General mechanism of size reduction in intermediate and fine grinder is by cutti

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Question
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.

Correct Answer

impact and attrition.

Mechanical Operations problems

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1. 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/D_p
B. P/m = K . ln
C. P/m = K .
D. none of these.

2. 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.

5. 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'.

9. 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.

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