Discussion
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- Question
Maximum plate efficiency is achieved in case of __________ flow.
Options- A. split
- B. cross
- C. cascade
- D. reverse
- Correct Answer
- cross
- 1. Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or __________ times the column diameter, whichever is lower.
Options- A. 2.5-3.0
- B. 5-7.5
- C. 10-12.5
- D. 15-20 Discuss
- 2. In a vertical short tube evaporator (Calendria type), the
Options- A. tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used.
- B. area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube.
- C. liquor is inside the tube while the steam is outside the tube.
- D. all (a), (b) & (c). Discuss
- 3. In a multipass shell and tube heat exchanger, the problem of differential expansion between the shell and tube passes is taken care of by using a
Options- A. U-bend
- B. floating head tube sheet
- C. either (a) or (b)
- D. neither (a) nor (b) Discuss
- 4. Poisson's ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson's ratio for structural and pressure vessel steel may be taken as
Options- A. 0.01
- B. 0.3
- C. 0.75
- D. 0.95 Discuss
- 5. A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design
Options- A. only if the opening is on spherical vessel.
- B. only if the opening is on a vertical cylinderical vessel.
- C. only if the opening is on a horizontal cylinderical vessel.
- D. irrespective of the shape of the vessel. Discuss
- 6. Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.
Options- A. 0 to 0.08
- B. 0 to 0.8
- C. 0 to 1.5
- D. 0 to 2.2 Discuss
- 7. __________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids.
Options- A. Sieve plate
- B. Packed
- C. Bubble cap plate
- D. None of these Discuss
- 8. In case of plain carbon steel, butt welded joints are used for shell plate thickness ? __________ cms.
Options- A. 1.2
- B. 0.5
- C. 3.8
- D. 6.8 Discuss
- 9. Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.
Options- A. 1.25
- B. 1.75
- C. 2.5
- D. 3.5 Discuss
- 10. In distillation columns, bubble caps are held in place over trays by
Options- A. rivets
- B. a hold down bar
- C. bolts
- D. both (b) and (c) Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: 2.5-3.0
Correct Answer: all (a), (b) & (c).
Correct Answer: either (a) or (b)
Correct Answer: 0.3
Correct Answer: irrespective of the shape of the vessel.
Correct Answer: 0 to 0.08
Correct Answer: Packed
Correct Answer: 3.8
Correct Answer: 1.25
Correct Answer: both (b) and (c)
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