A. Lower limit of vapour velocity
B. Upper limit of the vapour velocity
C. Hole diameter of the sieve tray
D. Height of the plate spacing
A. 5.5
B. 12.5
C. 30.5
D. 45.5
A. 19
B. 38
C. 67
D. 95
A. From rolled strips formed into cylinders and seam-welded
B. By extrusion & casting into static and centrifugal molds
C. By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer
point and further reducing it by rolling gas drawing
D. Both B. and C.
A. d1/(d1 + d2)
B. d2/(d1 + d2)
C. (d1 + d2)/d1
D. (d1 + d2)/d2
A. Viscosity of the fluid
B. Density of the fluid
C. Total cost considerations (pumg cost plus fixed cost of the pipe)
D. None of these
A. 0.25
B. 0.50
C. 0.75
D. 1.25
A. Diameter of the bubble cap column
B. Diameter of the sieve plate column
C. Tray pressure drop
D. Residence time in the downcomer for the disengagement of entrained vapour
A. 50 to 100
B. 100 to 150
C. 250 to 500
D. 600 to 700
A. Equal to
B. More than
C. Less than
D. Either B. or C.; depends on maximum permissible internal pressure