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- Question
Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3 . The diffusivity of aniline in air is 0.74xl0-5m2/s.The numerical value of mass transfer co-efficient is 7.4 x 10-3. The rate of evaporation of aniline is 2.97 x 10-4. Its units are
Options- A. mole/s
- B. mole/cm2. s
- C. mole/m2 . s
- D. kmole/m2 . s
- Correct Answer
- kmole/m2 . s
- 1. Alkylation
Options- A. causes olefins to combine with each other.
- B. causes olefins to combine with iso-paraffins.
- C. converts iso-paraffin into olefin.
- D. converts olefin into paraffin. Discuss
- 2. An adequate clearance between the tray and the shell wall of a distillation column is provided to
Options- A. drain the liquid from the tray when the unit is not in operation.
- B. allow for thermal expansion and facilitate installation.
- C. avoid back-trapping.
- D. none of these. Discuss
- 3. Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a
Options- A. higher dew point.
- B. higher absolute (specific) humidity.
- C. higher relative humidity
- D. higher wet bulb temperature. Discuss
- 4. __________ baffles are provided in ball mills.
Options- A. Horizontal
- B. No
- C. Only two
- D. None of these Discuss
- 5. The minimum shell thickness for tank ? 15 metres diameter is limited to __________ mm, for reasons of elastic stability.
Options- A. 2
- B. 5
- C. 10
- D. 15 Discuss
- 6. Cartridge filters are termed as 'edge' filters, because of the fact that the
Options- A. disks have very sharp edge.
- B. solids are not deposited at the edge of the disk.
- C. bulk of the solids are removed at the periphery of the disks.
- D. none of these. Discuss
- 7. The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is
Options- A. pd/2t
- B. pd/4t
- C. pd/t
- D. pd/8t Discuss
- 8. Which is a secondary crusher for a hard & tough stone?
Options- A. Jaw crusher
- B. Cone crusher
- C. Impact crusher
- D. Toothed roll crusher Discuss
- 9. H/C ratio (by weight) for the same number of carbon atoms is the highest in case of
Options- A. aromatics
- B. paraffins
- C. olefins
- D. naphthenes Discuss
- 10. Liquid discharge from a tank or reservoir can not be measured by
Options- A. orificemeters
- B. weirs
- C. mouthpieces
- D. notches Discuss
More questions
Correct Answer: causes olefins to combine with iso-paraffins.
Correct Answer: allow for thermal expansion and facilitate installation.
Correct Answer: higher relative humidity
Correct Answer: Horizontal
Correct Answer: 5
Correct Answer: bulk of the solids are removed at the periphery of the disks.
Correct Answer: pd/4t
Correct Answer: Cone crusher
Correct Answer: naphthenes
Correct Answer: orificemeters
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