MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer Operations knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Why is forced convection evaporation also known as flash evaporation? |
| A. | Because heat is supplied in a flash |
| B. | Boiling the fluid in high pressure operation then exposing to low pressure |
| C. | Total evaporation takes place in a flash |
| D. | Very large temperature created |
| Answer» C. Total evaporation takes place in a flash | |
| 2. |
Forced circulation evaporators are highly suited for ________ |
| A. | High corrosive fluids |
| B. | Fouling fluids that usually scale |
| C. | Thin fluids |
| D. | Highly volatile fluids |
| Answer» C. Thin fluids | |
| 3. |
Which one of the following is not a demerit of forced circulation evaporator? |
| A. | High operation cost |
| B. | Power consumption for pumps |
| C. | High residence time |
| D. | High temperatures of operation |
| Answer» E. | |
| 4. |
Which one of the following is not an advantage of forced convection boiling? |
| A. | High heat transfer coefficient |
| B. | Positive circulation |
| C. | Very cheap to operate |
| D. | Low fouling or scaling |
| Answer» D. Low fouling or scaling | |
| 5. |
Forced convection boiling is also known as __________ |
| A. | Flash boiling |
| B. | Nucleate boiling |
| C. | Partial nucleate boiling |
| D. | Bubble boiling |
| Answer» B. Nucleate boiling | |
| 6. |
Forced circulation is sometimes more suitable because of which one of the following statements? |
| 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. | Cheaper than others |
| Answer» D. Cheaper than others | |
| 7. |
The Residence tie in forced convection evaporators is ________ than natural convection evaporator. |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Very less |
| Answer» B. Less | |
| 8. |
Which one of the following evaporator does not use forced boiling as its boiling operation? |
| A. | Plate type evaporators |
| B. | Horizontal tube evaporators |
| C. | Vertical tube evaporators |
| D. | Falling tube evaporators |
| Answer» E. | |
| 9. |
The boiling that takes place in forced convection boiling is popularly known as surface boiling. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
The presence of forced convection makes the complete mixed fluid boiling pattern known as __________ |
| A. | Pool boiling |
| B. | Surface boiling |
| C. | Bubble boiling |
| D. | Film boiling |
| Answer» B. Surface boiling | |
| 11. |
With forced convection boiling, nucleate boiling is absent which makes wall temperature very close to interface temperature. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
What do we mean by forced convection evaporator? |
| A. | This is nucleate boiling |
| B. | This has a fan to remove vapour from the surface |
| C. | There is an agitator to mix the heated fluid |
| D. | There is an agitator to mix the heating medium such as steam |
| Answer» D. There is an agitator to mix the heating medium such as steam | |