Process Equipment and Plant Design problems
- 1. 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
Correct Answer: either (a) or (b)
- 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
Correct Answer: all (a), (b) & (c).
- 3. 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
Correct Answer: 2.5-3.0
- 4. Maximum plate efficiency is achieved in case of __________ flow.
Options- A. split
- B. cross
- C. cascade
- D. reverse Discuss
Correct Answer: cross
- 5. 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
Correct Answer: 0 to 0.08
- 6. __________ 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
Correct Answer: Packed
- 7. 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
Correct Answer: 3.8
- 8. 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
Correct Answer: 1.25
- 9. 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
Correct Answer: both (b) and (c)
- 10. The normal range of velocity of water in pipes is __________ m/sec.
Options- A. 0.1-0.5
- B. 1-2
- C. 10-50
- D. 15-30 Discuss
Correct Answer: 1-2
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