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- Question
Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.
Options- A. Tube dia is 3-6 cms, while tube length in 3-6 metres.
- B. Steam is fed to the shell, whereas the liquor is filled inside the tube.
- C. Liquor level is maintained at l/3rd to 1/2 of the height of the tube.
- D. none of these.
- Correct Answer
- none of these.
- 1. 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
- 2. __________ 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
- 3. 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
- 4. 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
- 5. 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
- 6. In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.
Options- A. 0.5 to 1.5
- B. 2.5 to 4.0
- C. 5 to 10
- D. 10 to 15 Discuss
- 7. Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger?
Options- A. 75% cut segmental baffle.
- B. 25% cut segmental baffle.
- C. Orifice baffle.
- D. Disk and doughnut baffle. Discuss
- 8. In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube?
Options- A. Long tube vertical evaporator
- B. Short tube vertical evaporator
- C. Horizontal tube evaporator
- D. None of these Discuss
- 9. What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers?
Options- A. 6.5 cms
- B. 6.5 mm
- C. Equal to tube I.D
- D. Equal to tube O.D Discuss
- 10. Liquid gradient over the tray results due to the
Options- A. resistance offered to flow of liquids by caps & risers and the flow of gas.
- B. low gas velocity.
- C. large plate spacing.
- D. large reflux ratio. Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: none of these.
Correct Answer: High specific heat
Correct Answer: 1/10-1/15th
Correct Answer: more
Correct Answer: less
Correct Answer: 2.5 to 4.0
Correct Answer: 25% cut segmental baffle.
Correct Answer: Horizontal tube evaporator
Correct Answer: 6.5 mm
Correct Answer: resistance offered to flow of liquids by caps & risers and the flow of gas.
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