Discussion
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- Question
The wall thickness for a large high pressure pipeline is determined by the consideration of the
Options- A. axial tensile stress in the pipe.
- B. forces exerted by static and dynamic action at bends.
- C. circumferential pipewall tension.
- D. temperature stresses.
- Correct Answer
- circumferential pipewall tension.
- 1. Pick out the wrong statement about the design of seive plate column and the bubble cap column.
Options- A. The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns.
- B. Weir length for a bubble cap plate is the same as that for the seive plate.
- C. Weir height for a bubble cap plate column is the same as that for a seive plate column.
- D. Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate. Discuss
- 2. Back-trapping in a distillation column results due to
Options- A. low gas velocity.
- B. high gas velocity.
- C. excessive liquid gradient over the tray.
- D. low reflux ratio. Discuss
- 3. Column support for the roof of cylindrical storage tank must be provided for
Options- A. small diameter tanks.
- B. large diameter tanks.
- C. small diameter tall tanks.
- D. all tanks irrespective of their heights and diameters. Discuss
- 4. In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference
Options- A. is always less than arithmetic average value.
- B. is always more than arithmetic mean value and the geometric mean value.
- C. is always less than arithmetic mean value, but more than geometric mean value.
- D. may be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current. Discuss
- 5. Baffles may be eliminated for
Options- A. low viscosity liquids (< 200 poise).
- B. high viscosity liquids (> 600 poise).
- C. large diameter tanks.
- D. none of these. Discuss
- 6. The shell side pressure drop in a shell and tube heat exchanger is maximum for __________ baffle.
Options- A. disk and ring
- B. segmental
- C. orifice
- D. independent of the type of Discuss
- 7. Width and depth of grooves in the tube sheet holes normally are __________ inch respectively.
Options- A.
- B.
- C.
- D.
Discuss
- 8. For pipe flows, head is proportional to __________ at constant capacity (where D = pipe diameter ).
Options- A. 1/D
- B. 1/D2
- C. 1/D5
- D. D2 Discuss
- 9. For a cylinderical vessel of moderate height, the weld joint efficiency for joints parallel to the cylinderical 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 cylinderical vessel, what value of weld joint efficiency should be used?
Options- A. 0.8
- B. 0.9
- C. 1.0
- D. (0.8)0.5 Discuss
- 10. Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is
Options- 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. Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: Weir height for a bubble cap plate column is the same as that for a seive plate column.
Correct Answer: excessive liquid gradient over the tray.
Correct Answer: large diameter tanks.
Correct Answer: is always less than arithmetic average value.
Correct Answer: high viscosity liquids (> 600 poise).
Correct Answer: orifice
Correct Answer:
Correct Answer: 1/D5
Correct Answer: 0.8
Correct Answer: less
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