Mechanical Operations - Chemical Engineering Questions and Answers

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Mixing of light fine powder such as insecticides is done by

banbery mixer

pug mill

impact wheels

kneader

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Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.

jaw crusher

hammer crusher

ball mill

tube mill

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Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ?

Sphere

Cube

Cylinder (L/D = 1)

Raschig rings

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The unit of specific cake resistance is

gm/cm²

cm/gm

cm/gm²

gm/gm

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Size reduction of asbestos and mica is done by

hammer mills

rod mills

gyratory crushers

crushing rolls

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A pebble mill

is a ball mill.

employs flints or ceramic pebbles as the grinding medium.

is a tube mill lined with ceramic or other non-metallic liner.

both (b) and (c).

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The study on washability of coal is done by using the __________ technique.

tabling

elutriation

heavy media separation

none of these

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Horsepower required for a roll crusher is directly proportional to its

reduction ratio.

capacity.

both (a) & (b).

neither (a) nor (b).

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A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is

0.1

0.4

0.6

none of these