Chemical Engineering MCQs

Page No. 430

LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is __________________?


a0


b1


c> 1


d< 1


View Answer < 1

The statement that “maximum wavelength of radiation is inversely proportional to the temperature” is ______________ law?


aStefan-Boltzmann’s


bPlanck’s


cWien’s displacement


dNone of these


View Answer Wien’s displacement

Among liquids, water has a comparatively high value of thermal conductivity, due to its__________________?


aLow density


bHigh viscosity


cPartial ionisation


dDense structure


View Answer Partial ionisation

In which mode of heat transfer, the Biot number is important ?


aTransient heat conduction


bNatural convection


cForced convection


dRadiation



A diathermanous substance _______________ the thermal radiation completely?


aAbsorbs


bReflects


cTransmits


dNone of these


View Answer Transmits

Boiling point elevation of a solution of NaOH _____________________?


aIncreases rapidly with temperature rise


bIs almost independent of temperature


cIs almost independent of pressure


dBoth B. and C


View Answer Both B. and C

Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.) ?


a√d


bd


cd2


dd1.5


View Answer d2

Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the____________________?


aMaximum resistance in the series


bSum of all resistances


cAverage of all resistances


dMinimum resistance presents in the series



Prandtl and Reynolds analogy are same, when Prandtl number is____________________?


a0.5


b1


c> 2


d1.5


View Answer 1

Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ____________________?


aThin walled having the value of Ao Ai/< 2


bThick walled


cHaving the value of Ao/Ai > 2


dBoth B. and C.



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