MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Mass Transfer knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The dimension of diffusion coefficient is given by |
| A. | M L T -2 |
| B. | L 2 T -1 |
| C. | L T -1 |
| D. | M L -2 T |
| Answer» C. L T -1 | |
| 2. |
What is the molecular weight of Sulphur-dioxide? |
| A. | 84 |
| B. | 74 |
| C. | 64 |
| D. | 54 |
| Answer» D. 54 | |
| 3. |
Estimate the diffusion coefficient of carbon monoxide through air in which the mole fractions of each constituents areO 2 = 0.18N 2 = 0.72CO = 0.10The gas mixture is at 300 K and 2 atmosphere total pressure. The diffusivity values areD CO = 18.5 * 10 -6 m2/s at 273 K, 1 atmD CN = 19.2 * 10 -6 m2/s at 288 K, 1 atmThe subscripts C is carbon monoxide, O is oxygen and N is nitrogen |
| A. | 10.29 * 10 -6 m2/s |
| B. | 18.5 * 10 -6 m2/s |
| C. | 17.5 * 10 -6 m2/s |
| D. | 13.5 * 10 -6 m2/s |
| Answer» B. 18.5 * 10 -6 m2/s | |
| 4. |
Estimate the diffusion coefficient for ammonia in air t 25 degree Celsius temperature and one atmospheric pressure.For ammonia,Molecular weight = 17Molecular volume = 25.81 cm3/gm moleFor air,Molecular weight = 29 |
| A. | 0.4880 cm2/s |
| B. | 0.3880 cm2/s |
| C. | 0.2880 cm2/s |
| D. | 0.1880 cm2/s |
| Answer» E. | |
| 5. |
What is the unit of diffusion coefficient? |
| A. | m2 |
| B. | s |
| C. | m2 s |
| D. | m2/s |
| Answer» E. | |
| 6. |
Figure shows equimolal diffusion between species B and C. Identify the correct molar diffusion rate |
| A. | N b = m c/M b |
| B. | N b = m b/M b |
| C. | N c = m b/M b |
| D. | N c = m b/M c |
| Answer» C. N c = m b/M b | |
| 7. |
Fick’s law is given by the formula |
| A. | N b = – D b c d C b/d x |
| B. | N b = – 2 D b c d C b/d x |
| C. | N b = – 3 D b c d C b/d x |
| D. | N b = – 4 D b c d C b/d x |
| Answer» B. N b = – 2 D b c d C b/d x | |
| 8. |
WHAT_IS_THE_MOLECULAR_WEIGHT_OF_SULPHUR-DIOXIDE??$ |
| A. | 84 |
| B. | 74 |
| C. | 64 |
| D. | 54 |
| Answer» D. 54 | |
| 9. |
The_dimension_of_diffusion_coefficient_is_given_by$ |
| A. | M L T <sup>-2</sup> |
| B. | L <sup>2 </sup>T <sup>-1</sup> |
| C. | L T <sup>-1</sup> |
| D. | M L <sup>-2 </sup>T |
| Answer» C. L T <sup>-1</sup> | |
| 10. |
What is the value of Schmidt number for hydrogen? |
| A. | 0.23 |
| B. | 0.22 |
| C. | 0.21 |
| D. | 0.21 |
| Answer» C. 0.21 | |
| 11. |
What is the molecular volume of air at normal boiling point? |
| A. | 29.89 cm<sup>3</sup>/gm mole |
| B. | 39.89 cm<sup>3</sup>/gm mole |
| C. | 49.89 cm<sup>3</sup>/gm mole |
| D. | 59.89 cm<sup>3</sup>/gm mole |
| Answer» B. 39.89 cm<sup>3</sup>/gm mole | |
| 12. |
What is the molecular weight of ammonia? |
| A. | 31 |
| B. | 53 |
| C. | 29 |
| D. | 39 |
| Answer» D. 39 | |
| 13. |
Fick’s law is given by the formula |
| A. | N <sub>b </sub>= – D <sub>b c </sub>d C <sub>b</sub>/d x |
| B. | N <sub>b </sub>= – 2 D <sub>b c </sub>d C <sub>b</sub>/d x |
| C. | N <sub>b </sub>= – 3 D <sub>b c </sub>d C <sub>b</sub>/d x |
| D. | N <sub>b </sub>= – 4 D <sub>b c </sub>d C <sub>b</sub>/d x |
| Answer» B. N <sub>b </sub>= ‚Äö√Ñ√∂‚àö√ë‚àö¬® 2 D <sub>b c </sub>d C <sub>b</sub>/d x | |