Chemical Engineering MCQs

Page No. 445

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


aGraetz number


bEckert number


cGrashoff number


dBond number


View Answer Grashoff number

Correction is applied to LMTD for __________ flow?


aParallel


bCounter


cCross


dNone of these


View Answer Cross

Increasing the liquor level in the evaporator results in the_______________?


aDecreased capacity


bIncrease in liquor film co-efficient


cDecreased effect of hydrostatic head


dIncreased true temperature drop


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


cD/4 and 2 D


dD and 2 D


View Answer D/5 and D

Double pipe heat exchangers are used__________________?


aWhen heat transfer area required is very high


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


cBecause it occupies less floor area


dBecause it is less costly



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


aZero


bUnity


cSame for all wavelengths


dDifferent for all wavelengths



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


a0


b1


c> 1


dBetween 0 and 1


View Answer Between 0 and 1

Crystal size in a continuous crystalliser depends upon the___________________?


aRate of heat transfer


bDegree of turbulence


cDegree of super-saturation


dAll A., B. and C


View Answer All A., B. and C

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


aFilm


bSub-cooled


cSaturated nucleate


dNone of these


View Answer Film

Black liquor generated during paper manufacture is concentrated in a___________________?


aSingle effect evaporator


bSingle effect evaporator followed by a crystalliser


cMultiple effect evaporator


dMultiple effect evaporators followed by a crystalliser



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