Chemical Engineering MCQs

Page No. 650

In paper industry, paper is dried in a _____________ dryer ?


aTunnel

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bHeated cylinder

✓


cConveyor

✖


dFestoon

✖


View Answer Heated cylinder

Relative humidity is the ratio of the______________________?


aPartial pressure of the vapour to the vapour pressure of the liquid at room temperature

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bPartial pressure of the vapour to the vapour pressure of the liquid at gas temperature

✓


cActual humidity to saturation humidity

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dNone of these

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As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches ____________________?


aThat of normal condensation

✓


bIntegral heat of adsorption

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cZero

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dNone of these

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Which of the following solutions will follow Raoult’s law most closely ?


aA solution of benzene, toluene and o-xylene

✓


b35% solution of camphor in water

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c35% solution of NH3 in water

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dA solution of polar organic compounds (not of homologue of a series)

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Mass transfer rate between two fluid phases does not necessarily depend on the ______________ of the two phases?


aChemical properties

✓


bPhysical properties

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cDegree of turbulence

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dInterfacial area

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View Answer Chemical properties

In a counter-current liquid extractor___________________?


aBoth liquids flow at fixed rate

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bBoth liquids can have any desired flow rate

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cOnly one of the liquids may be pumped at any desired rate

✓


dLiquid’s flow rate depends upon the temperature and pressure

✖



On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in______________________?


aGreater degree of separation with a fixed number of trays

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bIncreased reboiler load

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cIncreased reflux ratio

✓


dNone of these

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Mass transfer co-efficient (K) and diffusivity D. are related according to film theory as______________________?


aK ∝ D

✓


bK ∝√D

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cK ∝ D1.5

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dK ∝ D2

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View Answer K ∝ D

The caking of crystals can be prevented by _____________________?


aMaintaining high critical humidity

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bMaintaining low critical humidity

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cCoating the product with inert material

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dBoth A. and C.

✓


View Answer Both A. and C.

In distillation, overhead product contains ______________________?


aOnly one component

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bTwo components

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cAny number of components

✓


dOnly saturated liquid

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