Discussion
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- Question
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
- Correct Answer
- sticky (e.g. clay paste)
- 1. 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
- 2. Length/diameter ratio of a ball mill is
Options- A. 1.5
- B. 1
- C. < 1
- D. > 1 Discuss
- 3. Basic slag is not ground in
Options- A. jaw crushers
- B. ball mills
- C. compartment mills
- D. tube mills Discuss
- 4. For spheres, volume shape factor is given by
Options- A. ?(=A/D2)
- B. 2?(=2A/D2)
- C. ?/6(=V/D3)
- D. AD/V Discuss
- 5. Coal is finally pulverised to 200 mesh size for burning in boilers by a
Options- A. hammer crusher
- B. ball mill
- C. roll crusher
- D. gyratory crusher Discuss
- 6. Traces of solids are removed from, liquid in a
Options- A. classifier
- B. clarifier
- C. sparkler filter
- D. rotary vacuum filter Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Mechanical Operations problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: < 1
Correct Answer: jaw crushers
Correct Answer: ?/6(=V/D3)
Correct Answer: ball mill
Correct Answer: clarifier
Correct Answer: centrifugal pressure exerted by the liquid.
Correct Answer: increase the porosity
Correct Answer: compartment
Correct Answer: heavy media separation
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