Chemical Engineering MCQs

Page No. 632

In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG ______________ the absorption factor?


aIncreases with increase in

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bIs one at unity value of

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

If a1 and a2 are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement ?


aa1 = a2

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ba1 = 2a2

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ca1 = 0.5 a2

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dNone of these

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View Answer None of these

Percentage saturation is _______________ the relative saturation?


aAlways smaller than

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bAlways greater than

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cNot related to

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dNone of these

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View Answer Always smaller than

In an interphase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be_________________?


aLiquid phase resistance-controlled

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bGas phase resistance controlled

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cImpossible

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dDriven by a non-linear driving force

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Water-ethyl alcohol solution can be concentrated (in respect of alcohol concentration) by ________________ distillation?


aAtmospheric

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bVacuum

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cHigh pressure

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dNone of these

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View Answer Vacuum

When the temperature and humidity of air is low, we usually use _______________ draft cooling tower?


aNatural

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bForced

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cInduced

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dNone of these

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View Answer Natural

In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the__________________?


aTemperature and pressure

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bConcentration

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cNature of the constituents

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dNone of these

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View Answer None of these

Leaching of sugar from sugar beets is done by___________________?


aHot water

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bHexane

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cDilute H2SO4

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dLime water

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View Answer Hot water

In an absorber, HETP does not vary with the____________________?


aFlow rate of liquid

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bFlow rate of gas

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cType and size of packing

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dNone of these

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View Answer None of these

Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air ?


aDry bulb temperature

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bDew point

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cWet bulb temperature

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dNone of these

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View Answer Wet bulb temperature

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