Chemical Engineering MCQs

Page No. 462

It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?


a> 0.75


b< 0.75


c< 0.50


d< 0.25


View Answer < 0.75

Finned tube heat exchangers__________________?


aGive larger area per tube


bUse metal fins of low thermal conductivity


cFacilitate very large temperature drop through tube wall


dAre used for smaller heat load



Fruit juice (a heat sensitive material) can be concentrated in a ____________ evaporator?


aLong tube


bFalling film


cHigh pressure


dNone of these


View Answer Falling film

The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re0.8, where, Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer co-efficient varies with the pipe diameter D. as _________________?


aD-1.8


bD-0.2


cD0.2


dD1.8


View Answer D-0.2

For heat flow through very thick walled cylinder, use ___________mean radius?


aArithmetic


bLogarithmic


cGeometric


dEither A. or C.


View Answer Logarithmic

In a shell and tube heat exchanger, the shell side fluid velocity can‟t be changed by changing the_________________?


aTube layout


bTube diameter


cTube pitch


dNumber of baffles


View Answer Tube diameter

LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counter-flow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the ______________ flow?


aParallel


bMixed


cCounter flow


dSame in either A , B. or C.



The maximum heat transfer co-efficient from steam heating will be attained when the steam is_________________?


aSupersaturated


bSaturated


cWet


dNone of these


View Answer Saturated

The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is___________________?


aMore


bLess


cSome


dEither more or less; depends on the nature of vapor


View Answer Some

Which of the following has maximum thermal conductivity ?


aIron


bCoal


cNitrogen


dTar


View Answer Iron

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