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

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b1/2

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c4

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d1/4

✓


View Answer 1/4

Which has the lowest Prandtl number ?


aLiquid metal

✓


bAqueous solution

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cWater

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dLube oil

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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

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bHyperbolic

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cParabolic

✓


dNone of these

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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

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bConduction becomes important

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cRadiation becomes important

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dSub-cooled boiling occurs

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‘Duhring’s plot’ is of use in_________________?


aExtractive distillation

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bEvaporation

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cLeaching

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dAbsorption

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View Answer Evaporation

View factor is important in heat transfer by_____________________?


aSteady state conduction

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bNatural convection

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cForced convection

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dRadiation

✓


View Answer Radiation

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


aScaling characteristics

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bHigh viscosity

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

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


aColburn

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bReynolds

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cPrandtl

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dNone of these

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View Answer Reynolds

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


aStrouhal number

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bSherwood number

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cEuler number

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dGrashoff number

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View Answer Grashoff number

The thermal boundary layer at NPr > 1 ?


aIs thicker than hydrodynamic boundary layer

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bIs thinner than hydrodynamic boundary layer

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cAnd the hydrodynamic boundary layers are identical

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dDisappears

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