Discussion
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- Question
For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is
Options- A.
- B.
- C.
- D.
- Correct Answer
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- 1. In a shell and tube heat exchanger, the clearance of the tube is generally
Options- A. not less than one-fourth of the tube diameter or 3/16".
- B. more than the tube diameter.
- C. equal to the tube diameter.
- D. more in case of triangular pitch as compared to the square pitch tube layout. Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to
Options- A. ?
- B. 1
- C. 20.8
- D. 2 Discuss
- 7. Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.
Options- A. It is unsuitable for concentrating those liquids, which form a scale or deposit salt.
- B. It is suitable for process, in which the final product is a liquor instead of solid.
- C. Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres.
- D. Liquor flows inside the tube, while the steam is outside submerging the tube. Discuss
- 8. For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell
Options- A. decreases upwards.
- B. increases upwards.
- C. remains same throughout.
- D. may decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell. Discuss
- 9. Maximum acceptable total liquid gradient over a tray is about __________ mm.
Options- A. 5.5
- B. 12.5
- C. 30.5
- D. 45.5 Discuss
- 10. The dust collection efficiency of a cyclone separator
Options- A. decreases with increase in gas flow rate.
- B. is inversely proportional to the mass of the dust particle.
- C. is directly proportional to the radius of the dust particle path.
- D. none of these. Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: not less than one-fourth of the tube diameter or 3/16".
Correct Answer: 5
Correct Answer: all multipass
Correct Answer: tubes to avoid the expansion of high pressure shell construction.
Correct Answer: 650
Correct Answer: 1
Correct Answer: Liquor flows inside the tube, while the steam is outside submerging the tube.
Correct Answer: decreases upwards.
Correct Answer: 12.5
Correct Answer: none of these.
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