Chemical Engineering MCQs

Page No. 460

Fqra cold viscous feed, backward feed gives _____________ than forward feed?


aA higher capacity

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bA lower capacity

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cLower economy

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dNone of these

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View Answer A higher capacity

The Graetz number is concerned with the___________________


aMass transfer between a gas and a liquid

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bAbsorption with chemical reaction

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cHeat transfer in turbulent flow

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dHeat transfer in laminar flow

✓



The unit of conductance in SI unit is_______________?


a W/m

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bW/m2

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cW/°K

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dW/m°K

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View Answer W/°K

Which of the following has the lowest Prandtl number ?


aMolten sodium (a coolant used in fast breeder reactor)

✓


bWater

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cTransformerTransformer oiloil

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dDilute H2SO4

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In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid _______________?


aIs inversely proportional to the resistance across which the drop occurs

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bAnd the wall are proportional to individual resistances

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cAnd the wall is not related

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dNone of these

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The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the________________ ?


aSolution has an elevation of boiling point

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bEvaporators operate under vacuum

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cEvaporators operate at atmospheric pressure

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dNone of these

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Nusselt number is a function of Prandtl number and ______________ number of fluid in natural convection heat transfer?


aGrashoff

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bBiot

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cStanton

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dReynolds

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View Answer Grashoff

Radiation energy is emitted by all the substances, which are above____________________?


a0°K

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b0°C

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c100°C

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dRoom temperature

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View Answer 0°K

The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is_________________?


aNusselt number

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bSherwood number

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cSchmidt number

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dStanton number

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View Answer Schmidt number

Loss of heat from untagged steam pipe to the ambient air is by __________________?


aConduction

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bConvection

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cRadiation

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dAll A., B. & C.

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View Answer All A., B. & C.

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