A. Less than
B. More than
C. Same as
D. Either more or less (depending upon relative volatility
Related Mcqs:
- What is the slope of the operating line in the stripping section of a distillation column ?
A. 0
B. ∞
C. > 1
D. < 1 - 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 - Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about ______________ mm?
A. 10
B. 50
C. 100
D. 200 - Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of ______________ times the paddle diameter?
A. 0.1 to 0.25
B. 0.3 to 0.5
C. 0.5 to 0.6
D. 0.65 to 0.80 - In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones; because the smaller diameter tubes ______________?
A. Are easier to clean
B. Are less prone to fouling
C. Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
D. None of these - 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 - In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about _______________ cms?
A. 10
B. 20
C. 30
D. 35 - 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 - Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or ______________ times the column diameter, whichever is lower?
A. 2.5-3.0
B. 5-7.5
C. 10-12.5
D. 15-20 - In sieve plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally ______________ times the hole diameter to give the required hole area?
A. 0.5 to 1.5
B. 2.5 to 4.0
C. 5 to 10
D. 10 to 15
