Which of the following same diameter columns gives lowest pressure drop per unit height ?

Related Mcqs:

1. Which of these columns incurs the lowest pressure drop ?

   A. Packed column (with stacked packing)
   B. Packed column (with dumped packing)
   C. Bubble plate column
   D. Pulse column

2. H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in meters) corresponding to an operating line given by, y = 5x + 0.001 is ______________________?

   A. 2.0
   B. 1.56
   C. 1.0
   D. 0.56

3. For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?

   A. G/(FG . a)
   B. FG/(G . a)
   C. (G . a)/FG
   D. L/(FG . G)

4. In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalent to a theoretical plate HTUOG = overall gas phase height of a transfer unit) ?

   A. Straight
   B. Parallel
   C. Both A. & B.
   D. Neither A. nor B.

5. The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3)_________________?

   A. 500
   B. 1200
   C. 900
   D. 800

6. The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3) ?

   A. 500
   B. 1200
   C. 900
   D. 800

7. In distillation columns, the number of bubble caps per tray primarily depends upon the_______________________?

   A. Allowable liquid velocity
   B. Allowable gas velocity
   C. Allowable gas and liquid velocities
   D. Feed composition

8. Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty ?

   A. Grid tray tower
   B. Perforated tray tower
   C. Wetted wall tower
   D. Bubble cap tower

9. Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in ______________ tower?

   A. Wetted wall
   B. Bubble cap
   C. Perforated tray
   D. Packed

10. Diameter to height ratio for a raschig ring is_____________________?

    A. 1
    B. 0.5
    C. 2
    D. 8