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. |
Consider a system of concentric spheres of radius r 1 and r 2 (r 2 is greater than r 1). If r 1 = 5 cm, determine the radius r 2 if it is desired to have the value of shape factor F 21 equal to 0.6 |
| A. | 6.45 cm |
| B. | 7.45 cm |
| C. | 8.45 cm |
| D. | 9.45 cm |
| Answer» B. 7.45 cm | |
| 2. |
What is the shape factor for a hemispherical bowl with respect to itself of diameter d? The cavity is closed on its outer surface with a flat plate |
| A. | 1.5 |
| B. | 1 |
| C. | 0.5 |
| D. | 2.5 |
| Answer» D. 2.5 | |
| 3. |
Establish a relation for shape factor for a conical cavity with respect to itself of depth h and diameter d. The cavity is closed on its outer surface with a flat plate |
| A. | 1 – d/ (4 h 2 + d) 1/2 |
| B. | 1 – d/ (4 h 2 + d 2) 1/2 |
| C. | 1 – d/ (4 h + d 2) 1/2 |
| D. | 1/2b) 1 – d/ (4 h 2 + d 2) 1/2c) 1 – d/ (4 h + d 2) 1/2d) 1 – d/ (h 2 + d 2) 1/2 |
| Answer» C. 1 – d/ (4 h + d 2) 1/2 | |
| 4. |
What is the shape factor of hemispherical surface closed by a plane surface of diameter d? |
| A. | 0 |
| B. | 1.5 |
| C. | 1 |
| D. | 0.5 |
| Answer» E. | |
| 5. |
What is the shape factor of a sphere of diameter d inside a cubical box of length l = d? |
| A. | π/6 |
| B. | 2 π/6 |
| C. | π/3 |
| D. | π/4 |
| Answer» B. 2 π/6 | |
| 6. |
What is the value of shape factor for two infinite parallel surfaces separated by a distance x? |
| A. | 0 |
| B. | 1 |
| C. | x |
| D. | Infinity |
| Answer» C. x | |
| 7. |
Two radiating surface A 1 = 6 m2 and A 2 = 4 m2 have shape factor F 12 = 0.1. Then the shape factor F 21 will be |
| A. | 0.12 |
| B. | 0.18 |
| C. | 0.15 |
| D. | 0.10 |
| Answer» D. 0.10 | |
| 8. |
The reciprocity theorem states that |
| A. | F 12 = F 21 |
| B. | A 1 F 12 = A 2 F 21 |
| C. | A 1 F 21 = A 2 F 12 |
| D. | A 2 F 21 = A 1 F 12 |
| Answer» C. A 1 F 21 = A 2 F 12 | |
| 9. |
Establish a relation for the shape factor of cylindrical cavity with respect to itself of depth h and diameter d. The cavity is closed on its outer surface with a flat plate |
| A. | 4 h/4 h + d |
| B. | 4 h + d/h |
| C. | 4 h + d/4 h |
| D. | h/4 h + d |
| Answer» B. 4 h + d/h | |
| 10. |
Which of the following is a wrong statement according to the shape factor is equal to one? |
| A. | For any surface completely enclosed by another surface |
| B. | For infinite parallel planes radiating only to each other |
| C. | For a flat or convex surface with respect to itself |
| D. | Inside cylinder to outer cylinder of a long co-axial cylinder |
| Answer» E. | |