Discussion
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- Question
Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about __________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate.
Options- A. 2
- B. 1/2
- C. 4
- D. 8
- Correct Answer
- 8
- 1. Lug support is
Options- A. the most suitable for thick vertical vessel.
- B. same as bracket support.
- C. provided usually for vessels of much smaller height than skirt supported vessels.
- D. all (a), (b) and (c). Discuss
- 2. Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger
Options- A. permits the use of less tubes in a given shell diameter.
- B. facilitates comparatively easier external cleaning because of large clearance.
- C. permits the use of more tubes in a given shell diameter.
- D. both (b) and (c). Discuss
- 3. Pick out the correct statement.
Options- A. When highly corrosive fluids are to be handled, the plate towers prove to be cheaper and easier to construct than packed tower.
- B. Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency.
- C. The pressure drop through the packed towers is generally more than the pressure drop through plate towers designed for same duty.
- D. none of these. Discuss
- 4. Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than __________ kilolitres.
Options- A. 20
- B. 30
- C. 45
- D. 85 Discuss
- 5. Which of the following material is seldom used for pressure vessel construction?
Options- A. Rimmed still
- B. Mild steel
- C. Killed steel
- D. Semi-killed steel Discuss
- 6. The operating pressure drop range in a bag filter is about __________ mm water gauge.
Options- A. 50-150
- B. 5-10
- C. 500-1500
- D. 1500-2500 Discuss
- 7. Speed of the drum of the rotary vacuum filter normally ranges from __________ rpm.
Options- A. 0.1 to 2
- B. 5 to 7
- C. 3 to 8
- D. 8 to 15 Discuss
- 8. A stuffing box is used for
Options- A. absorbing the contraction/expansion of pipeline due to temperature changes.
- B. prevention of fluid leakage around moving parts.
- C. facilitating smooth opening and closing of a valve.
- D. reducing the resistance of fluid flow. Discuss
- 9. Pick out the wrong statement.
In an agitated vertical cylinderical reaction vessel, the
Options- A. ratio of liquid depth to tank diameter (i.e. the filling ratio) recommended for most purposes is 1.
- B. filling ratio for dispersing gas in a liquid is 2 for sufficiently long contact period.
- C. flat bottom and conical bottom vessels have low agitation efficiency for agitation of heavy solids in liquids.
- D. dished bottom vessel has very high power consumption. Discuss
- 10. The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.
Options- A. 1-5
- B. 20-40
- C. 100-150
- D. 1000-1500 Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: permits the use of more tubes in a given shell diameter.
Correct Answer: Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency.
Correct Answer: 45
Correct Answer: Rimmed still
Correct Answer: 50-150
Correct Answer: 0.1 to 2
Correct Answer: prevention of fluid leakage around moving parts.
Correct Answer: dished bottom vessel has very high power consumption.
Correct Answer: 20-40
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