Mechanical Operations problems
- 1. 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
Correct Answer: all (a), (b) and (c).
- 2. 200 mesh seive size corresponds to __________ microns.
Options- A. 24
- B. 74
- C. 154
- D. 200 Discuss
Correct Answer: 74
- 3. 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 Discuss
Correct Answer: Buhrstone mill
- 4. Screen efficiency is
Options- A. recovery/rejection
- B. recovery
- C. rejection
- D. none of these Discuss
Correct Answer: none of these
- 5. 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
Correct Answer: cast iron
- 6. Sedimentation on commercial scale occurs in
Options- A. classifiers
- B. thickeners
- C. rotary drum filters
- D. cyclones Discuss
Correct Answer: rotary drum filters
- 7. Which of the following is not an industrial screening equipment?
Options- A. Sharpies centrifuge
- B. Vibrating screen
- C. Grizzly
- D. Trommel Discuss
Correct Answer: Sharpies centrifuge
- 8. Pine oil and cresylic acid are used as __________ in the froth floatation process.
Options- A. frother
- B. collector
- C. depressor
- D. conditioner Discuss
Correct Answer: frother
- 9. Which of the following is not used as a filter medium in case of corrosive liquids?
Options- A. Nylon
- B. Glass cloth
- C. Metal cloth of monel or stainless steel
- D. Cotton fabric Discuss
Correct Answer: Cotton fabric
- 10. Apron conveyors are used for
Options- A. heavy loads & short runs.
- B. small loads & long runs.
- C. heavy loads & long runs.
- D. none of these. Discuss
Correct Answer: heavy loads & short runs.
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