Process Equipment and Plant Design problems
- 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
Correct Answer: all (a), (b) and (c).
- 2. 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 Discuss
Correct Answer: 0
- 3.
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
Correct Answer: 25 and 60
- 4. 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
Correct Answer: 23
- 5. 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
Correct Answer: can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less.
- 6. __________ closure is the weakest enclosure for cylindrical vessels.
Options- A. Hemispherical
- B. Torispherical
- C. Conical or flat plate
- D. Elliptical Discuss
Correct Answer: Conical or flat plate
- 7. 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
Correct Answer: 1.5
- 8. In a pressure vessel containing multiple openings of various dimensions at different parts, stress concentration at the edges of the opening is maximum which becomes negligibly small beyond the area covered by __________ times the hole diameter.
Options- A. two
- B. five
- C. ten
- D. twenty Discuss
Correct Answer: two
- 9. Pick out the wrong statement.
Options- A. Lug supports are less expensive than other type of supports.
- B. A pipe is differentiated from a tube by the fact that a pipe has a greater wall thickness compared to the tube.
- C. A reducer is used to change the direction of a pipe in a straight run.
- D. The method of fixing tubes to a tube sheet by expanding is called 'tube rolling'. Discuss
Correct Answer: A reducer is used to change the direction of a pipe in a straight run.
- 10. Which of the following efficiencies can be greater than 100%?
Options- A. Overall plate efficiency.
- B. Murphree plate efficiency.
- C. Point efficiency.
- D. None of these. Discuss
Correct Answer: Murphree plate efficiency.
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