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

Related Mcqs:

1. The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about _________________ mm of water column per metre height of packing?

   A. 1-5
   B. 20-40
   C. 100-150
   D. 1000-1500

2. In packed absorption tower, onset of flooding usually occurs at a pressure drop of about ______________ mm of water column per metre height of packing?

   A. 25-50
   B. 50-75
   C. 200-250
   D. 750-1000

3. At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure____________________?

   A. Increases
   B. Decreases
   C. Remain same
   D. May increase or decrease depending upon the solubility of the gas in the liquid

4. 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

5. 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

6. The practical representative values of HETP for a number of commercial operations lies within a range of ______________ metre?

   A. 0.1-0.2
   B. 0.2-0.5
   C. 0.4-0.9
   D. 1.2-1.5

7. Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as_________________?

   A. Δp = G
   B. Δp = G0.5
   C. Δp = G2
   D. Δp = 1/G0.6

8. The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about ______________ times the design pressure?

   A. 1.5 to 2
   B. 3 to 4
   C. 4 to 5
   D. > 5

9. Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than ______________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop?

   A. 25
   B. 50
   C. 75
   D. 150

10. 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