What is the slope of the operating line in the rectifying section of a distillation column ?

Related Mcqs:

1. The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is___________________?

   A. 0
   B. ∞
   C. 1
   D. Minimum

2. What is the slope of the operating line in the stripping section of a distillation column ?

   A. 0
   B. ∞
   C. > 1
   D. < 1

3. 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

4. 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

5. The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line) ?

   A. S1/S2
   B. S1.S2
   C. S2/S1
   D. 1/S1.S2

6. 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

7. 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

8. Theoretically calculated diameter of the stripping section of the continuous rectification column is ______________ that of the enriching section?

   A. Less than
   B. More than
   C. Same as
   D. Either more or less (depending upon relative volatility

9. In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the_______________?

   A. Liquid gradient on the tray
   B. Lower skirt clearance
   C. Lower static submergence
   D. Small downcomer liquid seal

10. In a distillation column, the minimum residence time for liquid in the downspout is about ______________ seconds?

    A. 1
    B. 8
    C. 80
    D. 180