MCQOPTIONS
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MCQOPTIONS
This section includes 15 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. |
Identify the correct relation between Biot number and Fourier number |
| A. | 4 b T = B I F 0 |
| B. | 2 b T = B I F 0 |
| C. | 3 b T = B I F 0 |
| D. | b T = B I F 0 |
| Answer» E. | |
| 2. |
Fourier number is given by |
| A. | α T/LC2 |
| B. | 2 α T/LC2 |
| C. | 3 α T/LC2 |
| D. | 4 α T/LC2 |
| Answer» B. 2 α T/LC2 | |
| 3. |
For a plat plate (thickness δ, breadth b and height h) the heat exchange occurs from both the sides. The characteristics length is equal to |
| A. | δ/4 |
| B. | δ/3 |
| C. | δ/2 |
| D. | δ |
| Answer» D. δ | |
| 4. |
The quantity h L C/k is known as |
| A. | Biot number |
| B. | Fourier number |
| C. | Stanton number |
| D. | Nusselt number |
| Answer» B. Fourier number | |
| 5. |
During heat treatment, cylindrical pieces of 25 mm diameter, 30 mm height and at 30 degree Celsius are placed in a furnace at 750 degree Celsius with convective coefficient 80 W/m2 degree. Calculate the time required to heat the pieces to 600 degree Celsius. Assume the following property valuesDensity = 7850 kg /m3Specific heat = 480 J/kg KConductivity = 40 W/m degree |
| A. | 226 sec |
| B. | 326 sec |
| C. | 426 sec |
| D. | 526 sec |
| Answer» C. 426 sec | |
| 6. |
A gold ring (k = 65 W/m K) measuring 15 * 10 * 60 cm is exposed to a surface where h = 11.5 W/m2 K. Find the value of biot number |
| A. | 0.68 |
| B. | 0.58 |
| C. | 0.48 |
| D. | 0.38 |
| Answer» D. 0.38 | |
| 7. |
FOURIER_NUMBER_IS_GIVEN_BY?$ |
| A. | α T/L<sub>C</sub><sup>2</sup> |
| B. | 2 α T/L<sub>C</sub><sup>2</sup> |
| C. | 3 α T/L<sub>C</sub><sup>2</sup> |
| D. | 4 α T/L<sub>C</sub><sup>2</sup> |
| Answer» B. 2 ‚âà√≠¬¨¬± T/L<sub>C</sub><sup>2</sup> | |
| 8. |
Identify_the_correct_relation_between_Biot_number_and_Fourier_number$ |
| A. | 4 b T = B<sub> I </sub>F <sub>0</sub> |
| B. | 2 b T = B<sub> I </sub>F <sub>0</sub> |
| C. | 3 b T = B<sub> I </sub>F <sub>0</sub> |
| D. | b T = B<sub> I </sub>F <sub>0</sub> |
| Answer» E. | |
| 9. |
For a plat plate (thickness δ, breadth b and height h) the heat exchange occurs from both the sides. The characteristics length is equal t?# |
| A. | δ/4 |
| B. | δ/3 |
| C. | δ/2 |
| D. | δ |
| Answer» D. ‚âà√≠¬¨‚Ä¢ | |
| 10. |
The quantity h L C/k is known as |
| A. | Biot number |
| B. | Fourier number |
| C. | Stanton number |
| D. | Nusselt number |
| Answer» B. Fourier number | |
| 11. |
In the non-dimensional Biot number, the characteristics length is the ratio of |
| A. | Perimeter to surface area of solid |
| B. | Surface area to perimeter of solid |
| C. | Surface area to volume of solid |
| D. | Volume of solid to its surface area |
| Answer» E. | |
| 12. |
Lumped parameter analysis for transient heat conduction is essentially valid for |
| A. | B <sub>I</sub> < 0.1 |
| B. | 1 < B <sub>I</sub> < 10 |
| C. | 0.1 < B <sub>I</sub> < 0.5 |
| D. | It tends to infinity |
| Answer» B. 1 < B <sub>I</sub> < 10 | |
| 13. |
Which of the following dimensionless number gives an indication of the ratio of internal (conduction) resistance to the surface (convective) resistance? |
| A. | Biot number |
| B. | Fourier number |
| C. | Stanton number |
| D. | Nusselt number |
| Answer» B. Fourier number | |
| 14. |
In the lumped system parameter model, the variation of temperature with time is |
| A. | Linear |
| B. | Exponential |
| C. | Sinusoidal |
| D. | Cube |
| Answer» C. Sinusoidal | |
| 15. |
A gold ring (k = 65 W/m K) measuring 15 * 10 * 60 cm is exposed to a surface where h = 11.5 W/m2 K. Find the value of biot number |
| A. | 0.68 |
| B. | 0.58 |
| C. | 0.48 |
| D. | 0.38 |
| Answer» D. 0.38 | |