Chemical Engineering MCQs

Page No. 460

Fqra cold viscous feed, backward feed gives _____________ than forward feed?


aA higher capacity


bA lower capacity


cLower economy


dNone of these


View Answer A higher capacity

The Graetz number is concerned with the___________________


aMass transfer between a gas and a liquid


bAbsorption with chemical reaction


cHeat transfer in turbulent flow


dHeat transfer in laminar flow



The unit of conductance in SI unit is_______________?


a W/m


bW/m2


cW/°K


dW/m°K


View Answer W/°K

Which of the following has the lowest Prandtl number ?


aMolten sodium (a coolant used in fast breeder reactor)


bWater


cTransformerTransformer oiloil


dDilute H2SO4



In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid _______________?


aIs inversely proportional to the resistance across which the drop occurs


bAnd the wall are proportional to individual resistances


cAnd the wall is not related


dNone of these



The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the________________ ?


aSolution has an elevation of boiling point


bEvaporators operate under vacuum


cEvaporators operate at atmospheric pressure


dNone of these



Nusselt number is a function of Prandtl number and ______________ number of fluid in natural convection heat transfer?


aGrashoff


bBiot


cStanton


dReynolds


View Answer Grashoff

Radiation energy is emitted by all the substances, which are above____________________?


a0°K


b0°C


c100°C


dRoom temperature


View Answer 0°K

The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is_________________?


aNusselt number


bSherwood number


cSchmidt number


dStanton number


View Answer Schmidt number

Loss of heat from untagged steam pipe to the ambient air is by __________________?


aConduction


bConvection


cRadiation


dAll A., B. & C.


View Answer All A., B. & C.

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