Co-current absorbers are usually used when the gas to be dissolved in the liquid is ___________________?

Related Mcqs:

1. With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___________________?

   A. Decreases
   B. Remains unchanged
   C. Increases
   D. Decreases exponentially

2. When the gas to be dissolved in liquid is a/an ___________________ then normally co-current adsorber are used?

   A. Mixture of two gases
   B. Pure gas
   C. Ideal gas
   D. Sparingly soluble gas

3. Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is _________________________?

   A. 5.6 × 10-4
   B. 8.5 × 10-4
   C. 5.6 × 10-3
   D. 8.5 × 10-3

4. 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)

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. Which of the following is not fixed by the process requirements, in the design of absorbers ?

   A. Flow rate of the entering gas
   B. Composition of the entering liquid
   C. Terminal concentrations of gas stream
   D. None of these

8. Most important factor to be considered in the selection of packings for absorbers is the ______________ of packing?

   A. Size
   B. Durability
   C. Porosity
   D. Cost

9. Most important factor to be considered in the selection of packings for absorbers is the ______________ of packing?

   A. Size
   B. Durability
   C. Porosity
   D. Cost

10. For absorbers, high pressure drop results in___________________?

    A. Increased efficiency
    B. Decreased efficiency
    C. High operating cost
    D. Better gas liquid contact