Discussion
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- Question
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
- Correct Answer
- ? = 17 - 61.1 log ?
- 1. 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
- 2. 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
- 3. Coke oven gas consists mainly of
Options- A. H2, & CH4
- B. CO, & CO2
- C. H2, & CO
- D. CH4, & CO Discuss
- 4. Carbon Content by weight in air dried wood may be about __________ percent.
Options- A. 10
- B. 25
- C. 50
- D. 80 Discuss
- 5. Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
Options- A. 0.5
- B. 10
- C. 50
- D. 500 Discuss
- 6. 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 Discuss
- 7. Fresh water carrying pipelines in chemical industries are coloured with __________ color.
Options- A. sea green
- B. brown
- C. yellow
- D. red Discuss
- 8. 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
- 9. 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
- 10. 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
Process Equipment and Plant Design problems
Search Results
Correct Answer: ratio of fixed carbon to volatile matter increases.
Correct Answer: lengthens the flame.
Correct Answer: H2, & CH4
Correct Answer: 50
Correct Answer: 10
Correct Answer: 75
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.
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