Discussion
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- Question
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the
Options- A. liquid gradient on the tray.
- B. lower skirt clearance.
- C. lower static submergence.
- D. small downcomer liquid seal.
- Correct Answer
- liquid gradient on the tray.
- 1. Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.
Options- A. 16
- B. 19
- C. 28
- D. 38 Discuss
- 2.
for a Tee (used as elbow, entering branch) would be
Options- A. less than that for Tee (used as elbow, entering run).
- B. more than that for Tee (used as elbow, entering run).
- C. around 90.
- D. both (b) and (c). Discuss
- 3. Weep holes provided in the plates of a distillation column
Options- A. facilitate draining out liquid from a tray when the unit is not in operation.
- B. are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid.
- C. must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation.
- D. all (a), (b) and (c). Discuss
- 4. If 'D' is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of
Options- A. D/2 or minimum 2" to 5D.
- B. D/5 or minimum 2" to 5D.
- C. D/5 or minimum 2" to D.
- D. none of these. Discuss
- 5. At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure
Options- A. increases
- B. decreases
- C. remains same
- D. may increase or decrease depending upon the solubility of the gas in the liquid Discuss
- 6. Brass valves are usually made for pipe sizes __________ inches.
Options- A. ?1
- B. ?2
- C. >2.5
- D. >3.5 Discuss
- 7. Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer).
Options- A. 250
- B. 450
- C. 650
- D. 750 Discuss
- 8. High pressure fluid in a shell and tube heat exchanger should preferably be routed through the
Options- A. tubes to avoid the expansion of high pressure shell construction.
- B. shell side for smaller total pressure drop.
- C. shell side, if the flow is counter-current and tube side if the flow is co-current.
- D. shell side for large overall heat transfer co-efficient. Discuss
- 9. The LMTD correction factor (FT) is applied in __________ heat exchangers.
Options- A. 1-1 cocurrent
- B. double pipe
- C. all multipass
- D. all (involving liquid/liquid heat transfer) Discuss
- 10. The minimum shell thickness for tank ? 15 metres diameter is limited to __________ mm, for reasons of elastic stability.
Options- A. 2
- B. 5
- C. 10
- D. 15 Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: 19
Correct Answer: both (b) and (c).
Correct Answer: all (a), (b) and (c).
Correct Answer: D/5 or minimum 2" to 5D.
Correct Answer: remains same
Correct Answer: ?2
Correct Answer: 650
Correct Answer: tubes to avoid the expansion of high pressure shell construction.
Correct Answer: all multipass
Correct Answer: 5
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