Related Questions

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
Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the
A Sensible heat differences are small, because the temperature changes from tray to tray is small
B Trouton's rule is applicable
C Liquid/vapor loading across the column remains constant
D All of the above
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
At what value of reflux ratio, number of theoretical plates in a distillation column is minimum?
A 0
B 1
C ∞
Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?
A Sorel-Lewis method
B McCabe-Thiele's method
C Ponchon-Savarit method
D None of these
Smoker's equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the
A Relative volatility is close to one (e.g., separation of close boiling isomers)
B Feed is not at its bubble point
C Number of equilibrium stages in only stripping section is to be calculated
D Number of equilibrium stages required is likely to be very small
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
At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.
A Operating
B Total
C Minimum
D Maximum permissible
For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams
A Increases
B Decreases
C Remains unaffected
D Passes through a maximum
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in
A Air
B Oxygen
C Either A or B
D Either A or C without gain or loss of heat

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