Chemical Engineering MCQs

Page No. 631

The Knudsen diffusivity is dependent on the ______________________?


aMolecular velocity only

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bPore radius of the catalyst only

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cMolecular mean free path only

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dMolecular velocity and pore radius of the catalyst

✓



Overall efficiency of the distillation column is _____________________?


aThe ratio of number of ideal plates to actual plates

✓


bThe ratio of number of actual plates to ideal plates

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cSame as the Murphree efficiency

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dAlways more than the point efficiency

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For a binary mixture with low relative volatility, continuous rectification to get pure products will require_____________________?


aLow reflux ratio

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bLess number of trays

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cSmall cross-section column

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dHigh reflux ratio

✓


View Answer High reflux ratio

Critical humidity of a solid salt means the humidity_____________________?


aAbove which it will always become damp

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bBelow which it will always stay dry

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cBoth A. and B.

✓


dAbove Which it will always become dry and below which it will always stay damp

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View Answer Both A. and B.

CO2 can be absorbed by____________________?


aHot cupric oxide

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bHeated charcoal

✓


cCold Ca(OH)2

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dAlumina

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View Answer Heated charcoal

The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is_________________?


aNatural draft cooling tower

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bInduced draft cooling tower

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cSpray chamber

✓


dNone of these

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View Answer Spray chamber

Solvent used in extractive distillation___________________?


aChanges the relative volatility of the original components

✓


bShould be of high volatility

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cShould form azeotropes with the original components

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dAll A., B. and C.

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Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is_________________?


aLess

✓


bMore

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cSame

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dUnpredictable

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View Answer Less

Which of the following remains constant during evaporative cooling process with recirculated water supply ?


aRelative humidity

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bPartial pressure of vapour

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cWet bulb temperature

✓


dNone of these

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View Answer Wet bulb temperature

If a two phase system is in physical equilibrium; then it means that, the_____________________?


aEscaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase

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bTemperature of the liquid phase is equal to that of the vapor phase

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cTotal pressure throughout the liquid phase is equal to that throughout the vapor phase

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dAll A., B. and C.

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View Answer All A., B. and C.

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