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. |
Find the shape factor F 12 for the arrangement shown in the figure. The areas A 1 and A 2 are perpendicular but do not share the common edge |
| A. | 0.03 |
| B. | 0.04 |
| C. | 0.05 |
| D. | 0.06 |
| Answer» C. 0.05 | |
| 2. |
The value of shape factor depends on how many factors? |
| A. | 4 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 3. |
An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers areF 11 = 0.1F 12 = 0.4F 13 = 0.25The surface areas A 1 and A 2 are 4 m2 and 2 m2. The view factor F 41 is |
| A. | 0.5 |
| B. | 0.75 |
| C. | 0.1 |
| D. | 0.25 |
| Answer» B. 0.75 | |
| 4. |
A thin shield of emissivity E 3 on both sides is placed between two infinite parallel plates of emissivities E 1 and E 2 and temperatures T 1 and T 2. If E 1 = E 2 = E 3, then the fraction radiant energy transfer without shield takes the value |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.75 |
| D. | 1.25 |
| Answer» C. 0.75 | |
| 5. |
The fraction of the radiative energy that is diffused from one surface element and strikes the other surface directly with no intervening reflections is called(i) Radiation shape factor(ii) Geometrical factor(iii) Configuration factorChoose the correct answer |
| A. | i only |
| B. | ii only |
| C. | i, ii and iii |
| D. | iii only |
| Answer» D. iii only | |
| 6. |
Engineering problems of practical interest are involved with heat exchange between two or more surfaces, and this exchange is strongly dependent upon(i) Radiative properties(ii) Temperature levels(iii) Surface geometricsIdentify the correct statements |
| A. | i and ii |
| B. | i and iii |
| C. | ii and iii |
| D. | i, ii and iii |
| Answer» E. | |
| 7. |
THE_VALUE_OF_SHAPE_FACTOR_DEPENDS_ON_HOW_MANY_FACTORS??$ |
| A. | 4 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 8. |
Two long parallel surfaces, each of emissivity 0.7 are at different temperatures and accordingly have radiation exchange between them. It is desired to reduce 75% of this radiant heat transfer by inserting thin parallel shields of equal emissivity 0.7 on both sides. What should be the number of shields? |
| A. | 2 |
| B. | 4 |
| C. | 1 |
| D. | 3 |
| Answer» E. | |
| 9. |
The grey body shape factor for radiant heat exchange between a small body (emissivity = 0.4) in a large enclosure (emissivity = 0.5) is |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.4 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 10. |
A thin shield of emissivity E 3 on both sides is placed between two infinite parallel plates of emissivities E 1 and E 2 and temperatures T 1 and T 2. If E 1 = E 2 = E 3, then the fraction radiant energy transfer without shield takes the value |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.75 |
| D. | 1.25 |
| Answer» C. 0.75 | |
| 11. |
For the same type of shapes, the value of the radiation shape factor will be higher when |
| A. | Surfaces are closer |
| B. | Surfaces are larger and held closer |
| C. | Surfaces are moved further apart |
| D. | Surfaces are smaller and held closer |
| Answer» C. Surfaces are moved further apart | |
| 12. |
The interchange factor is also known as |
| A. | Equivalent emissivity |
| B. | Irradiation |
| C. | Radiosity |
| D. | Shape factor |
| Answer» B. Irradiation | |
| 13. |
The fraction of the radiative energy that is diffused from one surface element and strikes the other surface directly with no intervening reflections is called |
| A. | Radiation shape factor |
| B. | Geometrical factor |
| C. | Configuration factor |
| Answer» D. | |