Chemical Engineering MCQs

Page No. 640

Pick out the wrong statement?


aWhen the concentration difference for the mass transfer becomes zero at the bottom of the gas absorption tower, then the upper end of the operating line touches the equilibrium curve

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bThe average distance between the operating line and equilibrium line is large, when the liquidgas ratio is also large in case of a counter current gas absorption tower

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cThe operating line lies above the equilibrium curve in case of a gas desorber

✓


dWith decrease in the liquid flow rate for a fixed gas flow rate, the slope of the operating line decreases, in case of gas absorption process

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View Answer The operating line lies above the equilibrium curve in case of a gas desorber

Pick out the wrong statement?


aIn the McCabe-Thiele diagram for binary distillation, vertical feed line represents saturated liquid feed and horizontal feed line represents saturated vapour feed

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bIn small columns, local efficiency is larger than Murphree efficiency; in large columns local efficiency is smaller than Murphree efficiency

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cFor Laminar flow over a plate of length L, the local mass transfer co-efficient at a distance L from the leading edge is 1.5 × 10-2m/s. Then the average mass transfer co-efficient for the plate is 2 × 10-2m/s

✓


dThe concentration and hydrodynamic boundary layers over a flat plate are of equal thickness, if Schmidt number is equal to unity

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View Answer For Laminar flow over a plate of length L, the local mass transfer co-efficient at a distance L from the leading edge is 1.5 × 10-2m/s. Then the average mass transfer co-efficient for the plate is 2 × 10-2m/s

Pick out the wrong statement ?


aCellulose acetate membranes are used in dialysis process

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bElutriation process refers to when the soluble material is largely concentrated on the surface of an insoluble solid and is simply washed off by the solvent

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cCascade’ means a group of stages interconnected so that various streams flow from one to another

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dZirconia probe is used for the humidity measurement

✓


View Answer Zirconia probe is used for the humidity measurement

Pick out the wrong statement?


aThe operating line always lies above the equilibrium solubility curve in case of a single component absorber

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bThe operating line always lies below the equilibrium solubility curve in case of a single component stripper

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cThe operating pressure in solvent extraction system should be below vapor pressures of all components

✓


dThe solubility of a particular gas in ideal solution in any solvent is always the same

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View Answer The operating pressure in solvent extraction system should be below vapor pressures of all components

Pick out the wrong statement?


aCritical moisture content is not a property of the material itself

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bA sharp increase in pressure drop gives an indication of the flooding in a distillation column

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cSeparation of components is not possible in liquid extraction, if selectivity is unity

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dDehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum

✓


View Answer Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum

With increase in pressure, the relative volatility for a binary system__________________?


aIncreases

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bDecreases

✓


cRemains same

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dEither A. or B., depends on the system

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View Answer Decreases

Which of the following adsorbent is used in the refining of sugar?


aBone charcoal

✓


bWood charcoal

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cSilica gel

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dActivated clay

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View Answer Bone charcoal

Channelling in a packed tower results from the_____________________?


aHigh pressure drop

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bMaldistribution of liquid

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cNon-uniformity of packing

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dBoth B. and C.

✓


View Answer Both B. and C.

The following plot gives the saturated humidity (He) versus temperature (T).Line joining (H1, T1) and (H2, T2) is the constant enthalpy line. Choose the correct one from among the alternatives A, B, C and D____________________?


aT1-Dew point temp; T2-Dry bulb temp; T3-Wet bulb temp

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bT1-Dew point temp; T2-Wet bulb temp; T3-Dry bulb temp

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cT1-Wet bulb temp; T2-Dry bulb temp; T3-Dew point temp

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dT1-Dry bulb temp; T2-Wet bulb temp; T3-Dew point temp

✓


View Answer T1-Dry bulb temp; T2-Wet bulb temp; T3-Dew point temp

In a binary system, separation is very efficient, when the relative volatility is_______________?


a1

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b> 1

✓


c< 1

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d0.5

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View Answer > 1

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