Related Mcqs:

1. Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the_______________?

   A. Flow rates of each fluid
   B. Type and size of packing
   C. Concentration of each fluid
   D. All A, B. & C.

2. Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height?

   A. 4-8
   B. 17-34
   C. 52-68
   D. 88-105

3. Slope of counter-current flow rotary drier is in the range of ____________ meter/metre?

   A. 0 to 0.08
   B. 0 to 0.8
   C. 0 to 1.5
   D. 0 to 2.2

4. Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than ______________ of the head?

   A. 6% of I.D.
   B. 3 times the thickness
   C. Either A. or B., whichever is larger
   D. Either A. or B., whichever is smaller

5. In packed absorption tower, onset of flooding usually occurs at a pressure drop of about ______________ mm of water column per metre height of packing?

   A. 25-50
   B. 50-75
   C. 200-250
   D. 750-1000

6. At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure____________________?

   A. Increases
   B. Decreases
   C. Remain same
   D. May increase or decrease depending upon the solubility of the gas in the liquid

7. The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about _________________ mm of water column per metre height of packing?

   A. 1-5
   B. 20-40
   C. 100-150
   D. 1000-1500

8. Value of Peclet number = ∞, is the representative of___________________?

   A. Laminar flow
   B. Complete back mixing
   C. Plug flow
   D. Eddy diffusivity = 0

9. Value of Peclet number = 0, is the representative of ____________________?

   A. Laminar flow
   B. Complete back mixing
   C. Plug flow
   D. Eddy diffusivity = 0

10. Frame thickness in the plate and frame filter press is normally in the range of ______________ inches?

    A. 0.25 to 4
    B. 0.25 to 8
    C. 1 to 5
    D. 1 to 12