Chemical Engineering MCQs

Page No. 470

The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is ________________?


a2


b1/2


c4


d1/4


View Answer 1/4

Which has the lowest Prandtl number ?


aLiquid metal


bAqueous solution


cWater


dLube oil


View Answer Liquid metal

In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is_________________?


aLinear


bHyperbolic


cParabolic


dNone of these


View Answer Parabolic

Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because___________________?


aConvection becomes important


bConduction becomes important


cRadiation becomes important


dSub-cooled boiling occurs



‘Duhring’s plot’ is of use in_________________?


aExtractive distillation


bEvaporation


cLeaching


dAbsorption


View Answer Evaporation

View factor is important in heat transfer by_____________________?


aSteady state conduction


bNatural convection


cForced convection


dRadiation


View Answer Radiation

Forced circulation evaporators are normally used for concentrating liquids having ___________________?


aScaling characteristics


bHigh viscosity


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

The equation, Nst = f/2, is the _____________ analogy?


aColburn


bReynolds


cPrandtl


dNone of these


View Answer Reynolds

Which of the following is directly concerned with the heat transfer ?


aStrouhal number


bSherwood number


cEuler number


dGrashoff number


View Answer Grashoff number

The thermal boundary layer at NPr > 1 ?


aIs thicker than hydrodynamic boundary layer


bIs thinner than hydrodynamic boundary layer


cAnd the hydrodynamic boundary layers are identical


dDisappears



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