Chemical Engineering MCQs

Page No. 610

To get ultrafine particles, the equipment used is a _________________?


aBall mill


bRod mill


cHammer crusher


dFluid energy mill


View Answer Fluid energy mill

Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about________________?


a1 to 2°


b2 to 5°


c5 to 10°


d10 to 15°


View Answer 2 to 5°

Tube mill compared to ball mill_______________________?


aProduces finer products


bIs long in comparison with its diameter


cUses smaller balls


dAll A., B. & C.


View Answer All A., B. & C.

In case of a hammer crusher, the final product size depends on the____________________?


aFeed rate


bRotor speed


cClearance between hammer & grinding plates


dAll A., B. and C.


View Answer All A., B. and C.

Size reduction of asbestos and mica is done by____________________?


aHammer mills


bRod mills


cGyratory crushers


dCrushing rolls


View Answer Hammer mills

The energy consumed by a ball mill depends on__________________?


aIts speed


bIts ball load


cThe density of the material being ground


dAll A., B. and C.


View Answer All A., B. and C.

The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is_______________?


a2


b√2


c1.5


d√3


View Answer √2

If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the __________________?


aSedimentation


bFlocculation


cDispersion


dCentrifugation


View Answer Centrifugation

Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called__________________?


aClassification


bSedimentation


cClarification


dDecantation


View Answer Sedimentation

Specific surface area is the surface area of a unit _______________ of materials?


aWeight


bVolume


cEither A. or B.


dNeither A. nor B.


View Answer Either A. or B.

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