Chemical Engineering MCQs

Page No. 472

With increase in temperature, the total emissivity of conductors____________________?


aIncreases


bDecreases


cRemain same


dDecreases linearly


View Answer Increases

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


aLower heat transfer area


bLower steam economy


cHigher steam economy


dHigher solute concentration in the product


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


bTriangular pitch


cDiagonal square pitch


dNone of these


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


bPlanck’s


cWien’s displacement


dStefan-Boltzmann


View Answer Kirchoff’s

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


aHighest in last effect


bLowest in last effect


cSame in all effects


dDependent on the number of effects


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


bNu = (π/2) Gz


cNu = (2/π) Gz


dNu = 2Gz0.5


View Answer Nu = (2/π) Gz

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


aHeat flux


bNusselt number


cPrandtl number


dSchmidt number


View Answer Heat flux

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


aIncreasing temperature of the vapour


bDecreasing temperature of the vapour


cIncreasing viscosity of the film of condensate


dIncreasing temperature drop



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


aIncreases


bDecreases


cRemain same


dFirst increases upto a certain temperature and then becomes constant


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


bTwice


cThrice


dFour times


View Answer Twice

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