Chemical Engineering MCQs

Page No. 434

Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by____________________?


aKeeping the heat transfer surface clean


bEnhancing the fluid pumping rate


cIncreasing the tube length


dNone of these



Which is the most suitable for the concert-ration of highly concentrated solution ?


aOpen pan evaporation


bLong tube vertical evaporator


cAgitated film evaporator


dNone of these


View Answer Open pan evaporation

A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an___________________?


aEllipse


bStraight line


cParabola


dCircular arc


View Answer Straight line

A hot body will radiate heat most rapidly, if its surface is___________________?


aWhite & rough


bBlack & rough


cWhite & polished


dBlack & polished


View Answer Black & rough

Prandtl number is the ratio of________________?


aMass diffusivity to thermal diffusivity


bMomentum diffusivity to thermal diffusivity


cThermal diffusivity to mass diffusivity


dThermal diffusivity to momentum diffusivity



Rate of heat transfer by vaporisation from pools of water is affected by the ____________________?


aNature of heating surface and distribution of bubbles


bSurface tension of water


cViscosity of water


dAll A., B. and C.


View Answer All A., B. and C.

The purpose of providing bleed points in the evaporator is to__________________?


aAdmit the feed


bRemove the product


cFacilitate removal of non-condensable gases


dCreate vacuum



With increase in temperature, the thermal conductivity of steel___________________?


aIncreases


bDecreases


cRemains unchanged


dIncreases exponentially


View Answer Decreases

In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is_________________?


aInfinity


bZero


cSame as average heat transfer co-efficient for tube side


dNone of these


View Answer Infinity

Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface ?


aLiquid density


bLiquid viscosity


cHot surface temperature


dInterfacial tension


View Answer Interfacial tension

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