- C. has larger length/diameter ratio (>2 as compared to 1 for ball mill).
- D. all (a), (b) and (c). Discuss
- 3. Length/diameter ratio of a ball mill is
Options- A. 1.5
- B. 1
- C. < 1
- D. > 1 Discuss
- 4. Basic slag is not ground in
Options- A. jaw crushers
- B. ball mills
- C. compartment mills
- D. tube mills Discuss
- 5. For spheres, volume shape factor is given by
Options- A. ?(=A/D2)
- B. 2?(=2A/D2)
- C. ?/6(=V/D3)
- D. AD/V Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Mechanical Operations problems
Search Results
Correct Answer: sticky (e.g. clay paste)
Correct Answer: all (a), (b) and (c).
Correct Answer: < 1
Correct Answer: jaw crushers
Correct Answer: ?/6(=V/D3)
Correct Answer: centrifugal pressure exerted by the liquid.
Correct Answer: increase the porosity
Correct Answer: compartment
Correct Answer: heavy media separation
Correct Answer: kW. sec/kg
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