MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
What is the direction of flow in the centre tubes and wall-side tubes of a long tube falling film evaporator? |
| A. | Both downwards |
| B. | Both upwards |
| C. | Downward and upward respectively |
| D. | Upward and downward respectively |
| Answer» B. Both upwards | |
| 2. |
The following are few demerits of using short tube vertical evaporators, select the incorrect one. |
| A. | Long tubes efficiently evaporate and hence recirculation is hardly required |
| B. | Corrosive fluids cannot be used as it increases cleaning cost |
| C. | Large head room requirement |
| D. | Very low heat transfer coefficients with thick fluids |
| Answer» B. Corrosive fluids cannot be used as it increases cleaning cost | |
| 3. |
Which one of the following is not an advantage of Long tube evaporators? |
| A. | Good heat transfer coefficients at low temperature gradients |
| B. | Low head space required |
| C. | Thin fluids have very large product economy |
| D. | Relatively inexpensive to manufacture |
| Answer» C. Thin fluids have very large product economy | |
| 4. |
Which one of the following is not a property of long tube evaporators? |
| A. | It uses recirculation frequently |
| B. | It has a down-comer |
| C. | Has very long tubes |
| D. | Uses natural convection |
| Answer» C. Has very long tubes | |
| 5. |
While using Long tube evaporators, the desired concentration is usually not achieved in single flow. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
Long tube evaporators find their use in which one of the following most commonly? |
| A. | Feedstock concentration |
| B. | Food industries |
| C. | Pharmaceuticals |
| D. | Acid concentration |
| Answer» C. Pharmaceuticals | |
| 7. |
The heating medium in the Long tube evaporator is usually _______ |
| A. | Gas at temperature just above 130℃ |
| B. | Steam |
| C. | Gas at temperature just below 100℃ |
| D. | Gas at very high temperatures |
| Answer» C. Gas at temperature just below 100℃ | |
| 8. |
What is the average tube length of long tube evaporators? |
| A. | 4-10ft |
| B. | 4-10m |
| C. | 1-2ft |
| D. | More than 10m |
| Answer» C. 1-2ft | |
| 9. |
Long tube evaporators are usually ______ evaporators. |
| A. | Natural convection |
| B. | Forced convection |
| C. | Nucleate boiling |
| D. | Radiation heated |
| Answer» B. Forced convection | |
| 10. |
Long tube evaporators can be classified as rising or climbing film. |
| A. | True |
| B. | False |
| Answer» B. False | |