Chemical Engineering MCQs

Page No. 629

Physical absorption is__________________?


aAn irreversible phenomenon

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bA reversible phenomenon

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cAccompanied by evolution of heat

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dBoth B. and C.

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View Answer Both B. and C.

Ion exchange process is similar to___________________?


aAbsorption

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bAdsorption

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cExtraction

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dLeaching

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View Answer Adsorption

Only small amount of evaporation of water produces large cooling effects because of its___________________?


aLarge latent heat

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bLow viscosity

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cSmall latent heat

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dNone of these

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View Answer Large latent heat

As the reflux ratio decreases, the_________________?


aSeparation becomes more efficient

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bNumber of plates increases

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cColumn diameter increases

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dNone of these

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With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature) ?


aIncreases

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bRemains unchanged

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cDecreases

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dDecreases linearly

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View Answer Increases

Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the________________?


aLatent heat

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bHumid heat

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cSpecific heat

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dSensible heat

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View Answer Specific heat

For which of the following unit operations, Lewis number is of significance ?


aAdsorption

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bBinary distillation

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cGas absorption

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dHumidification

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View Answer Humidification

The minimum number of theoretical plates is required for achieving a given separation in distillation column with_________________?


aNo reflux

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bTotal reflux

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cZero reflux ratio

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dMinimum reflux ratio

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View Answer Total reflux

The drying time between fixed moisture contents within the ‘constant rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?


a√T

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bT

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cT1.5

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dT3

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View Answer T

Sticky material can be dried in a ________________ dryer ?


aTray

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bRotary

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cFluidised bed

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dNone of these

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View Answer Tray

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