Chemical Engineering MCQs

Page No. 445

In natural convection heat transfer, the correlating parameter is the_______________________?


aGraetz number

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bEckert number

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cGrashoff number

✓


dBond number

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View Answer Grashoff number

Correction is applied to LMTD for __________ flow?


aParallel

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bCounter

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cCross

✓


dNone of these

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View Answer Cross

Increasing the liquor level in the evaporator results in the_______________?


aDecreased capacity

✓


bIncrease in liquor film co-efficient

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cDecreased effect of hydrostatic head

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dIncreased true temperature drop

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View Answer Decreased capacity

In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell) ?


aD/5 and D

✓


bD/2 and 2 D

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cD/4 and 2 D

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dD and 2 D

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View Answer D/5 and D

Double pipe heat exchangers are used__________________?


aWhen heat transfer area required is very high

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bWhen heat transfer area required is very low, i.e. (100-200 ft2).

✓


cBecause it occupies less floor area

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dBecause it is less costly

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A body is called grey if the monochromatic emissivity of the body is___________________?


aZero

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bUnity

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cSame for all wavelengths

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dDifferent for all wavelengths

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While the total emissivity of a perfect black body is unity, the same for a real body is__________________?


a0

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b1

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c> 1

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dBetween 0 and 1

✓


View Answer Between 0 and 1

Crystal size in a continuous crystalliser depends upon the___________________?


aRate of heat transfer

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bDegree of turbulence

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cDegree of super-saturation

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dAll A., B. and C

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View Answer All A., B. and C

Boiling of milk in an open vessel is an example of ______________ boiling?


aFilm

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bSub-cooled

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cSaturated nucleate

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dNone of these

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View Answer Film

Black liquor generated during paper manufacture is concentrated in a___________________?


aSingle effect evaporator

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bSingle effect evaporator followed by a crystalliser

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cMultiple effect evaporator

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dMultiple effect evaporators followed by a crystalliser

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