Discussion
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- Question
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
- Correct Answer
- 0.8
- 1. 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
- 2. Width and depth of grooves in the tube sheet holes normally are __________ inch respectively.
Options- A.
- B.
- C.
- D.
Discuss
- 3. 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
- 4. 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. Discuss
- 5. 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
- 6. 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
- 7. Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.
Options- A. less
- B. more
- C. same
- D. either (a) or (b); no generalisation can be made Discuss
- 8. In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.
Options- A. 1/10-1/15th
- B. 1/5-1/10th
- C. 1/20-1/30th
- D. 1/2 to 1/4th Discuss
- 9. __________ of water makes it a widely used coolant in heat exchangers.
Options- A. Low corrosiveness
- B. Low dirt factor
- C. High specific heat
- D. Low viscosity Discuss
- 10. Pick out the wrong statement.
Options- A. Plate efficiency increases with increase in superficial vapour velocity till entrainment limit.
- B. Increase in depth of the liquid about the slots increases the plate efficiency, particularly if the liquid depth is < 1".
- C. Too small a plate spacing can cause a low efficiency, if the vapour velocity is greater than the allowable value.
- D. none of these. Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: 1/D5
Correct Answer:
Correct Answer: orifice
Correct Answer: circumferential pipewall tension.
Correct Answer: Weir height for a bubble cap plate column is the same as that for a seive plate column.
Correct Answer: less
Correct Answer: more
Correct Answer: 1/10-1/15th
Correct Answer: High specific heat
Correct Answer: none of these.
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