Chemical Engineering MCQs

Page No. 671

Steam distillation is not recommended to be used, if the _____________________?


aAzeotropic mixture is to be separated and the final product is miscible with water


bLiquids decompose, if distilled directly at atmospheric pressure


cMaterial cannot be distilled by indirect heating even under low pressure, because of the high boiling temperature


dMaterial to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature



Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele’s method ?


aPartial condenser


bTotal condenser


cReboiler


dBoth B. and C


View Answer Both B. and C

During constant rate period, the rate of drying decreases with the______________________?


aDecrease in air temperature


bIncrease in air humidity


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Packed column distillation is limited to the column _____________ metres?


aHeight < 6


bDiameter < 0.6


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

In case of constant underflow extraction operation, the _______________________ at all solute concentration?


aSolids are drained to the same extent


bRatio of the insoluble to solution is constant


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

According to Poiseuille’s law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)___________________?


aμ


b1/μ


c√μ


dμ2


View Answer 1/μ

Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the_________________?


aHigh evaporation losses of water


bHigh pressure drop of the gas


cDifficulty in its fabrication


dNone of these



Pick out the correct relationship. (Where, Ri = internal reflux ratio Ro = external reflux ratio.) ?


a(1 + Ro) = Ro/Ri


b(1 – Ro) = Ro/Ri


c(1 + Ri) = Ro/Ri


d(1 – Ri) = Ro/Ri


View Answer (1 + Ro) = Ro/Ri

The humid volume may be increased by increasing the____________________?


aTemperature at constant humidity


bHumidity at constant temperature


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Tower diameter may be decreased by__________________?


aUsing higher reflux ratio


bUse of increased tray spacing


cIncreasing the liquid flow rate


dIncreasing the vapour flow rate



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