Category: Process Equipment and Plant Design

A. 0.3 to 0.5 d
B. 0.1 to 0.2 d
C. 0.65 to 0.85 d
D. 0.95 d

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. 5 mm
B. 6 mm
C. 8 mm
D. 10 mm

A. Providing a higher skirt clearance or a higher weir
B. Decreasing the number of rows of caps through which the liquid flows or by decreasing the
velocity of liquid flow past the caps or by reducing the distance along the tray through which
the liquid must flow
C. Using split flow, radial flow or cascade flow for column diameter large than 4 ft
D. All A., B. and C.

A. Ultimate stress
B. Yield stress
C. Elastic limit
D. Breaking stress

A. Less than
B. 1.25-1.50 times
C. 2.5 times
D. one-fourth of

A. Increases capacity
B. Increases economy
C. Does not affect the capacity
D. Both B. & C.

A. Not less than one-fourth of the tube diameter or 3/16″
B. More than the tube diameter
C. Equal to the tube diameter
D. More in case of triangular pitch as compared to the square pitch tube layout

A. 0.1 to 0.3
B. 0.6 to 0.7
C. 0.85 to 0.95
D. 1.5 to 2

A. If sufficient residence time (around 8 seconds) is not provided to the downcoming liquid in
the downcomer, it may entrain some vapour
B. The liquid head in the downcomer should not be greater than one half the plate spacing to
avoid flooding
C. The discharge end of the downcomer must project far enough into the tray liquid so that no
gas bubbles can enter the open end and by pass the bubble caps
D. None of these