Discussion
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- Question
Maximum acceptable total liquid gradient over a tray is about __________ mm.
Options- A. 5.5
- B. 12.5
- C. 30.5
- D. 45.5
- Correct Answer
- 12.5
- 1. 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
- 2. 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
- 3. 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
- 4. 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.
Discuss
- 5. 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
- 6. 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
- 7. Accidents in chemical plants are mostly due to
Options- A. inadequate equipment design.
- B. faulty operating procedures.
- C. improper layout of the equipments.
- D. failure of equipments. Discuss
- 8. Steam is preferred to be used as a heating medium in heat exchangers, because of its
Options- A. low cost.
- B. high latent heat.
- C. non-corrosive condensate.
- D. high film co-efficient. Discuss
- 9. The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.
Options- A. working
- B. damaging
- C. allowable
- D. none of these Discuss
- 10. Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.
Options- A. The corrosive and fouling fluid should be preferably routed through the tubes.
- B. The viscous fluid should be routed through the shell side.
- C. Lower flow rate fluid should be routed through the shell side.
- D. Higher pressure fluid stream should be routed through the shell side. Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: decreases upwards.
Correct Answer: Liquor flows inside the tube, while the steam is outside submerging the tube.
Correct Answer: 1
Correct Answer:
Correct Answer: not less than one-fourth of the tube diameter or 3/16".
Correct Answer: none of these.
Correct Answer: faulty operating procedures.
Correct Answer: high latent heat.
Correct Answer: damaging
Correct Answer: Higher pressure fluid stream should be routed through the shell side.
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