Discussion
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- Question
Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than __________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop.
Options- A. 25
- B. 50
- C. 75
- D. 150
- Correct Answer
- 75
- 1. Overall distillation column efficiency for most of the refinery columns can be given by (for ? = 0.07 - 1.4 cp and relative volatility < 4) (where ? = overall column efficiency, % ? = molal average viscosity of feed at average column temperature and pressure, cp ?p = pressure drop per tray, psi)
Options- A. ? = 17 - 61.1 log ?
- B.
- C. ? = 1.66 - 0.25 log ?
- D. ? = 0.25 log ? - 1.67 Discuss
- 2. Ratio of primary air to secondary air increases with increase in the rank of coal, because the
Options- A. high rank coals have higher amount of volatile matter.
- B. ratio of fixed carbon to volatile matter increases.
- C. oxygen content progressively decreases.
- D. calorific value of the coal increases. Discuss
- 3. During combustion of gaseous fuels, deficiency of air
Options- A. lengthens the flame.
- B. tends to shorten the flame.
- C. does not affect the flame length.
- D. increases the flame temperature. Discuss
- 4. Coke oven gas consists mainly of
Options- A. H2, & CH4
- B. CO, & CO2
- C. H2, & CO
- D. CH4, & CO Discuss
- 5. Carbon Content by weight in air dried wood may be about __________ percent.
Options- A. 10
- B. 25
- C. 50
- D. 80 Discuss
- 6. Fresh water carrying pipelines in chemical industries are coloured with __________ color.
Options- A. sea green
- B. brown
- C. yellow
- D. red Discuss
- 7. 25 per cent cut segmental baffle means that the baffle
Options- A. height is 75% of the I.D. of the shell.
- B. height is 25% of the I.D. of the shell.
- C. spacing is 75% of its height.
- D. width is 25% of its height. Discuss
- 8. The ratio of shear stress to shear strain is called
Options- A. bulk modulus
- B. shear modulus
- C. modulus of rigidity
- D. modulus of elasticity Discuss
- 9. Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.
Options- A. Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates.
- B. Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap.
- C. Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features.
- D. Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range. Discuss
- 10. Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the
Options- A. ultimate stress to breaking stress.
- B. ultimate stress to working stress.
- C. working stress to ultimate stress.
- D. none of these. Discuss
Process Equipment and Plant Design problems
Search Results
Correct Answer: ? = 17 - 61.1 log ?
Correct Answer: ratio of fixed carbon to volatile matter increases.
Correct Answer: lengthens the flame.
Correct Answer: H2, & CH4
Correct Answer: 50
Correct Answer: sea green
Correct Answer: height is 75% of the I.D. of the shell.
Correct Answer: shear modulus
Correct Answer: Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features.
Correct Answer: ultimate stress to working stress.
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