A. 0
B. 1
C. 1
Related Mcqs:
- The slope of the feed line in distillation operation is given by (where, q = fraction of the feed stream that is liquid ?
A. -q
B. -q/(1-q)
C. -q/(q-1)
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
D. < 1 - Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 – 1.4 cp and relative volatility < 4) (where ε = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi) ?
A. η = 17 – 61.1 log μ
B. η = 24.6 (Δp/μ)
C. η = 1.66 – 0.25 log μ
D. η = 0.25 log μ – 1.67 - A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _______________ percent of the flooding velocity?
A. 45
B. 60
C. 80
D. 95 - Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele’s method, this method_________________?
A. is more accurate in finding the number of equilibrium stages
B. accounts for the enthalpy changes in the process
C. Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in
this method
D. All A, B. & C. - Vapor velocity in a distillation column for non-foaming mixture is in the range of ______________ times the flooding velocity?
A. 0.1 to 0.3
B. 0.6 to 0.7
C. 0.85 to 0.95
D. 1.5 to 2 - In a distillation column, the minimum residence time for liquid in the downspout is about ______________ seconds?
A. 1
B. 8
C. 80
D. 180 - In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed _______________________ of the column diameter?
A. 1/10-1/15th
B. 1/5-1/10th
C. 1/20-1/30th
D. 1/2 to 1/4th - The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is ________________ cms?
A. 5
B. 15
C. 7.5
D. 50 - Souders Brown equation given by, U = Kv √(ρl – ρv)/ρv, is used for the calculation of the ______________ in a continuous distillation column?
A. Diameter of the bubble cap column
B. Diameter of the sieve plate column
C. Tray pressure drop
D. Residence time in the downcomer for the disengagement of entrained vapour
