Chemical Engineering MCQs

Page No. 464

Water is normally used as a coolant in the heat exchange equipments mainly because of its___________________?


aAbundance & high heat capacity

✓


bLow density

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cLow viscosity

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dHigh fluidity

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Absorptivity and reflectivity of a perfect black body are respectively _______________?


a1 and 0

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b0 and 1

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c1 and ∞

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d0 and 0.5

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View Answer 1 and 0

Stefan-Boltzmann law applies to _____________ body?


aBlack

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bWhite

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cGrey

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dAny colour

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View Answer Black

A BTU/hr.ft.2 °F is equal to_________________?


a1 kcal/hr. m2°C

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b4.88 kcal/hr. m.2°C

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c1 kcal/hr. m2.°K

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dNone of these

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View Answer 4.88 kcal/hr. m.2°C

A _____________ evaporator employs an annular downtake?


aBasket type

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bHorizontal

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cLong tube vertical

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dNone of these

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View Answer Basket type

With increase in temperature, the thermal conductivity of fresh lubricating oil ___________________?


aIncreases

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bDecreases

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cRemains unchanged

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dMay increase or decrease; depends on its composition

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View Answer Decreases

To reduce the tube side pressure drop for the same flow rate, the heat exchanger recommended is _______________?


a1-2 heat exchanger

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b1-1 heat exchanger

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c3-2 heat exchanger

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d2-4 heat exchanger

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View Answer 1-1 heat exchanger

In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface?


aNucleate

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bLocal

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cPool

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dSaturated

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View Answer Local

For _______________ Prandtl number values, the heat conduction will be negligible in the buffer zone?


aExtremely low

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bLow

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cHigh

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dNo

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View Answer High

Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________________?


aApproach

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bLog mean temperature difference

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cArithmetic mean temperature difference

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dGeometric mean temperature difference

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View Answer Approach

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