Chemical Engineering MCQs

Page No. 461

In Biot number, the characteristic length used is the ratio of the _______________ of the solid?


aVolume to surface area


bPerimeter to surface area


cSurface area to volume


dSurface area to perimeter



Boiling point elevation for a strong and concentrated solution is found by Duhring’s rule, which states that at the same pressure, the boiling point of a solution is a linear function of the _______________ of pure water?


aBoiling point


bDynamic viscosity


cKinematic viscosity


dDensity


View Answer Boiling point

Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K) ?


at4


bT4


c1/t4


d1/T4


View Answer T4

The equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?


aColburn


bReynolds


cPrandtl


dNone of these


View Answer Colburn

The range of electromagnetic spectrum important in heat transfer by radiation is ______________ microns?


a0.38-0.78


b0.5-50


c100-1000


d5-50


View Answer 0.5-50

Boiling point of a solution according to Duhring’s rule is a linear function of the _____________ of water?


aBoiling point (at the same pressure)


bViscosity


cDensity


dThermal conductivity



Prandtl number for most of dry gases is about________________?


a0.001


b0.72


c70


d150


View Answer 0.72

Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the________________?


aLess corrosion problems


bFlexibility possible in the baffle arrangement


cLow pressure drop


dHigh heat transfer co-efficient



The purpose of providing expansion bellows in the shell of tubular exchanger is to _____________________?


aIncrease the heating load


bImpart structural strength


cAccount for the uneven expansion of shell and tube bundles


dFacilitate increase of shell length, if needed



Multipass heat exchangers are used______________________?


aBecause of simplicity of fabrication


bFor low heat load


cTo obtain higher heat transfer co-efficient and shorter tube


dTo reduce the pressure drop



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