Chemical Engineering MCQs

Page No. 473

The driving potential for the crystal growth during crystallisation is the _______________ of the solution?


aConcentration


bViscosity


cSuper-saturation


dDensity


View Answer Super-saturation

Heat flux, as defined in heat flow is analogous to _______________ in electricity flow?


aCurrent


bVoltage


cResistance


dNone of these


View Answer Current

Conductance is given by (where, x = thickness, A = heat flow area, K = thermal conductivity.)?


ax/KA


bKA/x


cK/Ax


dA/Kx


View Answer KA/x

LMTD can’t be used as such without a correction factor for the_________________?


aMultipass heat exchanger


bBaffled heat exchanger


cCondensation of mixed vapour in a condenser


dAll A. B. and C.


View Answer All A. B. and C.

Heat sensitive materials can be concentrated in an evaporator employing_______________?


aVacuum


bHigh pressure


cHigh residence time


dNone of these


View Answer Vacuum

For what value of Prandtl number, St = f/2 ?


a1.5


b1


c> 1


d< 1


View Answer 1

In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?


aVaries directly as the area and the LMTD


bDirectly proportional to LMTD and inversely proportional to the area


cVaries as square of the area


dNone of these



Grashoff number is given by________________?


agD3.β.Δtρ2/μ2


bgD2βΔtρ/μ2


cgD2βΔtP2μ


dgD3βΔtP2/μ


View Answer gD3.β.Δtρ2/μ2

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?


aParabolic


bHyperbolic


cLinear


dLogarithmic


View Answer Parabolic

Which of the following is the most widely used heat insulating material for pipelines carrying steam ?


aTar dolomite bricks followed by asbestos


bFireclay refractory followed by aluminium sheet


cCotton followed by aluminium foil


d85% magnesia cement and glass wool



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