__________ is the determining factor for the number of bubble caps to be used pe

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Question
__________ is the determining factor for the number of bubble caps to be used per tray.
Options
A. Permissible slot velocity
B. Tray diameter
C. Liquid load
D. Vapor load

Correct Answer

Permissible slot velocity

Process Equipment and Plant Design problems

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4. Diameter of the seive tray column is determined by the
Options
A. lower limit of vapour velocity.
B. upper limit of the vapour velocity.
C. hole diameter of the seive tray.
D. height of the plate spacing.

5. A perforated plate has holes of diameter d_n arranged in a pitch p_h. Each hole has a tube of I.D. d_t passing through it. The ligament efficiency is given by
Options
A. (p_h - d_h)/p_h
B. (p_h - d_h . d_t/2)/p_h
C. (p_h - d_t)/p_h
D. (p_h - d_h)/d_h

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
Options
A. increases
B. decreases
C. remains same
D. may increase or decrease depending upon the solubility of the gas in the liquid

7. If 'D' is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of
Options
A. D/2 or minimum 2" to 5D.
B. D/5 or minimum 2" to 5D.
C. D/5 or minimum 2" to D.
D. none of these.

8. Weep holes provided in the plates of a distillation column
Options
A. facilitate draining out liquid from a tray when the unit is not in operation.
B. are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid.
C. must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation.
D. all (a), (b) and (c).

9. for a Tee (used as elbow, entering branch) would be
Options
A. less than that for Tee (used as elbow, entering run).
B. more than that for Tee (used as elbow, entering run).
C. around 90.
D. both (b) and (c).

10. Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.
Options
A. 16
B. 19
C. 28
D. 38

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