Discussion
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- Question
For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a
Options- A. Buhrstone mill
- B. ball mill
- C. crushing rolls
- D. hammer mill
- Correct Answer
- Buhrstone mill
- 1. 200 mesh seive size corresponds to __________ microns.
Options- A. 24
- B. 74
- C. 154
- D. 200 Discuss
- 2. In case of a hammer crusher, the final product size depends on the
Options- A. feed rate.
- B. rotor speed.
- C. clearance between hammer & grinding plates.
- D. all (a), (b) and (c). Discuss
- 3. Wet grinding in a revolving mill __________ as compared to dry grinding.
Options- A. gives less wear on chamber walls
- B. requires more energy
- C. increases capacity
- D. complicates handling of the product Discuss
- 4. For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as
Options- A. Np ? NRe
- B. Np ? NRe
- C. Np ? constant
- D. Np ? 1/NRe Discuss
- 5. For spheres, the specific surface shape factor is given by
Options- A. AD/V
- B. D/V
- C. A/V
- D. AD/V Discuss
- 6. Screen efficiency is
Options- A. recovery/rejection
- B. recovery
- C. rejection
- D. none of these Discuss
- 7. Supporting legs of a plate and frame filter is normally made of
Options- A. stainless steel
- B. cast iron
- C. high speed steel
- D. wooden plank Discuss
- 8. Sedimentation on commercial scale occurs in
Options- A. classifiers
- B. thickeners
- C. rotary drum filters
- D. cyclones Discuss
- 9. Which of the following is not an industrial screening equipment?
Options- A. Sharpies centrifuge
- B. Vibrating screen
- C. Grizzly
- D. Trommel Discuss
- 10. Pine oil and cresylic acid are used as __________ in the froth floatation process.
Options- A. frother
- B. collector
- C. depressor
- D. conditioner Discuss
Mechanical Operations problems
Search Results
Correct Answer: 74
Correct Answer: all (a), (b) and (c).
Correct Answer: increases capacity
Correct Answer: Np ? 1/NRe
Correct Answer: AD/V
Correct Answer: none of these
Correct Answer: cast iron
Correct Answer: rotary drum filters
Correct Answer: Sharpies centrifuge
Correct Answer: frother
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