MCQOPTIONS
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MCQOPTIONS
This section includes 13 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 of the following statements are not true about fouling in a Heat Exchanger? |
| A. | It decreases the heat transfer coefficient in both sides |
| B. | Temperature of the hot fluid remains hot and the cold fluid remains cold |
| C. | Pressure drop decreases |
| D. | Efficiency decreases |
| Answer» D. Efficiency decreases | |
| 2. |
Which one of the following fouling deposits on a heat exchanger cannot be removed by using wire brushes or high speed water jets? |
| A. | Chemical |
| B. | Deposition |
| C. | Biology |
| D. | Corrosion |
| Answer» E. | |
| 3. |
Nickel alloy based Heat exchangers are used to avoid _____ fouling. |
| A. | Chemical |
| B. | Deposition |
| C. | Biology |
| D. | Corrosion |
| Answer» E. | |
| 4. |
Which one of the following fouling phenomenon is under the control of the operator? |
| A. | Chemical |
| B. | Deposition |
| C. | Biology |
| D. | Corrosion |
| Answer» C. Biology | |
| 5. |
Algal deposits on the tube surfaces of the heat exchanger belong to which class of fouling? |
| A. | Chemical |
| B. | Deposition |
| C. | Biology |
| D. | Corrosion |
| Answer» D. Corrosion | |
| 6. |
The phenomenon of scaling on the surface of a Heat Exchanger due to the hardness of water where salts get deposited on the surface is an example of ____ fouling. |
| A. | Chemical |
| B. | Deposition |
| C. | Biology |
| D. | Corrosion |
| Answer» B. Deposition | |
| 7. |
Deposition fouling can be avoided or controlled by monitoring the flow velocity of the fluid so that sediments don’t settle out. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
For the calculation of Dirty Overall Heat transfer coefficient UD, for given fouling factor Rf and Dirt Factor Rd, which one of the following expressions do we use? |
| A. | \(\frac{1}{U_D} = \frac{1}{U_C} + R_D\) |
| B. | \(\frac{1}{U_D} = \frac{1}{U_C} + \frac{1}{R_D}\) |
| C. | UD = UC + RD |
| D. | UD = \(U_C+\frac{1}{R_D}\) |
| Answer» C. UD = UC + RD | |
| 9. |
Which one of the following is not a collective class of fouling? |
| A. | Biological fouling |
| B. | Deposition Fouling |
| C. | Chemical Fouling |
| D. | Iron fouling |
| Answer» E. | |
| 10. |
How many types of readily identifiable Fouling exist? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 11. |
Which of the following methods can determine the fouling factor of a Heat Exchangers? |
| A. | A dirty Heat Exchanger |
| B. | A clean Heat Exchanger |
| C. | A dirty and a clean Heat Exchanger |
| D. | A dirty and a fully choked Heat Exchanger |
| Answer» D. A dirty and a fully choked Heat Exchanger | |
| 12. |
Which one of the following cannot be determined by knowing fouling factors? |
| A. | When to clean the equipment |
| B. | When the equipment will stop to work |
| C. | Its value is zero for a new heat exchanger |
| D. | Its value is infinity for an old heat exchanger |
| Answer» E. | |
| 13. |
Fouling factors increase the overall heat transfer conductance and hence decrease the overall heat transfer coefficient. |
| A. | True |
| B. | False |
| Answer» C. | |