Chemical Engineering MCQs

Page No. 444

In evaporators, lowering the feed temperature_______________?


aIncreases the heating area required


bReduces the economy


cBoth A. and B.


dDecreases the heating area required


View Answer Both A. and B.

Shell side pressure drop in a shell and tube heat exchanger does not depend upon the_________________?


aBaffle spacing & shell diameter


bTube diameter & pitch


cViscosity, density & mass velocity of shell side fluid


dNone of these


View Answer None of these

The most conducive surface for dropwise condensation to occur is the _____________ surface?


aCoated


bOily


cGlazed & polished


dSmooth


View Answer Oily

Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?


a0.35


b0.45


c0.55


d0.85


View Answer 0.45

The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface) ?


aK/h0


b2K/h0


ch0/K


dh0/2K


View Answer 2K/h0

Analogy between mass and heat transfer is not applicable in case of____________________?


aSame velocity profile or equal eddy diffusivities


bThermal or pressure mass diffusion


cViscous heating or chemical reaction


dBoth B. and C.


View Answer Both B. and C.

An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is___________________?


a4000


b9000


c4600


d3000


View Answer 4000

Steady state one dimensional heat flow by conduction as given by Fourier’s low does not assume that_______________?


aThere is no internal heat generation


bBoundary surfaces are isothermal


cMaterial is anisotropic


dConstant temperature gradient exists



Heat transfer co-efficient (h1) for liquids increases with__________________?


aIncreasing temperature


bDecreasing temperature


cDecreasing Reynolds number


dNone of these



Multiple effect evaporators ar used to___________________?


aIncrease the steam economy & decrease the capacity


bIncrease the steam economy & the capacity


cDecrease the steam economy & the capacity


dDecrease the steam economy & increase the capacity



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