Discussion
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- Question
Which of the following is used for primary crushing of very hard lumpy materials?
Options- A. Toothed roll crusher
- B. Gyratory crusher
- C. Ball mill
- D. Tube mill
- Correct Answer
- Gyratory crusher
- 1. Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a
Options- A. disc bowl centrifuge.
- B. sharpies supercentrifuge.
- C. batch basket centrifuge.
- D. sparkler filter. Discuss
- 2. increasing the capacity of a screen __________ the screen effectiveness.
Options- A. decreases.
- B. increases
- C. does not effect
- D. none of these Discuss
- 3. Trommels separate a mixture of particles depending on their
Options- A. size
- B. density
- C. wettability
- D. electrical & magnetic properties Discuss
- 4. Which of the following mechanical conveyors does not come under the division 'carriers'?
Options- A. Belt conveyor
- B. Bucket elevator
- C. Screw conveyor
- D. Apron conveyor. Discuss
- 5. Maximum size reduction in a ball mill is done by the, __________ action.
Options- A. attrition
- B. compression
- C. impact
- D. cutting Discuss
- 6. __________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals.
Options- A. Separation efficiency
- B. Selectivity index
- C. Concentration ratio
- D. none of these Discuss
- 7. In case of a hammer crusher, the
Options- A. feed may be highly abrasive (Moh's scale >5).
- B. minimum product size is 3 mm.
- C. maximum feed size may be 50 mm.
- D. rotor shaft carrying hammers can be vertical or horizontal. Discuss
- 8. Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is
Options- A. 0.5
- B. 1
- C. 2
- D. 3 Discuss
- 9. Filtration of water in a paper mill is done by a/an __________ filter.
Options- A. open sand
- B. plate and frame
- C. vacuum leaf
- D. sparkler Discuss
- 10. A tube mill compared to a ball mill
Options- A. has a higher length/diameter ratio.
- B. produces a coarser product.
- C. has a higher diameter/length ratio.
- D. uses much larger balls. Discuss
Mechanical Operations problems
Search Results
Correct Answer: disc bowl centrifuge.
Correct Answer: decreases.
Correct Answer: size
Correct Answer: Screw conveyor
Correct Answer: impact
Correct Answer: Selectivity index
Correct Answer: rotor shaft carrying hammers can be vertical or horizontal.
Correct Answer: 1
Correct Answer: open sand
Correct Answer: has a higher length/diameter ratio.
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