Discussion
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- Question
Which of the following packing materials provides for maximum mass transfer?
Options- A. Lessig rings.
- B. Raschig rings.
- C. Cross-partition rings.
- D. All give the same value.
- Correct Answer
- Cross-partition rings.
- 1. Pick out the wrong statement.
Options- A. In practical operation, distillation towers having diameter 3-6 metres equipped with bubble cap (round) size of 15 cms are used.
- B. Height of packing in a packed tower is about 3 times the column diameter for raschig rings and about 5 to 10 times the column diameter for saddle packing.
- C. In a seive tray, the minimum hole diameter is equal to the tray thickness.
- D. In a stainless steel seive tray, the minimum hole diameter is equal to 10 times the plate thickness. Discuss
- 2. Fouling factor must be included in the calculation of over all design heat transfer coefficient, when the liquid
Options- A. containing suspended solids flows at low velocity.
- B. containing suspended solids flows at high velocity.
- C. is highly viscous.
- D. is of high specific gravity. Discuss
- 3. Lug support is meant for supporting __________ vessels.
Options- A. large horizontal cylindrical
- B. tall but empty
- C. small
- D. thick walled tall Discuss
- 4. Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have __________ roofs.
Options- A. conical
- B. flat
- C. floating
- D. fixed Discuss
- 5. A cylinderical pressure vessel of volume 6 ?m3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to
Options- A. 5 mm
- B. 6 mm
- C. 8 mm
- D. 10 mm Discuss
- 6. Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as
Options- A. d = 1.1 t
- B. d = 1.6 t
- C. d = 1.5 t
- D. 3t Discuss
- 7. The ratio of linear stress to linear strain is termed as the
Options- A. modulus of elasticity
- B. modulus of rigidity
- C. bulk modulus
- D. none of these Discuss
- 8. Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about __________ mm.
Options- A. 10
- B. 50
- C. 100
- D. 150 Discuss
- 9. __________ head is the most economical for cylindrical vessels designed for operating at high pressure (> 15 atm.).
Options- A. Hemispherical
- B. Dished
- C. Ellipsoidal
- D. Conical Discuss
- 10. The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called
Options- A. downcomer liquid seal
- B. static submergence
- C. skirt clearance
- D. none of these Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: In a stainless steel seive tray, the minimum hole diameter is equal to 10 times the plate thickness.
Correct Answer: containing suspended solids flows at low velocity.
Correct Answer: small
Correct Answer: floating
Correct Answer: 10 mm
Correct Answer: d = 1.6 t
Correct Answer: modulus of elasticity
Correct Answer: 100
Correct Answer: Ellipsoidal
Correct Answer: static submergence
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