Process Equipment and Plant Design problems
- 1. The minimum tray spacing in distillation column of diameter less than 3 ft is normally __________ inches.
Options- A. 6
- B. 18
- C. 24
- D. 34 Discuss
Correct Answer: 6
- 2. The safe distance of habitation from a hazardous chemical plant (TLV of its product < 1000 ppm) should be about __________ kms.
Options- A. 1
- B. 5
- C. 15
- D. 25 Discuss
Correct Answer: 25
- 3. Maximum allowable vapour velocity in a bubble cap tower is determined by the
Options- A. entrainment considerations.
- B. vapour density.
- C. diameter of the column.
- D. none of these. Discuss
Correct Answer: entrainment considerations.
- 4. Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency
Options- A. increases
- B. decreases
- C. remains same
- D. may increase or decrease depending upon the plate spacing Discuss
Correct Answer: increases
- 5. Pick out the wrong statement pertaining to a shell and tube heat exchanger.
Options- A. The minimum value of baffle spacing is 50 mm.
- B. The maximum value of baffle spacing is equal to the I.D. of the shell.
- C. The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these.
- D. Disk and doughnut baffle is the most commonly used baffle. Discuss
Correct Answer: Disk and doughnut baffle is the most commonly used baffle.
- 6. Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around
Options- A. 0.4-0.6
- B. 0.35-0.75
- C. 0.1-0.2
- D. 0.55-0.85 Discuss
Correct Answer: 0.1-0.2
- 7. The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is __________ stress.
Options- A. shear
- B. tensile
- C. compressive
- D. thermal Discuss
Correct Answer: thermal
- 8. For a given design of bubble cap, the number of bubble caps to be used per tray is set by the
Options- A. allowable gas velocity through the slots.
- B. plate spacing.
- C. diameter of the column.
- D. all (a), (b) and (c). Discuss
Correct Answer: allowable gas velocity through the slots.
- 9. Smoker's equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the
Options- A. relative volatility is close to one (e.g., separation of close boiling isomers).
- B. feed is not at its bubble point.
- C. number of equilibrium stages in only stripping section is to be calculated.
- D. number of equilibrium stages required is likely to be very small. Discuss
Correct Answer: relative volatility is close to one (e.g., separation of close boiling isomers).
- 10. Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if
Options- A. plain carbon steel and cast iron parts are used.
- B. wall thickness is > 30 mm.
- C. material of construction is high alloy steel.
- D. both(b) & (c). Discuss
Correct Answer: both(b) & (c).
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