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


cLow viscosity


dHigh fluidity



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


a1 and 0


b0 and 1


c1 and ∞


d0 and 0.5


View Answer 1 and 0

Stefan-Boltzmann law applies to _____________ body?


aBlack


bWhite


cGrey


dAny colour


View Answer Black

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


a1 kcal/hr. m2°C


b4.88 kcal/hr. m.2°C


c1 kcal/hr. m2.°K


dNone of these


View Answer 4.88 kcal/hr. m.2°C

A _____________ evaporator employs an annular downtake?


aBasket type


bHorizontal


cLong tube vertical


dNone of these


View Answer Basket type

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


aIncreases


bDecreases


cRemains unchanged


dMay increase or decrease; depends on its composition


View Answer Decreases

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


a1-2 heat exchanger


b1-1 heat exchanger


c3-2 heat exchanger


d2-4 heat exchanger


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


bLocal


cPool


dSaturated


View Answer Local

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


aExtremely low


bLow


cHigh


dNo


View Answer High

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


aApproach


bLog mean temperature difference


cArithmetic mean temperature difference


dGeometric mean temperature difference


View Answer Approach

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