A. The overhead product is minimum
B. Both the operating lines coincide with diagonal
C. Both A. and B.
D. Neither A. nor B.
Related Mcqs:
- In McCabe-Thiele method, at infinite reflux ratio___________________?
A. Number of plates is maximum
B. Overhead product is maximum
C. Both the operating lines coincide with the diagram
D. None of these - 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 - In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions: (i) Reflux stream is completely liquid and is at its bubble point. (ii) Reflux stream is below its bubble point ?
A. Condenser and reboiler loads are the same in both the cases
B. Reboiler load is the same in both the cases but condenser load is higher in case (ii)
C. Condenser load is the same in both the cases but reboiler load is higher in case (ii)
D. Both condenser and reboiler loads are higher in case (ii) as compared to case (i) - If f = moles of vapour present per mole of feed, then the slope of feed line is (McCabe- Thiele method) ________________________?
A. (1 – f)/f
B. – (f – 1)/f
C. -1/f
D. -f/(1 – f) - McCabe-Thiele method of binary distillation does not assume that the__________________?
A. Sensible heat changes are negligible compared with latent heat changes
B. Molar latent heats of all components are equal
C. Heat of mixing is negligible
D. None of these - McCabe-Thiele method________________?
A. Uses molal units for material and energy balance
B. Uses weight fractions to express liquid and vapour composition
C. Can use any type of units
D. Is more accurate than Ponchon-Savarit method - Pick out the correct relationship. (Where, Ri = internal reflux ratio Ro = external reflux ratio.) ?
A. (1 + Ro) = Ro/Ri
B. (1 – Ro) = Ro/Ri
C. (1 + Ri) = Ro/Ri
D. (1 – Ri) = Ro/Ri - If Rm is the minimum reflux ratio, the optimum reflux ratio may be around _________________ Rm ?
A. 1.2 to 1.5
B. 2.5 to 3
C. 3 to 4
D. 5 - In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as_____________________?
A. Ri = Re/(1 – Re)
B. Ri = (1 – Re)/Re
C. Ri = Re
D. Ri = Re/(1 + Re) - What is the reflux ratio at total reflux ?
A. Zero
B. Infinity
C. Unity
D. Data insufficient
