Chemical Engineering MCQs

Page No. 472

With increase in temperature, the total emissivity of conductors____________________?


aIncreases

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bDecreases

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cRemain same

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dDecreases linearly

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View Answer Increases

A multiple effect evaporator as compared to a single effect evaporator of the same capacity has _________________?


aLower heat transfer area

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bLower steam economy

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cHigher steam economy

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dHigher solute concentration in the product

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View Answer Higher steam economy

Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?


aSquare pitch

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bTriangular pitch

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cDiagonal square pitch

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dNone of these

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View Answer Triangular pitch

“The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium”. This is ______________ law?


aKirchoff’s

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bPlanck’s

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cWien’s displacement

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dStefan-Boltzmann

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View Answer Kirchoff’s

In a forward feed multiple effect evaporator, the pressure is ____________________?


aHighest in last effect

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bLowest in last effect

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cSame in all effects

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dDependent on the number of effects

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View Answer Lowest in last effect

For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is______________?


aNu = 0.023 Re0.8. Pr0.4

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bNu = (π/2) Gz

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cNu = (2/π) Gz

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dNu = 2Gz0.5

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View Answer Nu = (2/π) Gz

The non-dimensional temperature gradient in a liquid at the wall of a pipe is the ____________________?


aHeat flux

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bNusselt number

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cPrandtl number

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dSchmidt number

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View Answer Heat flux

The film co-efficient between condensing vapour and metal wall increases with _____________________?


aIncreasing temperature of the vapour

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bDecreasing temperature of the vapour

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cIncreasing viscosity of the film of condensate

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dIncreasing temperature drop

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With increase in temperature, the thermal conductivity of most liquids_________________?


aIncreases

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bDecreases

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cRemain same

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dFirst increases upto a certain temperature and then becomes constant

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View Answer Decreases

In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass _____________ through the heat exchanger ?


aOnce

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bTwice

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cThrice

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dFour times

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View Answer Twice

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