MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 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. |
Which one of the following is not a disadvantage of agitated film evaporator? |
| A. | Cost of motors for agitators |
| B. | Higher cost compared to standard evaporation equipment |
| C. | Absence of static pressure on the boiling liquid |
| D. | Staging or vapour recompression for energy recovery are not possible |
| Answer» D. Staging or vapour recompression for energy recovery are not possible | |
| 2. |
Which one of the following is not an advantage of agitated film evaporator? |
| A. | Elevated heat transfer coefficients due to agitation. |
| B. | Very low operation cost |
| C. | Ability of working at high vacuum (down to 0.001 mbar) |
| D. | Very low residence times (to avoid product degradation) |
| Answer» C. Ability of working at high vacuum (down to 0.001 mbar) | |
| 3. |
Where does the agitation take place in an agitated film evaporator? |
| A. | Before the liquid falls |
| B. | At the film on the tube surface |
| C. | At the upper end as fluid enters rest is turbulent |
| D. | At the bottom-most point |
| Answer» C. At the upper end as fluid enters rest is turbulent | |
| 4. |
Agitated film evaporator is also known as _______ film evaporator. |
| A. | Wiped |
| B. | Swiped |
| C. | Flushed |
| D. | Flash |
| Answer» B. Swiped | |
| 5. |
Agitated film evaporator is sometimes more suitable because of which one of the following statement? |
| A. | It has Low pressure operations |
| B. | The temperature can be maintained as circulation is present |
| C. | The flow velocity in the tubes and the liquid temperature can be controlled to suit the product requirements |
| D. | Self cleaning because of presence of blades |
| Answer» E. | |
| 6. |
The residence time of agitated film evaporators is ______ than rising film evaporators. |
| A. | More |
| B. | Less |
| C. | Very much higher |
| D. | Negligible |
| Answer» C. Very much higher | |
| 7. |
Which one of the following is not a property of agitated film evaporator? |
| A. | Prevents the formation of hot spots due to agitation |
| B. | Absence of static pressure on the boiling liquid |
| C. | Staging or vapour recompression for energy recovery |
| D. | Ability to work in continuous or batch mode |
| Answer» D. Ability to work in continuous or batch mode | |
| 8. |
The blades of the agitated film evaporator have a self cleaning effect on the evaporator and hence give us the freedom to use fouling fluids. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Which one of the following is a merit of agitated film evaporator? |
| A. | Nucleate boiling |
| B. | Falling film |
| C. | Self cleaning equipment |
| D. | High temperature management |
| Answer» D. High temperature management | |
| 10. |
How do the Agitated film evaporator increase heat transfer coefficient? |
| A. | It has a set of blades that keeps renewing the film |
| B. | It has mixers that mix the fluid |
| C. | It is a type of climbing film evaporator with agitators |
| D. | It is a horizontal tube evaporator with agitated outer fluid |
| Answer» B. It has mixers that mix the fluid | |
| 11. |
Agitated film evaporators are best suited for_________ |
| A. | High corrosive fluids |
| B. | Fouling fluids that usually scale |
| C. | Highly viscous fluids |
| D. | Highly volatile fluids |
| Answer» D. Highly volatile fluids | |