Chemical Engineering MCQs

Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

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hydrostatic head is required for refluxing the condensate.
only the function of condensation is to be carried out.
sub cooling of condensate is desired.
both the functions of condensation & sub cooling are carried out in a single unit.
✅ The correct answer is option D.

The LMTD correction factor (FT) is defined as the

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ratio of true temperature difference to the LMTD.
ratio of LMTD to the true temperature difference.
differenced of true temperature difference and the LMTD.
geometric mean of the true temperature difference and the LMTD.
✅ The correct answer is option A.

Smoker’s equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the

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relative volatility is close to one (e.g., separation of close boiling isomers).
feed is not at its bubble point.
number of equilibrium stages in only stripping section is to be calculated.
number of equilibrium stages required is likely to be very small.
✅ The correct answer is option A.