Process Equipment and Plant Design problems
- 1. In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.
Options- A. 1.1 to 1.5
- B. 1.6 to 2
- C. 2.2 to 2.6
- D. 2.7 to 3 Discuss
Correct Answer: 1.1 to 1.5
- 2. For a cylinderical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness?
Options- A. hemispherical
- B. ellipsoidal (2 : 1)
- C. conical
- D. flat plate Discuss
Correct Answer: ellipsoidal (2 : 1)
- 3. Friction factor for turbulent flow in a new pipe is given by
Options- A.
- B.
- C. f = 0.22 NRe0.5
- D.
Discuss
Correct Answer:
- 4. Of the pressure vessels, with same thickness but different diameters, which one withstands higher pressure?
Options- A. Larger dia vessel.
- B. Smaller dia vessel.
- C. Larger dia long vessel.
- D. Strength of the vessel is same irrespective of the diameter. Discuss
Correct Answer: Smaller dia vessel.
- 5. The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.
Options- A. 0.1-0.2
- B. 0.2-0.5
- C. 0.4-0.9
- D. 1.2-1.5 Discuss
Correct Answer: 0.4-0.9
- 6. In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of
Options- A. 1000
- B. 3000
- C. 5000
- D. 10000 Discuss
Correct Answer: 10000
- 7. Skirt support is the most suitable for supporting __________ vessels.
Options- A. small horizontal
- B. large horizontal
- C. tall vertical
- D. thick walled Discuss
Correct Answer: tall vertical
- 8. Baffles may be eliminated for
Options- A. low viscosity liquids (< 200 poise).
- B. high viscosity liquids (> 600 poise).
- C. large diameter tanks.
- D. none of these. Discuss
Correct Answer: high viscosity liquids (> 600 poise).
- 9. In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference
Options- A. is always less than arithmetic average value.
- B. is always more than arithmetic mean value and the geometric mean value.
- C. is always less than arithmetic mean value, but more than geometric mean value.
- D. may be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current. Discuss
Correct Answer: is always less than arithmetic average value.
- 10. Column support for the roof of cylindrical storage tank must be provided for
Options- A. small diameter tanks.
- B. large diameter tanks.
- C. small diameter tall tanks.
- D. all tanks irrespective of their heights and diameters. Discuss
Correct Answer: large diameter tanks.
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