Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the_______________?

Related Mcqs:

1. Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling ?

   A. CO2
   B. SO2
   C. NH3
   D. None of these

2. An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by______________?

   A. An increase in liquid viscosity
   B. An increase in relative volatility for rectification columns
   C. Decrease in gas solubility for absorbers
   D. All A., B. and C.

3. 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

4. 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

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

   A. 0
   B. ∞
   C. > 1
   D. < 1

6. 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

7. For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is_________________?

   A. d1/(d1 + d2)
   B. d2/(d1 + d2)
   C. (d1 + d2)/d1
   D. (d1 + d2)/d2

8. 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

9. Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower ?

   A. Size, shape, orientation and surface of the packing particles
   B. Density and viscosity of fluids
   C. Fluid flow rates
   D. All A., B. and C.

10. Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the_____________________?

    A. Sensible heat differences are small, because the temperature changes from tray to tray is small
    B. Trouton’s rule is applicable
    C. Liquid/vapor loading across the column remains constant
    D. All A., B. and C.