Chemical Engineering MCQs

Page No. 473

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


aConcentration

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bViscosity

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cSuper-saturation

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dDensity

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View Answer Super-saturation

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


aCurrent

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bVoltage

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cResistance

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dNone of these

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View Answer Current

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


ax/KA

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bKA/x

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cK/Ax

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dA/Kx

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View Answer KA/x

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


aMultipass heat exchanger

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bBaffled heat exchanger

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cCondensation of mixed vapour in a condenser

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dAll A. B. and C.

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View Answer All A. B. and C.

Heat sensitive materials can be concentrated in an evaporator employing_______________?


aVacuum

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bHigh pressure

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cHigh residence time

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dNone of these

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View Answer Vacuum

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


a1.5

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b1

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c> 1

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d< 1

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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

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bDirectly proportional to LMTD and inversely proportional to the area

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cVaries as square of the area

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dNone of these

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Grashoff number is given by________________?


agD3.β.Δtρ2/μ2

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bgD2βΔtρ/μ2

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cgD2βΔtP2μ

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dgD3βΔtP2/μ

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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

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bHyperbolic

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cLinear

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dLogarithmic

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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

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bFireclay refractory followed by aluminium sheet

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cCotton followed by aluminium foil

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d85% magnesia cement and glass wool

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