Chemical Engineering MCQs

Page No. 687

Large scale drying of wheat is done in a ________________ dryer?


aFluidised bed


bSpouted bed


cTray


dVacuum rotary


View Answer Spouted bed

With increase in temperature, the leaching rate increases due to__________________?


aDecreased liquid viscosity


bIncreased diffusivity


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed____________________?


aq > 1


bq < 1


cq = 1


dq = 0


View Answer q = 1

Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is ______________ that obtained for adsorption?


aLower than


bHigher than


cSame as


dEither same or higher than


View Answer Lower than

In an absorption column, the flooding velocity for random packing is ___________________ that for stacked/regular packing?


aGreater than


bSmaller than


cEqual to


dEither A., or B.; depends on the type of packing


View Answer Smaller than

In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the ______________ number ?


aLewis


bGrashoff


cSherwood


dNone of these


View Answer Lewis

Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be__________________?


aCooled


bHumidified


cBoth A. & B.


dDehumidified


View Answer Humidified

Mass transfer co-efficient is defined as__________________?


aFlux = Co-efficient/concentration difference


bCo-efficient = Flux/concentration difference


cFlux=concentration difference/coefficient


dNone of these



Large quantity of silica gel is normally dried in a _________________ dryer?


aFreeze


bThrough circulation


cRotary vacuum


dTray


View Answer Through circulation

The value of „L/mG’ ratio for economical absorption operation ranges from _____________________?


a0.5 to 0.8


b0.8 to 1.2


c1.25 to 2.0


d2.5 to 3.5


View Answer 1.25 to 2.0

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