Chemical Engineering MCQs

Page No. 431

jH factor for heat transfer is not a function of the _______________ number?


aReynolds

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bNusselt

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cGrashoff

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dBoth B. & C.

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View Answer Both B. & C.

In a heat exchanger, one transfer unit means___________________?


aA section of the exchanger in which change in temperature of one stream equals the average driving force in the section

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bThe size of the exchanger in which heat transfer rate is 1 kcal/hr

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cBoth A. and B.

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dNone of these

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A 2-4 heat exchanger involves__________________?


aOnly counter-flow of fluids

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bOnly parallel-flow of fluids

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cBoth counter and parallel-flow of the fluids

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dSmaller pressure drop compared to 1-2 exchanger

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In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell) ?


a0.25 D

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b0.50 D

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c0.75 D

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dNone of these

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View Answer 0.75 D

Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around ______________ BTU?


a180

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b970

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c3.97

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dNone of these

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View Answer 180

Baffle spacing ____________________?


aIs not the same as baffle pitch

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bShould be less than one fifth the diameter of the shell

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cShould be less than the inside diameter of the shell

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dNone of these

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The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) _________________?


a∝ t

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b∝ 1/t

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c∝ √t

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dIndependent of ‘t’

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View Answer ∝ 1/t

The purpose of floating head in a heat exchanger is to_________________?


aAvoid buckling of tubes

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bProvide support for tubes

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cDecrease the pressure drop

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dFacilitate its lengthening, if needed

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Mechanical recompression evaporation is used in the production of____________________?


aAlcohol

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bDistilled water

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cSalt

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dFruits jam

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View Answer Distilled water

The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid_________________?


aIts evaporation loss

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bExcessive corrosion

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cUneconomic LMTD

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dDecrease in heat exchanger efficiency

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View Answer Excessive corrosion

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