| 21. |
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)
 |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
| View Answer Report Discuss 50-50! |
|
Answer: (a).A
|
| 22. | Relative humidity is the ratio of the |
| a. | partial pressure of the vapour to the vapour pressure of the liquid at room temperature. |
| b. | partial pressure of the vapour to the vapour pressure of the liquid at gas temperature. |
| c. | actual humidity to saturation humidity. |
| d. | none of these |
| View Answer Report Discuss 50-50! |
|
Answer: (b).partial pressure of the vapour to the vapour pressure of the liquid at gas temperature.
|
| 23. | In batch distillation with constant reflux, overhead product composition __________ with time. |
| a. | increases |
| b. | decreases |
| c. | does not vary |
| d. | may increase on decrease, depends on the system. |
| View Answer Report Discuss 50-50! |
|
Answer: (b).decreases
|
| 24. | Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre. |
| a. | electrical resistance |
| b. | thermal conductivity |
| c. | strength |
| d. | none of these. |
| View Answer Report Discuss 50-50! |
|
Answer: (a).electrical resistance
|
| 25. | Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the |
| a. | latent heat |
| b. | humid heat |
| c. | specific heat |
| d. | sensible heat |
| View Answer Report Discuss 50-50! |
|
Answer: (c).specific heat
|