Chemical Engineering MCQs

Page No. 623

Chance process is used for the________________?


aCleaning of coal


bConcentration of iron ore


cConcentration of pyrites


dWater treatment


View Answer Cleaning of coal

Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the _____________ filtration?


aConstant rate


bVarying pressure


cVarying rate


dConstant pressure


View Answer Constant rate

The important dimensional group involved in the power requirement calculation in mixing operation is the _____________ number?


aReynold’s


bFroude


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

During agitation of liquids, the_________________?


aFroude number is independent for the curves between power number and Reynolds number in baffled system


bPower number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller


cFroude number is used to account for the effect of surface (e.g., the centre vortex) on the power number


dAll A., B. and C.


View Answer All A., B. and C.

Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?


aJet mills


bFluid energy mill


cMicronizer


dAll A., B. and C.


View Answer All A., B. and C.

Ribbon blenders are exclusively meant for __________________?


aBlending miscible liquids


bNon-flowing powder and thin pastes


cBath mixing


dContinuous mixing



Critical Speed (Nc) of a ball mill is given by (where R1 and R2 are radii of ball mill and the ball respectively) ?


aNc = (1/4π). √(g/R1 – R2)


bNc = (1/2π). √(g/R1 – R2)


cNc = (1/π). √(g/R1 – R2)


dNc = (1/2π). √(R1 – R2/g)



The optimum moisture content in solids to be crushed/ground ranges from _______________ percent?


a3 to 4


b8 to 10


c10 to 15


d15 to 20


View Answer 3 to 4

Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a____________________?


aDisc bowl centrifuge


bSharpies super-centrifuge


cBatch basket centrifuge


dSparkler filter


View Answer Disc bowl centrifuge

Percentage of drum submerged in the slurry in case of rotary drum filter is ________________?


a3


b30


c85


d25


View Answer 30

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