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

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bEnhancing the fluid pumping rate

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cIncreasing the tube length

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dNone of these

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


aOpen pan evaporation

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bLong tube vertical evaporator

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cAgitated film evaporator

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dNone of these

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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

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bStraight line

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cParabola

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dCircular arc

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View Answer Straight line

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


aWhite & rough

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bBlack & rough

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cWhite & polished

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dBlack & polished

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View Answer Black & rough

Prandtl number is the ratio of________________?


aMass diffusivity to thermal diffusivity

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bMomentum diffusivity to thermal diffusivity

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cThermal diffusivity to mass diffusivity

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dThermal diffusivity to momentum diffusivity

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


aNature of heating surface and distribution of bubbles

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bSurface tension of water

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cViscosity of water

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dAll A., B. and C.

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View Answer All A., B. and C.

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


aAdmit the feed

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bRemove the product

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cFacilitate removal of non-condensable gases

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dCreate vacuum

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With increase in temperature, the thermal conductivity of steel___________________?


aIncreases

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bDecreases

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cRemains unchanged

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dIncreases exponentially

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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

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bZero

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cSame as average heat transfer co-efficient for tube side

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dNone of these

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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

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bLiquid viscosity

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cHot surface temperature

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dInterfacial tension

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View Answer Interfacial tension

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