Related Questions

At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?
A 0
B 1
C ∞
As the reflux ratio in a distillation coloumn is increased from the minimum, the
A Slope of the operating line in stripping section decreases
B Number of plates decreases very slowly first and then more and more rapidly
C Total cost first decreases and then increases
D Liquid flow increases while the vapor flow decreases for a system
In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.
A 1.1 to 1.5
B 1.6 to 2
C 2.2 to 2.6
D 2.7 to 3
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 $$\frac{{3{\text{W}}l}}{{{\text{nb}}{{\text{t}}^2}}}$$
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.
A Total
B Minimum
C Operating
D Maximum permissible
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
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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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
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
What is the slope of the operating line in the rectifying section of a distillation coloumn?
A 0
B ∞
C > 1
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the
A Relative volatility is reasonably constant
B Mixture (to be separated) shows negative deviation from ideality
C Mixture (to be separated) shows positive deviation from ideality
D Multicomponent distillation is involved

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