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- Question
Which of the following equations is Rittinger's crushing law? (where P = power required by the machine, m = feed rate, k = a constant
= volume surface mean diameter of feed & product respectively.)
Options- A. P/m = K/Dp
- B. P/m = K . ln
- C. P/m = K .
- D. none of these.
- Correct Answer
- P/m = K .
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. General mechanism of size reduction in intermediate and fine grinder is by
Options- A. cutting action.
- B. compression.
- C. compression and tearing.
- D. impact and attrition. Discuss
- 7. Which of the following gives the crushing energy required to create new surface?
Options- A. Taggarts rule
- B. Fick's law
- C. Rittinger's law
- D. none of these Discuss
- 8. In bag filters, filter fabrics are never made of
Options- A. metallic wire woven mesh
- B. polyester fibres
- C. cotton fibres
- D. nylon fibres Discuss
- 9. Separation of isotopes is generally done using a/an __________ centrifuge.
Options- A. ultra
- B. disk-bowl
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 10. Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?
Options- A. Sand bed filter
- B. Plate and frame filter press
- C. Vacuum filter
- D. Batch basket centrifuge. Discuss
Mechanical Operations problems
Search Results
Correct Answer: ratio of feed opening to discharge opening.
Correct Answer: specific gravities
Correct Answer: increases
Correct Answer: Capacity of crusher in choke feeding is increased.
Correct Answer: heavy tonnages of rocks or gravel.
Correct Answer: impact and attrition.
Correct Answer: Rittinger's law
Correct Answer: metallic wire woven mesh
Correct Answer: ultra
Correct Answer: Vacuum filter
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