MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If we have a feed flow rate of 30kg/hr at 25℃ then what should be the heating steam rate if we wish to evaporate 4kg of water from the dilute solution in an hour?Latent heat of vaporization of water = 2,260 kJ/kgSpecific heat capacity = 6 KJ/Kg K |
| A. | 10kg |
| B. | 12kg |
| C. | 11kg |
| D. | 13kg |
| Answer» B. 12kg | |
| 2. |
Which one of the following would not benefit the evaporator if employed? |
| A. | Pressure reduced |
| B. | Pressure increased |
| C. | Surface area increased |
| D. | Steam supply increased |
| Answer» C. Surface area increased | |
| 3. |
If evaporation takes place from a feed of 50wt% solid at 25℃ in an hour if there is constant supply of 30kg steam per 100kg feed in that hour, then what is the final concentration?Latent heat of vaporization of water = 2,260 kJ/kgSpecific heat capacity = 6 KJ/Kg K |
| A. | 57 |
| B. | 56 |
| C. | 55 |
| D. | 54 |
| Answer» C. 55 | |
| 4. |
Increasing the pressure of the setup will result in larger evaporation rate. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
If we have a steam flow rate of 10kg/hr then what should be the inlet feed rate if we wish to evaporate 4kg of water from the dilute solution in an hour?Latent heat of vaporization of water = 2,260 kJ/kgSpecific heat capacity = 6 KJ/Kg K |
| A. | 30kg |
| B. | 32kg |
| C. | 31kg |
| D. | 33kg |
| Answer» B. 32kg | |
| 6. |
How much evaporation can take place from a feed of 30kg at 25°C in an hour if there is constant supply of 10kg steam in that hour?Latent heat of vaporization of water = 2,260 kJ/kgSpecific heat capacity = 6 KJ/Kg K |
| A. | 2kg |
| B. | 3kg |
| C. | 4kg |
| D. | 5kg |
| Answer» D. 5kg | |
| 7. |
What is mass of Steam that needs to be supplied in order to heat the tubes and evaporate 10kg of water from a feed of 50kg at a temperature of 25℃ to a final temperature of 100℃?Latent heat of vaporization of water = 2,260 kJ/kgSpecific heat capacity = 6 KJ/Kg K |
| A. | 21kg |
| B. | 22kg |
| C. | 20kg |
| D. | 19kg |
| Answer» D. 19kg | |
| 8. |
What is amount of heat that needs to be supplied in order to evaporate 10kg of water from a feed of 50kg at a temperature of 25℃ to a final temperature of 100℃?Latent heat of vaporization of water = 2,260 kJ/kgSpecific heat capacity = 6 KJ/Kg K |
| A. | 52600 KJ |
| B. | 56200 KJ |
| C. | 2272.6 MJ |
| D. | 45100 KJ |
| Answer» E. | |
| 9. |
Which one of the following is the most common mode of operation of single effect evaporators? |
| A. | Batch |
| B. | Semi-Batch |
| C. | Continuous batch |
| D. | Continuous |
| Answer» D. Continuous | |
| 10. |
Multiple effect evaporators can be constructed with cheap materials than single effect evaporators. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Which one of the following do we prefer to use for single effect over multiple effect evaporator? |
| A. | Low pressure operations |
| B. | High pressure operations |
| C. | Corrosive materials use |
| D. | High temperature operations |
| Answer» D. High temperature operations | |
| 12. |
Why do we use Single effect evaporators when we already have multiple effect one? |
| A. | To have liberty to use fouling liquids |
| B. | To create low pressure |
| C. | To have large temperature |
| D. | To have higher efficiency with cheap material |
| Answer» B. To create low pressure | |