Process Equipment and Plant Design problems
- 1. The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the
Options- A. equal sized reactors are the best.
- B. smaller reactor should come first.
- C. larger reactor should come first.
- D. none of these. Discuss
Correct Answer: smaller reactor should come first.
- 2.
for fully open gate valves would be
Options- A. much more than that for fully open globe valves.
- B. much less (say 2% than that for fully open globe valves).
- C. around 7.
- D. both (b) and (c). Discuss
Correct Answer: both (b) and (c).
- 3. Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method
Options- A. is more accurate in finding the number of equilibrium stages.
- B. accounts for the enthalpy changes in the process.
- C. facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method.
- D. all 'a', 'b' & 'c'. Discuss
Correct Answer: all 'a', 'b' & 'c'.
- 4. Generally, elliptical dished heads
Options- A. are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m2 .
- B. resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter.
- C. are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D.
- D. all (a), (b) and (c) Discuss
Correct Answer: all (a), (b) and (c)
- 5. A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the
Options- A. central dished section and corner torus section.
- B. corner torus section and central dished section.
- C. central dished section and straight flange section.
- D. straight flange section and corner torus section. Discuss
Correct Answer: central dished section and corner torus section.
- 6. LMTD correction factor is used in heat exchanger design for
Options- A. double pipe heat exchanger.
- B. multipass shell and tube heat exchanger.
- C. fouling fluids.
- D. counter flow of hot and cold fluids. Discuss
Correct Answer: multipass shell and tube heat exchanger.
- 7. With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.
Options- A. fixed charges initially
- B. running cost of cooling water for condenser
- C. vapour & liquid load both
- D. running cost of steam for reboiler Discuss
Correct Answer: fixed charges initially
- 8. The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is
Options- A. 0
- B. ?
- C. 1
- D. minimum Discuss
Correct Answer: ?
- 9. Vertical vessels are not supported by
Options- A. brackets
- B. skirts
- C. columns
- D. saddles Discuss
Correct Answer: saddles
- 10. Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter )
Options- A. 0.2 D
- B. 0.5 D
- C. 0.66 D
- D. 0.80 D Discuss
Correct Answer: 0.2 D
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