| 31. | Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as |
| a. | K ∝ D |
| b. | K ∝ √D |
| c. | K ∝ D^1.5 |
| d. | K ∝ D² |
| View Answer Report Discuss 50-50! |
|
Answer: (a).K ∝ D
|
| 32. | Drying operation under vacuum is carried out to |
| a. | dry those materials which have very high unbound mositure content. |
| b. | reduce drying temperature. |
| c. | increase drying temperature. |
| d. | dry materials having high bound moisture content. |
| View Answer Report Discuss 50-50! |
|
Answer: (b).reduce drying temperature.
|
| 33. | 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 |
| a. | higher dew point. |
| b. | higher absolute (specific) humidity. |
| c. | higher relative humidity |
| d. | higher wet bulb temperature. |
| View Answer Report Discuss 50-50! |
|
Answer: (c).higher relative humidity
|
| 34. | Separation of two or more components of a liquid solution can not be achieved by |
| a. | fractional crystallisation |
| b. | liquid extraction |
| c. | absorption |
| d. | evaporation |
| View Answer Report Discuss 50-50! |
|
Answer: (c).absorption
|
| 35. | Stefan's law describes the mass transfer by |
| a. | diffusion |
| b. | bulk flow |
| c. | both 'a' & 'b' |
| d. | neither 'a' nor 'b' |
| View Answer Report Discuss 50-50! |
|
Answer: (c).both 'a' & 'b'
|