Chemical Engineering MCQs

Page No. 437

‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a_____________________?


aNon-dimensional factor


bFactor of safety


cConversion factor for individual film heat transfer co-efficient to overall heat transfer coefficient


dNone of these


View Answer Factor of safety

At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the___________________?


aBuffer zone


bTurbulent core


cBoth A. and B.


dViscous sub-layer


View Answer Viscous sub-layer

Film boiling occurs at ________________ pressure?


aAtmospheric


bSub-atmospheric


cNegative


dVery high


View Answer Very high

Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?


aThickness of the wall


bArea of the wall perpendicular to heat flow


cMaterial of the wall


dTemperature difference between the two surfaces of the wall



Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?


a1


b< 1


c> 1


d> 5


View Answer < 1

Double pipe heat exchangers are preferably useful, when____________________?


aHigh viscosity liquid is to be cooled


bRequirement of heat transfer area is low


cOverall heat transfer co-efficient is very high


dA corrosive liquid is to be heated



With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer ?


aDecreases


bIncreases


cIncreases exponentially


dRemain unaffected


View Answer Decreases

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ?


aDecreases


bIncreases


cRemains unchanged


dIncreases exponentially


View Answer Decreases

For a counter current heat exchanger with Ti h = 80°C, T°c = 60°C, T°h = 50°C and Ti c = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy___________________?


ad2T/dZ2 > 0


bd2T/dZ2 = 0


cd2T/dZ2 < 0


ddT/dZ = 0


View Answer d2T/dZ2 = 0

Heat flux through several resistances in series in analogous to the current flowing through several_____________________?


aResistances in parallel


bCapacitors in series


cResistances in series


dNone of these


View Answer Resistances in series

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