Discussion
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- Question
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.
- Correct Answer
- is always less than arithmetic average value.
- 1. 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
- 2. Skirt support is the most suitable for supporting __________ vessels.
Options- A. small horizontal
- B. large horizontal
- C. tall vertical
- D. thick walled Discuss
- 3. In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of
Options- A. 1000
- B. 3000
- C. 5000
- D. 10000 Discuss
- 4. The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.
Options- A. 0.1-0.2
- B. 0.2-0.5
- C. 0.4-0.9
- D. 1.2-1.5 Discuss
- 5. Of the pressure vessels, with same thickness but different diameters, which one withstands higher pressure?
Options- A. Larger dia vessel.
- B. Smaller dia vessel.
- C. Larger dia long vessel.
- D. Strength of the vessel is same irrespective of the diameter. Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Process Equipment and Plant Design problems
Search Results
Correct Answer: high viscosity liquids (> 600 poise).
Correct Answer: tall vertical
Correct Answer: 10000
Correct Answer: 0.4-0.9
Correct Answer: Smaller dia vessel.
Correct Answer: large diameter tanks.
Correct Answer: excessive liquid gradient over the tray.
Correct Answer: Weir height for a bubble cap plate column is the same as that for a seive plate column.
Correct Answer: circumferential pipewall tension.
Correct Answer: orifice
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