Discussion
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- Question
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately?
Options- A. Rittinger's law
- B. Kick's law
- C. Bond's law
- D. none of these
- Correct Answer
- Rittinger's law
- 1. Electrical energy consumed by a jaw crusher is not a function of the
Options- A. average feed size
- B. average product size
- C. machine capacity
- D. none of these Discuss
- 2. Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?
Options- A. Sphere
- B. Cube
- C. Cylinder (L/D = 1)
- D. Raschig rings Discuss
- 3. Out of the following size reduction equipments, the maximum feed size can be accepted by the
Options- A. tube mill
- B. ball mill
- C. jaw crusher
- D. jet pulveriser Discuss
- 4. Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.
Options- A. 0.007
- B. 0.30
- C. 50
- D. 0.014 Discuss
- 5. Gold ore concentration is mostly done using
Options- A. jigging
- B. tabling
- C. froth floatation
- D. elutriation Discuss
- 6. Which of the following represents the plot of filtrate volume versus time for constant pressure filtration?
Options- A. Parabola
- B. Straight line
- C. Hyperbola
- D. Exponential curve Discuss
- 7. For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.
Options- A. plate & frame
- B. shell & leaf
- C. sand
- D. rotary vacuum Discuss
- 8. Mesh indicates the number of holes per
Options- A. square inch
- B. linear inch
- C. square foot
- D. linear foot Discuss
- 9. Colloid mills achieve size reduction mainly by
Options- A. impact
- B. attrition
- C. cutting
- D. compression Discuss
- 10. A pebble mill
Options- A. is a ball mill.
- B. employs flints or ceramic pebbles as the grinding medium.
- C. is a tube mill lined with ceramic or other non-metallic liner.
- D. both (b) and (c). Discuss
Mechanical Operations problems
Search Results
Correct Answer: none of these
Correct Answer: Sphere
Correct Answer: jaw crusher
Correct Answer: 0.30
Correct Answer: tabling
Correct Answer: Parabola
Correct Answer: sand
Correct Answer: linear inch
Correct Answer: attrition
Correct Answer: both (b) and (c).
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