Chemical Engineering MCQs

Page No. 468

Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?


a0.2


b0.2


c0.6


d0.6


View Answer 0.6

Indirect contact heat exchangers are preferred over direct contact heat exchangers, because_________________?


aHeat transfer co-efficient are high


bThere is no risk of contamination


cThere is no mist formation


dCost of equipment is lower



Which of the following has the lowest overall heat transfer co-efficient ?


aDowtherm


bMolten sodium


cWater


dAir


View Answer Air

Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator ?


aLong vertical evaporator


bHorizontal tube evaporator


cAgitated film evaporator


dCalandria vertical tube evaporator



The absorptivity of a grey body at a given temperature _____________ with increasing wavelength of radiation?


aIncreases


bDecreases


cRemain constant


dMay increase or decrease; depends on the material



In case of heat transfer by conduction in a hollow cylinder, ______________ mean area is used to calculate the heat transfer rate?


aGeometric


bArithmetic


cArithmetic


dEither A., B. or C.


View Answer Arithmetic

The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are_______________?


aRe.Gz


bNu, Pr


cNu, Pr, Re


dNu, Gz


View Answer Nu, Gz

One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to________________?


aHeat the water from 0°C to 100°C


bEvaporate the water


cTo superheat the steam


dData insufficient, can’t be predicted


View Answer Evaporate the water

A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is ________________?


a0


bR2/(R1+R2)


c1


d(R1/R2)2


View Answer R2/(R1+R2)

Solid angle subtended by the finite surface at the radiating element is_________________?


aCalled the view factor


bCalled the angle of vision


cProportional to the square of the distance between surfaces


dExpressed in terms of radians



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