Discussion
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- Question
In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
Options- A. 35
- B. 50
- C. 70
- D. 85
- Correct Answer
- 50
- 1. Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a
Options- A. pug mill
- B. mixer-extruder
- C. banbury mixer
- D. muller mixer Discuss
- 2. Cyclones are used primarily for separating
Options- A. solids
- B. solids from fluids
- C. liquids
- D. solids from solids Discuss
- 3. Tank filter (e.g., Nutsch filter) is
Options- A. a high pressure filter.
- B. a continuous filter.
- C. used for small scale filtration work.
- D. a leaf filter. Discuss
- 4. A __________ mixer resembles a ball mill without balls.
Options- A. banbery
- B. pug mill
- C. tumbling
- D. pan Discuss
- 5. Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
Options- A. 0.5 D
- B. D
- C. 1.5 D
- D. 2 D Discuss
- 6. Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the
Options- A. light metal powder down upto 4 meshsize.
- B. dry chemicals.
- C. heavy tonnages of rocks or gravel.
- D. powdered food & granular materials. Discuss
- 7. Pick out the wrong statement.
Options- A. Cummulative analysis for determining surface area is preferred over differential analysis, because of the assumption that "all particles in a simple fraction equal in size" is not needed for cummulative anslysis unlike differential anlaysis.
- B. A gate diagram is a plot of cummulative percent by weight undersize vs. the reciprocal of diameter, in which the area beneath the curve represents the surface.
- C. Capacity of crusher in choke feeding is increased.
- D. Rolling of pebbles/balls from top to bottom of the heap in tumbling mills is called 'cascading and throwing of the balls through the air to the toe of the heap is called 'cataracting'. Discuss
- 8. As the product becomes finer, the energy required for grinding
Options- A. decreases
- B. increases
- C. is same as for coarser grinding
- D. is 1.5 times that for coarser grinding Discuss
- 9. Ore concentration by jigging is based on the difference in the __________ of the particles.
Options- A. specific gravities
- B. wettability
- C. shape
- D. none of these Discuss
- 10. Reduction ratio of crushers is the
Options- A. ratio of feed opening to discharge opening.
- B. ratio of discharge opening to feed opening.
- C. determining factor for minimum dia of the feed and the product.
- D. none of these. Discuss
Mechanical Operations problems
Search Results
Correct Answer: pug mill
Correct Answer: solids from fluids
Correct Answer: used for small scale filtration work.
Correct Answer: tumbling
Correct Answer: D
Correct Answer: heavy tonnages of rocks or gravel.
Correct Answer: Capacity of crusher in choke feeding is increased.
Correct Answer: increases
Correct Answer: specific gravities
Correct Answer: ratio of feed opening to discharge opening.
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