Chemical Engineering MCQs

Page No. 450

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


a(ΔT)2

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b(ΔT)4

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c(ΔT)3

✓


d√(ΔT)

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View Answer (ΔT)3

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


aReduce the capacity

✓


bReduce the economy

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cIncrease the economy

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dNone of these

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View Answer Reduce the capacity

Film condensation is promoted on a/an _______________________ surface?


aOily

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bCoated

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cClean & smooth

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dDirty

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View Answer Clean & smooth

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


aNusselt

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bLeidenfrost

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cBoiling

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dBurnout

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View Answer Leidenfrost

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


aNucleate

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bPool

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cLow pressure

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dNone of these

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View Answer Pool

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


aPrandtl

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bReynolds

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Reynolds

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


aSteam ejector

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bEntrainment separator

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cCompressor

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dVacuum pump

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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

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b0.33

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c1

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d1.33

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View Answer 1

In forced circulation, the heating element is injected_________________?


aInternally

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bExternally

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cBoth A. and A.

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dNeither A. nor B.

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View Answer Internally

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


a2f

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bf

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cf/2

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df/4

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View Answer f/2

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