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


bDecreases


cRemain constant


dPasses through a maxima



_____________ paint has the minimum absorption co-efficient?


aBlack


bWhite lead


cGrey


dLight cream


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


bNatural convection


cForced convection


dConduction


View Answer Forced convection

Steam traps are provided in steam carrying pipelines to_________________?


aCondense steam


bRelease excess steam pressure by bleeding steam


cRemove condensate and inert gases


dNone of these



Kirchoff‟s law applies to _____________ radiation?


aTotal


bMonochromatic


cBoth A. & B.


dNeither A. nor B.


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


bThere exists an unsteady state


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


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


bMaximum


cZero


dInfinity


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


bUniformly distributed throughout the fluid


cMainly confined to a thin film of fluid near the surface


dNone of these



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


cThermal & concentration boundary layers are of equal thickness


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



Thermal diffusivity is the most important in heat transfer by__________________?


aConduction


bRadiation


cCondensation


dNatural convection


View Answer Conduction

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