Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is _______________ the liquid head available in the downcomer?

Related Mcqs:

1. In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as ___________________ ?

   A. KG = 1/KG + m/KL
   B. 1/KG = 1/KG + m/KL
   C. 1/KG = 1/KL + m/KG
   D. KG = 1/KL + m/KG

2. 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

3. 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

4. Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty ?

   A. Sieve plate column
   B. Bubble cap column
   C. Randomly packed column
   D. Wetted wall column

5. The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is_______________________?

   A. 100
   B. 10
   C. 5
   D. 1

6. Bound moisture is that liquid which exerts an equilibrium vapor pressure ________________ that of the pure liquid at the given temperature ?

   A. Less than
   B. More than
   C. Equal to
   D. Either A. or B.; depends on the solid

7. For contacting a highly soluble gas with a liquid ____________________?

   A. Bubble the gas through liquid
   B. Spray the liquid on gas stream
   C. Either A. or B. would suffice
   D. None of these

8. At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid _______________ that in dry packed tower ?

   A. Is greater than
   B. Is lower than
   C. Is same as
   D. Cannot be predicted as data are insufficient

9. Under conditions of flooding in packed tower, the gas pressure drop___________________?

   A. Decreases rapidly
   B. Increases rapidly
   C. Remain constant
   D. Is maximum

10. _____________ is the temperature at which a gas-vapor mixture becomes saturated, when cooled at constant total pressure out of contact with a liquid ?

    A. Dew point
    B. Bubble point
    C. Dry bulb temperature
    D. Wet bulb temperature