Chemical Engineering MCQs

Page No. 465

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?


aCPA > CPB


bCPA < CPB


ckA < 0.5 kB


dkA >2 kB


View Answer kA < 0.5 kB

Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then_________________?


aU1 = U2


bU2 > U1


cU1 > U2


dU1 = dirt factor – U2


View Answer U1 = U2

Maximum heat transfer rate is achieved in _____________ flow?


aCo-current


bCounter-current


cTurbulent


dLaminar


View Answer Turbulent

Radiator of an automobile engine is a ______________ type of heat exchanger?


aCo-current


bCross-current


cCounter-current


dDirect contact


View Answer Direct contact

In forced convection, the Nusselt number is a function of ____________________?


aRe and Pr


bRe and Gr


cPr and Gr


dRe and Sc


View Answer Re and Pr

In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used________________?


aIn low range of temperature differences


bIn high range of temperature differences


cBecause of its low cost


dTo prevent corrosion of the tube bundles



The Stefan-Boltzmann constant depends on the_________________?


aMedium


bMedium


cSurface


dNone of these


View Answer None of these

For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it________________?


aOccupies smaller space


bIs more economical


cIs easy to operate and maintain


dAll A., B. and C.


View Answer All A., B. and C.

A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in ______________ minutes?


a10


b> 10


c< 10


dEither B. or C., depends on the mass of the body


View Answer > 10

Electro-magnetic spectrum range, which is important for radiation varies from _____________ microns?


a1 to 100


b0.5 to 50


c10 to 100


d100 to 1000


View Answer 0.5 to 50

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