Chemical Engineering MCQs

Page No. 431

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


aReynolds


bNusselt


cGrashoff


dBoth B. & C.


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


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


cBoth A. and B.


dNone of these



A 2-4 heat exchanger involves__________________?


aOnly counter-flow of fluids


bOnly parallel-flow of fluids


cBoth counter and parallel-flow of the fluids


dSmaller pressure drop compared to 1-2 exchanger



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


b0.50 D


c0.75 D


dNone of these


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


b970


c3.97


dNone of these


View Answer 180

Baffle spacing ____________________?


aIs not the same as baffle pitch


bShould be less than one fifth the diameter of the shell


cShould be less than the inside diameter of the shell


dNone of these



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


a∝ t


b∝ 1/t


c∝ √t


dIndependent of ‘t’


View Answer ∝ 1/t

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


aAvoid buckling of tubes


bProvide support for tubes


cDecrease the pressure drop


dFacilitate its lengthening, if needed



Mechanical recompression evaporation is used in the production of____________________?


aAlcohol


bDistilled water


cSalt


dFruits jam


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


bExcessive corrosion


cUneconomic LMTD


dDecrease in heat exchanger efficiency


View Answer Excessive corrosion

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