Cylindrical shell thickness of rotary drier is generally _______________ mm?

Related Mcqs:

1. In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ?

   A. Z.H.ρ/L
   B. L/Z.H.ρ
   C. H.ρ/L
   D. Z.H/ρL

2. For a cylindrical vessel of moderate height, the weld joint efficiency for joints parallel to the cylindrical axis is given as 1.0; while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylindrical vessel, what value of weld joint efficiency should be used ?

   A. 0.8
   B. 0.9
   C. 1.0
   D. (0.8)0.5

3. Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is____________?

   A. More
   B. Less
   C. Same
   D. More or less depending upon the pressure & temperature inside the vessel and the nature of
   the fluid contained therein

4. For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell_________________?

   A. Decreases upwards
   B. Increases upwards
   C. Remains same throughout
   D. May decrease or increase upwards depending upon whether vacuum or positive pressure
   would be maintained inside the shell

5. In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of ________________ mm?

   A. 3-5
   B. 5-11
   C. 8-15
   D. 12-18

6. The wall thickness of thin cylindrical shell with hemispherical ends is ______________ that of the spherical ends?

   A. Equal to
   B. More than
   C. Less than
   D. Either B. or C.; depends on maximum permissible internal pressure

7. Height of the flights in the rotary drier is in the range of___________________?

   A. 0.08 to 0.12 d
   B. 0.02 to 0.05 d
   C. 0.2 to 0.5 d
   D. 0.5 to 0.6 d

8. Hold up of material in a operating rotary drier is in the range of___________________?

   A. 0.05 to 0.15
   B. 0.25 to 0.50
   C. 0.5 to 0.8
   D. 0.8 to 0.9

9. 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

10. The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally _____________ the tube wall thickness?

    A. Equal to
    B. Twice
    C. Four times
    D. Half