Chemical Engineering Objective Questions { Mechanical Operations }

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288. Size reduction mechanism used in Jaw crushers is

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289. 200 mesh seive size corresponds to __________ microns.

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290. Moore filter is a __________ filter.

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291. __________ is used for producing a thick suspension from a thin slurry.

A. Cartridge filter

B. Rotary drum vacuum filter

C. Pressure filter thickener

D. Plate and frame filter press

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292. For coarse reduction of hard solids, use

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293. If D_p is the equivalent diameter of a non-spherical particle, V_p its volume and S_p its surface area, then its sphericity is Φ_s is defined by

A. Φ_s $$ = \frac{{6{{\text{V}}_{\text{p}}}}}{{{{\text{D}}_{\text{p}}}{{\text{S}}_{\text{p}}}}}$$

B. Φ_s $$ = \frac{{{{\text{V}}_{\text{p}}}}}{{{{\text{D}}_{\text{p}}}{{\text{S}}_{\text{p}}}}}$$

C. Φ_s $$ = \frac{{6{{\text{D}}_{\text{p}}}{{\text{S}}_{\text{p}}}}}{{{{\text{V}}_{\text{p}}}}}$$

D. Φ_s $$ = \frac{{{{\text{D}}_{\text{p}}}{{\text{S}}_{\text{p}}}}}{{{{\text{V}}_{\text{p}}}}}$$

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294. For spheres, the specific surface shape factor is given by

A. $$\frac{{{\text{AD}}}}{{\text{V}}}$$

B. $$\frac{{\text{D}}}{{\text{V}}}$$

C. $$\frac{{\text{A}}}{{\text{V}}}$$

D. $$\sqrt {\frac{{{\text{AD}}}}{{\text{V}}}} $$

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