Chemical Engineering MCQs

Page No. 429

For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area___________________?


aIncreases

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bDecreases

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cRemain constant

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dPasses through a maxima

✓



_____________ paint has the minimum absorption co-efficient?


aBlack

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bWhite lead

✓


cGrey

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dLight cream

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View Answer White lead

Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called_______________?


aRadiation

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bNatural convection

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cForced convection

✓


dConduction

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View Answer Forced convection

Steam traps are provided in steam carrying pipelines to_________________?


aCondense steam

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bRelease excess steam pressure by bleeding steam

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cRemove condensate and inert gases

✓


dNone of these

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Kirchoff‟s law applies to _____________ radiation?


aTotal

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bMonochromatic

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

Log mean temperature difference (LMTD) cannot be used, if ___________________?


aHeat transfer co-efficient over the entire heat exchanger is not constant

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bThere exists an unsteady state

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cThe heat capacity is not constant and there is a phase change

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dNone of these

✓


View Answer None of these

In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is_________________?


aMinimum

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bMaximum

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cZero

✓


dInfinity

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View Answer Zero

Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is __________________?


aIn the central core of the fluid

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bUniformly distributed throughout the fluid

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cMainly confined to a thin film of fluid near the surface

✓


dNone of these

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If Prandtl number is greater than the Schmidt number, then the____________________?


aThermal boundary layer lies inside the concentration boundary layer

✓


bConcentration boundary layer lies inside the thermal boundary layer

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cThermal & concentration boundary layers are of equal thickness

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dHydrodynamic (i.e., momentum) boundary layer is thicker than the other two

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Thermal diffusivity is the most important in heat transfer by__________________?


aConduction

✓


bRadiation

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cCondensation

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dNatural convection

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View Answer Conduction

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