Discussion
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- Question
What is the value of 'q' for saturated vapor feed to a distillation column?(where q = fraction of the feed stream that is liquid.)
Options- A. 0
- B. 1
- C. <0
- D. > 1
- Correct Answer
- 0
- 1. Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the
Options- A. sensible heat differences are small, because the temperature changes from tray to tray is small.
- B. Trouton's rule is applicable.
- C. liquid/vapor loading across the column remains constant.
- D. all (a), (b) and (c). Discuss
- 2. In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for
Options- A. reducing scale deposition.
- B. increasing pressure drop.
- C. fixing the tubes.
- D. creating turbulence. Discuss
- 3. The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally __________ the tube wall thickness.
Options- A. equal to
- B. twice
- C. four times
- D. half Discuss
- 4. A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of
Options- A. 2
- B. 20.8
- C. 20.2
- D. none of these Discuss
- 5. For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.
Options- A. half
- B. twice
- C. thrice
- D. five times Discuss
- 6.
for 90° elbow (medium radius) and 90°square elbow would be respectively around
Options- A. 25 and 60
- B. 3 and 5
- C. 100 and 250
- D. 250 and 600 Discuss
- 7. For a 25 mm hole drilled in plates to be rivetted, the shank diameter of the rivet should be __________ mm.
Options- A. 25
- B. 23
- C. 26
- D. 27 Discuss
- 8. In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes
Options- A. are easier to clean.
- B. are less prone to fouling.
- C. can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less.
- D. none of these. Discuss
- 9. __________ closure is the weakest enclosure for cylindrical vessels.
Options- A. Hemispherical
- B. Torispherical
- C. Conical or flat plate
- D. Elliptical Discuss
- 10. In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around
Options- A. 0.5
- B. 1.5
- C. 2.5
- D. 3.5 Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: creating turbulence.
Correct Answer: twice
Correct Answer: 20.8
Correct Answer: thrice
Correct Answer: 25 and 60
Correct Answer: 23
Correct Answer: can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less.
Correct Answer: Conical or flat plate
Correct Answer: 1.5
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