Chemical Engineering MCQs

Page No. 450

The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature) ?


a(ΔT)2


b(ΔT)4


c(ΔT)3


d√(ΔT)


View Answer (ΔT)3

In a multiple effect evaporator, the effect of boiling point elevation is to______________________?


aReduce the capacity


bReduce the economy


cIncrease the economy


dNone of these


View Answer Reduce the capacity

Film condensation is promoted on a/an _______________________ surface?


aOily


bCoated


cClean & smooth


dDirty


View Answer Clean & smooth

In a boiling curve, the peak heat flux is called the _____________ point?


aNusselt


bLeidenfrost


cBoiling


dBurnout


View Answer Leidenfrost

In case of _____________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid?


aNucleate


bPool


cLow pressure


dNone of these


View Answer Pool

Nusselt number (for forced convection heat transfer) is a function of the _____________ number?


aPrandtl


bReynolds


cBoth A. & B.


dNeither A. nor B.


View Answer Reynolds

The separation of liquid droplets from the vapor is done by a/an _____________ in the evaporators?


aSteam ejector


bEntrainment separator


cCompressor


dVacuum pump


View Answer Entrainment separator

For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is_________________?


a3


b0.33


c1


d1.33


View Answer 1

In forced circulation, the heating element is injected_________________?


aInternally


bExternally


cBoth A. and A.


dNeither A. nor B.


View Answer Internally

According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor) ?


a2f


bf


cf/2


df/4


View Answer f/2

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