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

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

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

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


aPartial condenser

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bTotal condenser

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cReboiler

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dBoth B. and C

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View Answer Both B. and C

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


aDecrease in air temperature

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bIncrease in air humidity

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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.

Packed column distillation is limited to the column _____________ metres?


aHeight < 6

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bDiameter < 0.6

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

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


aSolids are drained to the same extent

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bRatio of the insoluble to solution is constant

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cBoth A. & B.

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dNeither A. nor B.

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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

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b1/μ

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c√μ

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dμ2

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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

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bHigh pressure drop of the gas

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cDifficulty in its fabrication

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dNone of these

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


a(1 + Ro) = Ro/Ri

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b(1 – Ro) = Ro/Ri

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c(1 + Ri) = Ro/Ri

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d(1 – Ri) = Ro/Ri

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View Answer (1 + Ro) = Ro/Ri

The humid volume may be increased by increasing the____________________?


aTemperature at constant humidity

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bHumidity at constant temperature

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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.

Tower diameter may be decreased by__________________?


aUsing higher reflux ratio

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bUse of increased tray spacing

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cIncreasing the liquid flow rate

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dIncreasing the vapour flow rate

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