Related Questions

A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,
A Composition of vapors and that of liquid do not vary throughout the column
B Reboiler load and condenser load are minimum
C The top and bottom compositions are unchanged with and without total reflux
D The top and bottom compositions correspond to the maximum enrichment available
In leaf springs, the maximum bending stress developed in the plates is (where W = Load acting on the spring, $$l$$ = Span of the spring, n = Number of plates, b = Width of plates and t = Thickness of plates)
A $$\frac{{{\text{W}}l}}{{{\text{nb}}{{\text{t}}^2}}}$$
B $$\frac{{3{\text{W}}l}}{{2{\text{nb}}{{\text{t}}^2}}}$$
C $$\frac{{2{\text{W}}l}}{{{\text{nb}}{{\text{t}}^2}}}$$
D $$\frac{{3{\text{W}}l}}{{{\text{nb}}{{\text{t}}^2}}}$$
The minimum number of theoretical plates is required for achieving a given separation in distillation column with
A No reflux
B Total reflux
C Zero reflux ratio
D Minimum reflux ratio
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will
A Increase
B Decrease
C Remains same
D Depend on saturated boiling point; may increase or decrease
When the feed to a distillation column is a saturated liquid, slope of the feed line is
A Zero
B Unity
C Infinity
D None of these
What is the slope of the feed line, if the feed to a distillation column is a saturated liquid?
A 0
B ∞
C > 1
At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?
A 0
B 1
C ∞
Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for
A Constant molal overflow
B Total reflux
C Constant relative volatility
D All of the above
Weep holes provided in the plates of a distillation column
A Facilitate draining out liquid from a tray when the unit is not in operation
B Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid
C Must be large enough (usually $${\frac{1}{4}^{''}}$$ to $${\frac{5}{8}^{''}}$$ dia) to prevent plugging but should not deliver excessive amount of fluid during operation
D All of the above
The-relative volatility for separation of a non-ideal binary mixture by distillation should be
A 0
B 1
C > 1

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