Pressure differential maintained across a continuous rotary vacuum filter is in the range of _______________ mm Hg column?

Related Mcqs:

1. Speed of the drum of the rotary vacuum filter normally ranges from _____________ rpm?

   A. 0.1 to 2
   B. 5 to 7
   C. 3 to 8
   D. 8 to 15

2. 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

3. Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about _______________ mm Hg (referred to a 760 mm mercury barometer)?

   A. 250
   B. 450
   C. 650
   D. 750

4. A minimum clearance of about _______________ mm is maintained between the distillation column wall and the bubble cap?

   A. 19
   B. 38
   C. 67
   D. 95

5. In a continuous distillation column, the optimum reflux ratio ranges from _______________ times the minimum reflux ratio?

   A. 1.1 to 1.5
   B. 1.6 to 2
   C. 2.2 to 2.6
   D. 2.7 to 3

6. The operating pressure drop range in a bag filter is about ______________ mm water gauge?

   A. 50-150
   B. 5-10
   C. 500-1500
   D. 1500-2500

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. Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height?

   A. 4-8
   B. 17-34
   C. 52-68
   D. 88-105

9. In a distillation column, minimum clearance to be maintained between the overflow weir and the last row of the bubble caps is ______________ cms?

   A. 2.5
   B. 7.5
   C. 15
   D. 20

10. Height of the flights in the rotary drier is in the range of___________________?

    A. 0.08 to 0.12 d
    B. 0.02 to 0.05 d
    C. 0.2 to 0.5 d
    D. 0.5 to 0.6 d