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. |
For n-tubes in a vertical column of the tube bank pattern, identify the correct statement |
| A. | D <sub>e</sub> = n<sub> </sub>D |
| B. | D <sub>e</sub> = n<sup> 2</sup><sub> </sub>D |
| C. | D <sub>e</sub> = (1/n)<sub> </sub>D |
| D. | D <sub>e</sub> =<sub> </sub>D |
| Answer» B. D <sub>e</sub> = n<sup> 2</sup><sub> </sub>D | |
| 2. |
The relation between relative effectiveness of horizontal and vertical tubes as condensing surfaces is given by |
| A. | h <sub>h</sub>/h <sub>v </sub>= 0.768 (l/d) |
| B. | h <sub>h</sub>/h <sub>v </sub>= 0.768 (l/d) <sup>0.25</sup> |
| C. | h <sub>h</sub>/h <sub>v </sub>= 0.768 (l/d) <sup>0.5</sup> |
| D. | h <sub>h</sub>/h <sub>v </sub>= 0.768 (l/d) <sup>1.25</sup> |
| Answer» C. h <sub>h</sub>/h <sub>v </sub>= 0.768 (l/d) <sup>0.5</sup> | |
| 3. |
Kirk bride criterion is given by |
| A. | h = 0.0057 (Re)<sup> 0.4</sup> [k <sup>3 </sup>p<sup> 2</sup> g/ <sup> 2</sup>]<sup> 1/3</sup> |
| B. | h = 0.0067 (Re)<sup> 0.4</sup> [k <sup>3 </sup>p<sup> 2</sup> g/ <sup> 2</sup>]<sup> 1/3</sup> |
| C. | h = 0.0077 (Re)<sup> 0.4</sup> [k <sup>3 </sup>p<sup> 2</sup> g/ <sup> 2</sup>]<sup> 1/3</sup> |
| D. | h = 0.0087 (Re)<sup> 0.4</sup> [k <sup>3 </sup>p<sup> 2</sup> g/ <sup> 2</sup>]<sup> 1/3</sup> |
| Answer» D. h = 0.0087 (Re)<sup> 0.4</sup> [k <sup>3 </sup>p<sup> 2</sup> g/ <sup> 2</sup>]<sup> 1/3</sup> | |
| 4. |
What is the value of Reynolds number in terms of mass flow rate? |
| A. | 4 m/ b |
| B. | 2 m/ b |
| C. | 3 m/ b |
| D. | m / b |
| Answer» B. 2 m/ b | |
| 5. |
What is the value of characteristics length in turbulent film condensation? |
| A. | |
| B. | 3 |
| C. | 2 |
| D. | 4 |
| Answer» E. | |
| 6. |
Consider the above problem, find the rate at which steam is condensed at the tube surface |
| A. | 7.7 * 10 <sup>-3</sup> |
| B. | 8.7 * 10 <sup>-3</sup> |
| C. | 9.7 * 10 <sup>-3</sup> |
| D. | 10.7 * 10 <sup>-3</sup> |
| Answer» C. 9.7 * 10 <sup>-3</sup> | |
| 7. |
The outer surface of a vertical tube is 1.25 m long and outer diameter is 50 mm is exposed to saturated steam at atmospheric pressure. If the tube surface is maintained at 80 degree Celsius by the flow of cooling water through it, determine the rate of heat transfer to the coolant |
| A. | 47648 W |
| B. | 12345 W |
| C. | 19879 W |
| D. | 97123 W |
| Answer» D. 97123 W | |
| 8. |
A condenser is to be designed to condense 225.0 kg of steam per hour at a pressure of 0.15 bar. A square array of 400 tubes, each of 6 mm in diameter, is available for the task. If the tube surface temperature is to be maintained at 26 degree Celsius, make calculations for the length of the tube |
| A. | 4.353 m |
| B. | 3.353 m |
| C. | 2.353 m |
| D. | 1.353 m |
| Answer» E. | |
| 9. |
The transition from laminar to turbulent flow occurs at a critical Reynolds number of |
| A. | 1800 |
| B. | 2200 |
| C. | 2600 |
| D. | 3000 |
| Answer» B. 2200 | |
| 10. |
Which parameter is responsible for the commencement of the turbulent flow? |
| A. | Fourier number |
| B. | Reynolds number |
| C. | Stanton number |
| D. | Nusselt number |
| Answer» C. Stanton number | |