Chemical Engineering MCQs

Page No. 441

When vaporisation takes place directly at the heating surface, it is called________________?


aFilm boiling

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bNucleate boiling

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cVapour binding

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dNone of these

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View Answer Nucleate boiling

Thermal conductivity of a conducting solid material depends upon its_______________?


aTemperature

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bPorosity

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the________________?


aSurrounding temperature

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bAverage temperature of the fin

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cTemperature of the fin end

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dConstant temperature equal to that of the base

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The actual temperature drop across the heating surface in an evaporator depends on the_________________?


aFeed

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bDepth of liquid over heating surface

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cPressure difference between steam chest and vapour space

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dAll A., B. and C.

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View Answer All A., B. and C.

Heat flux is the time rate of heat transfer per unit_______________?


aLength

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bArea

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cVolume

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dNone of these

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View Answer Area

The steam ejector is used to__________________?


aRemove condensate from the steam pipelines

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bCreate vacuum

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cSuperheat the steam

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dNone of these

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View Answer Create vacuum

Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is_____________?


aVertical heat exchanger with steam on tube side

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bVertical heat exchanger with steam on shell side

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cHorizontal heat exchanger with steam on tube side

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dHorizontal heat exchanger with steam on shell side

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Which of the following is generally considered as opaque surface towards radiations ?


aGases

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bSolids

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cLiquids

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dBoth B. and C.

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View Answer Both B. and C.

Fourier’s law of heat conduction applies to _____________ surfaces?


aIsothermal

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bNon-isothermal

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cBoth A. and B.

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dNeither A. and B.

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View Answer Both A. and B.

200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)?


a0.5

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b0.05

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c0.1

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d0.15

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View Answer 0.1

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