Mechanical Operations problems
- 1. Which of the following gives the crushing energy required to create new surface?
Options- A. Taggarts rule
- B. Fick's law
- C. Rittinger's law
- D. none of these Discuss
Correct Answer: Rittinger's law
- 2. In bag filters, filter fabrics are never made of
Options- A. metallic wire woven mesh
- B. polyester fibres
- C. cotton fibres
- D. nylon fibres Discuss
Correct Answer: metallic wire woven mesh
- 3. Separation of isotopes is generally done using a/an __________ centrifuge.
Options- A. ultra
- B. disk-bowl
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: ultra
- 4. Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?
Options- A. Sand bed filter
- B. Plate and frame filter press
- C. Vacuum filter
- D. Batch basket centrifuge. Discuss
Correct Answer: Vacuum filter
- 5. Which of the following size reduction equipments employs mainly attrition for ultrafine grinding?
Options- A. Jet mills
- B. Fluid energy mill
- C. Micronizer
- D. all (a), (b) and (c) Discuss
Correct Answer: all (a), (b) and (c)
- 6. Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines?
Options- A. Compartment mill
- B. Rod mill
- C. Pebble mill
- D. Tube mill. Discuss
Correct Answer: Rod mill
- 7. Pick out the material having minimum Rittinger's number.
Options- A. Calcite
- B. Pyrite
- C. Quartz
- D. Galena Discuss
Correct Answer: Quartz
- 8. Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of 'scrappers'?
Options- A. Bucket conveyor
- B. Flight conveyor
- C. Screw conveyor
- D. Both (b) and (c) Discuss
Correct Answer: Both (b) and (c)
- 9. Rittinger's crushing law states that
Options- A. work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product.
- B. work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product.
- C. work required in crushing is proportional to the new surface created.
- D. for a given machine and feed, crushing efficiency is dependent on the size of the feed & product. Discuss
Correct Answer: work required in crushing is proportional to the new surface created.
- 10. In case of a revolving mill, wet grinding compared to dry grinding
Options- A. requires more energy.
- B. has less capacity.
- C. complicates handling & classification of the product.
- D. none of these. Discuss
Correct Answer: none of these.
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