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

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. 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.

3. 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

4. In an absorber, HETP does not vary with the____________________?

   A. Flow rate of liquid
   B. Flow rate of gas
   C. Type and size of packing
   D. None of these

5. On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in______________________?

   A. Greater degree of separation with a fixed number of trays
   B. Increased reboiler load
   C. Increased reflux ratio
   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 a single component absorber, the operating line is straight only when plotted in term of ______________ units?

   A. Partial pressure
   B. Mole ratio
   C. Mole fraction
   D. None of these

8. When both the fluids flow concurrently in an absorber, the slope of the operating line is____________________?

   A. -ve
   B. +ve
   C. 1
   D. -1

9. If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively ?

   A. [xD/(RD + 1)], [RD/(RD + 1)]
   B. [RD/(RD + 1)], [xD/(xD + 1)]
   C. [xD/(RD + 1)], [(RD + 1)/RD]
   D. None of these

10. If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is___________________?

    A. L/G
    B. G/L
    C. Always < 1
    D. None of these