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

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b< 0.75

✓


c< 0.50

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d< 0.25

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View Answer < 0.75

Finned tube heat exchangers__________________?


aGive larger area per tube

✓


bUse metal fins of low thermal conductivity

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cFacilitate very large temperature drop through tube wall

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dAre used for smaller heat load

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


aLong tube

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bFalling film

✓


cHigh pressure

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dNone of these

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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

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bD-0.2

✓


cD0.2

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dD1.8

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View Answer D-0.2

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


aArithmetic

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bLogarithmic

✓


cGeometric

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dEither A. or C.

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View Answer Logarithmic

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


aTube layout

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bTube diameter

✓


cTube pitch

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dNumber of baffles

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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

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bMixed

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cCounter flow

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dSame in either A , B. or C.

✓



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


aSupersaturated

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bSaturated

✓


cWet

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dNone of these

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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

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bLess

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cSome

✓


dEither more or less; depends on the nature of vapor

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View Answer Some

Which of the following has maximum thermal conductivity ?


aIron

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bCoal

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cNitrogen

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dTar

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View Answer Iron

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