Chemical Engineering MCQs

Page No. 465

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?


aCPA > CPB

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bCPA < CPB

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ckA < 0.5 kB

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dkA >2 kB

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View Answer kA < 0.5 kB

Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then_________________?


aU1 = U2

✓


bU2 > U1

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cU1 > U2

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dU1 = dirt factor – U2

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View Answer U1 = U2

Maximum heat transfer rate is achieved in _____________ flow?


aCo-current

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bCounter-current

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cTurbulent

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dLaminar

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View Answer Turbulent

Radiator of an automobile engine is a ______________ type of heat exchanger?


aCo-current

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bCross-current

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cCounter-current

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dDirect contact

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View Answer Direct contact

In forced convection, the Nusselt number is a function of ____________________?


aRe and Pr

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bRe and Gr

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cPr and Gr

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dRe and Sc

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View Answer Re and Pr

In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used________________?


aIn low range of temperature differences

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bIn high range of temperature differences

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cBecause of its low cost

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dTo prevent corrosion of the tube bundles

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The Stefan-Boltzmann constant depends on the_________________?


aMedium

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bMedium

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cSurface

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dNone of these

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View Answer None of these

For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it________________?


aOccupies smaller space

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bIs more economical

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cIs easy to operate and maintain

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dAll A., B. and C.

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View Answer All A., B. and C.

A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in ______________ minutes?


a10

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b> 10

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c< 10

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dEither B. or C., depends on the mass of the body

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View Answer > 10

Electro-magnetic spectrum range, which is important for radiation varies from _____________ microns?


a1 to 100

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b0.5 to 50

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c10 to 100

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d100 to 1000

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View Answer 0.5 to 50

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