MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 12 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. |
Radiation emitted by a black surface is a function of wavelength and temperature but is independent of direction. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
For a prescribed wavelength a black body radiates how much energy at the temperature of body? |
| A. | Maximum |
| B. | Minimum |
| C. | 20% |
| D. | 50% |
| Answer» B. Minimum | |
| 3. |
The electromagnetic waves are emitted as a result of(i) Vibrational movement(ii) Rotational movement(iii)Atomic or sub-atomic particles comprising the matterIdentify the correct statement |
| A. | i and ii |
| B. | ii and iii |
| C. | i and iii |
| D. | i, ii and iii |
| Answer» E. | |
| 4. |
FOR_A_PRESCRIBED_WAVELENGTH_A_BLACK_BODY_RADIATES_HOW_MUCH_ENERGY_AT_THE_TEMPERATURE_OF_BODY??$ |
| A. | Maximum |
| B. | Minimum |
| C. | 20% |
| D. | 50% |
| Answer» B. Minimum | |
| 5. |
Radiation_emitted_by_a_black_surface_is_a_function_of_wavelength_and_temperature_but_is_independent_of_direction.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
What is the wavelength band for cosmic rays? |
| A. | Up to 45 * 10<sup> -7 </sup>micron meter |
| B. | Up to 23 * 10<sup> -7 </sup>micron meter |
| C. | Up to 19 * 10<sup> -7 </sup>micron meter |
| D. | Up to 4 * 10<sup> -7 </sup>micron meter |
| Answer» E. | |
| 7. |
A perfectly black body |
| A. | Absorbs all the incident radiation |
| B. | Allow all the incident radiation to pass through it |
| C. | Reflects all the incident radiation |
| D. | Has its surface coated with lamp black or graphite |
| Answer» B. Allow all the incident radiation to pass through it | |
| 8. |
Thermal radiations occur in the portion of electromagnetic spectrum between the wavelengths |
| A. | 10<sup> -2</sup> to 10<sup> -4</sup> micron |
| B. | 10<sup> -1</sup> to 10<sup> -2</sup> micron |
| C. | 0.1 to 10<sup> 2</sup> micron |
| D. | 10<sup> -2</sup> micron onwards |
| Answer» D. 10<sup> -2</sup> micron onwards | |
| 9. |
Energy released by a radiating surface is not continuous but is in the form of successive and separate packets of energy called |
| A. | Photons |
| B. | Protons |
| C. | Electrons |
| D. | Neutrons |
| Answer» B. Protons | |
| 10. |
Radiation exchange occurs in |
| A. | Solid |
| B. | Vacuum |
| C. | Liquid |
| D. | Gas |
| Answer» C. Liquid | |
| 11. |
Which is true regarding radiation? |
| A. | Radiation travels only in medium |
| B. | Radiation travels without any medium |
| C. | Radiation travels in medium but sometimes without medium |
| D. | Radiation travels in medium or without medium |
| Answer» E. | |
| 12. |
Radiation heat transfer is characterized by |
| A. | Due to bulk fluid motion, there is a transport of energy |
| B. | Thermal energy transfer as vibrational energy in the lattice structure of the material |
| C. | Movement of discrete packets of energy as electromagnetic waves |
| D. | There is circulation of fluid by buoyancy effects |
| Answer» D. There is circulation of fluid by buoyancy effects | |