Chemical Engineering MCQs

Page No. 444

In evaporators, lowering the feed temperature_______________?


aIncreases the heating area required

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bReduces the economy

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cBoth A. and B.

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dDecreases the heating area required

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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

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bTube diameter & pitch

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cViscosity, density & mass velocity of shell side fluid

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dNone of these

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View Answer None of these

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


aCoated

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bOily

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cGlazed & polished

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dSmooth

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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

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b0.45

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c0.55

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d0.85

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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

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b2K/h0

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ch0/K

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dh0/2K

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View Answer 2K/h0

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


aSame velocity profile or equal eddy diffusivities

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bThermal or pressure mass diffusion

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cViscous heating or chemical reaction

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dBoth B. and C.

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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

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b9000

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c4600

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d3000

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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

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bBoundary surfaces are isothermal

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cMaterial is anisotropic

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dConstant temperature gradient exists

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


aIncreasing temperature

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bDecreasing temperature

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cDecreasing Reynolds number

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dNone of these

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Multiple effect evaporators ar used to___________________?


aIncrease the steam economy & decrease the capacity

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bIncrease the steam economy & the capacity

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cDecrease the steam economy & the capacity

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dDecrease the steam economy & increase the capacity

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