Chemical Engineering MCQs

Page No. 469

Corrosiveness of steam condensate is due to the presence of________________?


aCO2

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bDissolved O2

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?


a0.2 D

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b0.5 D

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c0.66 D

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d0.80 D

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View Answer 0.2 D

Tube expansion allowances exist in _____________ heat exchanger?


aMultipass fixed tube sheet

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bU-tube

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cSingle pass fixed tube sheet

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dNone of these

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View Answer U-tube

Multiple effect evaporation accounts for___________________?


aSteam economy

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bLower operating costs

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cInvestment economy

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dNone of these

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View Answer Steam economy

A black body does not ____________ radiation?


aAbsorb or emit

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bRefract

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cReflect

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dBoth B. & C.

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View Answer Both B. & C.

An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a_________________?


aBoiler

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bHeat exchanger

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cHeat exchanger

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dRegenerator

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View Answer Heat exchanger

Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is__________________?


a0.4

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b0.5

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c0.6

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d0.7

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View Answer 0.7

Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around ______________ BTU?


a180

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b180

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c3.97

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dData insufficient, can’t be predicted

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View Answer 180

Stefan’s block body radiation law can also be derived from ______________ law?


aKirchoff’s

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bPlanck’s

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cFourier’s

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dNone of these

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View Answer Planck’s

What is the geometric mean of two heat transfer areas A1 and A2 ?


a√(A1 . A2)

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b√(A1 + A2)

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c½ √(A1 . A2)

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d2 √(A1 . A2)

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View Answer √(A1 . A2)

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