In an absorber, HETP does not vary with the____________________?

Related Mcqs:

1. 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.

2. Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are ?

   A. 4
   B. 8
   C. 9
   D. 10

3. HETP is numerically equal to HTU, only when the operating line ______________________?

   A. Lies below the equilibrium line
   B. Lies above the equilibrium line
   C. And equilibrium lines are parallel
   D. Is far from the equilibrium line

4. In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG ______________ the absorption factor?

   A. Increases with increase in
   B. Is one at unity value of
   C. Both A. and B.
   D. Neither A. nor B.

5. The minimum liquid rate to be used in an absorber corresponds to an operating line_______________________?

   A. Of slope = 1
   B. Of slope = 0.1
   C. Tangential to the equilibrium curve
   D. None of these

6. The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is__________________?

   A. 0
   B. ∞
   C. -ve
   D. +ve

7. For an absorber, both equilibrium and operating line will be straight for _______________________?

   A. Concentrated solution and non-isothermal operation
   B. Dilute solution and non-isothermal operation
   C. Dilute solution and isothermal operation
   D. Concentrated solution and isothermal operation

8. Desirable value of absorption factor in an absorber is___________________?

   A. 1
   B. < 1
   C. > 1
   D. 0.5

9. In case of an absorber, the operating _______________?

   A. Line always lies above the equilibrium curve
   B. Line always lies below the equilibrium curve
   C. Line can be either above or below the equilibrium curve
   D. Velocity is more than the loading velocity

10. The operating line for an absorber is curved, when plotted in terms of _______________________?

    A. Mole fractions
    B. Mole ratios
    C. Partial pressure
    D. Mass fractions