Chemical Engineering MCQs

Page No. 446

What is Nusselt number ?


aCP. μ/k


bhD/k


ch. CP/μ


dCP. μ/h


View Answer hD/k

In the equation Q = UAΔt; Δt is_________________________?


aGeometric mean temperature difference


bArithmetic mean temperature difference


cLogarithmic mean temperature difference


dThe difference of average bulk temperatures of hot and cold fluids



For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in_____________________?


aIncreased economy


bDecreased economy


cLower capacity


dNo effect on economy


View Answer Increased economy

Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately ?


a32


b37


c45


d50


View Answer 32

Graetz number is given by__________________?


amCp/kL


bkL/mCp


cmCp/kμ


dkμ/mCp


View Answer mCp/kL

Reynold’s analogy states that_________________?


aNst α f


bNst α NRe


cNNu α f


dNRe α f


View Answer Nst α f

Which of the following has the minimum thermal conductivity ?


aNitrogen


bSteel


cCarbon black


dTar


View Answer Nitrogen

For an ideal black body______________________?


aAbsorptivity = 1


bReflectivity = 1


cEmissivity = 0


dTransmissivity = 1


View Answer Absorptivity = 1

For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a _______________ evaporator?


aHigh pressure


bVacuum


cBackward feed


dNone of these


View Answer Vacuum

Leidenfrost point is a term concerned with the____________________?


aCondensation of the saturated vapor on a cold surface


bConcentration of a corrosive solution by evaporation


cHeat transfer between two highly viscous liquids


dBoiling of a liquid on a hot surface



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