The cummulative mass fraction of particles smaller than size dj for a collection

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The cummulative mass fraction of particles smaller than size d_j for a collection of N_i particles of diameter d_i and mass mi (i = 1, 2, 3, ...... ?) is given by
Options
A. $The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of$
B. $The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of$
C. $The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of$
D. $The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of$

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Mechanical Operations problems

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2. Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.
Options
A. Jaw crusher, Ball mill, Fluid energy mill
B. Ball mill, Jaw crusher, Fluid energy mill
C. Fluid energy mill, Jaw crusher, Ball mill
D. Fluid energy mill, Ball mill, Jaw crusher

4. Pick out the correct statement.
Options
A. Plastic chips are called non-cohesive solids.
B. Kick's crushing law is, P/m = K . ln
C. Communition is a generic term for size enlargement operation.
D. Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'.

9. For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns.
Options
A. 5
B. 50
C. 500
D. 5000

10. Helical screw agitator is used for
Options
A. mixing highly viscous pastes.
B. blending immiscible liquids.
C. mixing liquids at very high temperature (> 250 �C).
D. none of these.

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