A. No reflux
B. Total reflux
C. Zero reflux ratio
D. Minimum reflux ratio
Related Mcqs:
- According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the column ?
A. 5
B. 9
C. 12
D. 28 - At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?
A. 0
B. 1
C. ∞
D. < 1 - 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 A., B. and C. - For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will_____________________?
A. Increase
B. Decrease
C. Remain same
D. Data insufficient, can’t be predicted - 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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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 - Fenske 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. Multi-component distillation is involved - 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 - 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 - Packed column distillation is limited to the column _____________ metres?
A. Height < 6
B. Diameter < 0.6
C. Both A. & B.
D. Neither A. nor B. - Minimum reflux ratio in a distillation column results in_____________________?
A. Optimum number of trays
B. Minimum reboiler size
C. Maximum condenser size
D. Minimum number of trays
