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. |
When the sun lies at a mean distance from the earth, the heat flux from the sun to the outer edge of the atmosphere has been found to be |
| A. | 2350 W/m2 |
| B. | 3350 W/m2 |
| C. | 4350 W/m2 |
| D. | 1350 W/m2 |
| Answer» E. | |
| 2. |
The solar radiation that is felt at the earth’s surface includes(i) Direct radiation that has passed through the atmosphere(ii) Diffuse radiation from the sky(iii) Absorbed radiation from the waterIdentify the correct statement |
| A. | i only |
| B. | i and ii |
| C. | i, ii and iii |
| D. | ii and iii |
| Answer» C. i, ii and iii | |
| 3. |
The approximate distribution of the flow of sun’s energy to the earth’s surface is |
| A. | 53% is reflected back to space |
| B. | 53% is transmitted to the earth |
| C. | 9% is scattered |
| D. | 22% is absorbed in the atmosphere |
| Answer» D. 22% is absorbed in the atmosphere | |
| 4. |
Amount of heat energy radiated by unit surface of the sun in the same time workout asTake, R = mean distance of earth from the sun and r = radius of sun |
| A. | E = π R2 S/4 π R2 |
| B. | E = 4 π R2 S/4 π R2 |
| C. | E = 4 π R2 |
| D. | E = 4 π R2 S |
| Answer» C. E = 4 π R2 | |
| 5. |
The observed solar constant S0, the true solar constant S and the angular elevation Z of the sun are related by the expression |
| A. | S0 =S a SEC Z |
| B. | S0 =2 S a SEC Z |
| C. | S0 =3 S a SEC Z |
| D. | S0 =4 S a SEC Z |
| Answer» B. S0 =2 S a SEC Z | |
| 6. |
THE_SOLAR_RADIATION_THAT_IS_FELT_AT_THE_EARTH‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬•S_SURFACE_INCLUDES?$# |
| A. | Direct radiation that has passed through the atmosphere |
| B. | Diffuse radiation from the sky |
| C. | Absorbed radiation from the water |
| Answer» C. Absorbed radiation from the water | |
| 7. |
When the sun lies at a mean distance from the earth, the heat flux from the sun to the outer edge of the atmosphere has been found to be$ |
| A. | 2350 W/m<sup>2</sup> |
| B. | 3350 W/m<sup>2</sup> |
| C. | 4350 W/m<sup>2</sup> |
| D. | 1350 W/m<sup>2</sup> |
| Answer» E. | |
| 8. |
The approximate distribution of the flow of sun’s energy to the earth’s surface i?# |
| A. | 53% is reflected back to space |
| B. | 53% is transmitted to the earth |
| C. | 9% is scattered |
| D. | 22% is absorbed in the atmosphere |
| Answer» D. 22% is absorbed in the atmosphere | |
| 9. |
The temperature of the photosphere, referred to as the effective temperature of the sun, is usually taken as |
| A. | 3000 K |
| B. | 4000 K |
| C. | 5000 K |
| D. | 6000 K |
| Answer» E. | |
| 10. |
Temperature of sun can be workout from |
| A. | Wein’s displacement law |
| B. | Stefan-Boltzmann law |
| C. | Kirchhoff’s law |
| D. | All of the Mentioned |
| Answer» B. Stefan-Boltzmann law | |
| 11. |
Amount of heat energy radiated by unit surface of the sun in the same time workout as |
| A. | |
| B. | E = π R<sup>2</sup> S/4 π R<sup>2</sup> |
| C. | E = 4 π R<sup>2</sup> S/4 π R<sup>2</sup> |
| Answer» C. E = 4 ‚âà√¨‚àö√ë R<sup>2</sup> S/4 ‚âà√¨‚àö√ë R<sup>2</sup> | |
| 12. |
The total amount of heat energy received by the sphere of radius r is |
| A. | 2 π R<sup>2</sup> S |
| B. | 6 π R<sup>2</sup> S |
| C. | 4 π R<sup>2</sup> S |
| D. | π R<sup>2</sup> S |
| Answer» D. ‚âà√¨‚àö√ë R<sup>2</sup> S | |
| 13. |
The value of solar constant varies between |
| A. | 1123 and 1237 W/m<sup>2</sup> |
| B. | 1345 and 1453 W/m<sup>2</sup> |
| C. | 1987 and 2346 W/m<sup>2</sup> |
| D. | 1335 and 1815 W/m<sup>2</sup> |
| Answer» E. | |
| 14. |
The observed solar constant S0, the true solar constant S and the angular elevation Z of the sun are related by the expression |
| A. | S<sub>0</sub> =S a <sup>SEC Z</sup> |
| B. | S<sub>0</sub> =2 S a <sup>SEC Z</sup> |
| C. | S<sub>0</sub> =3 S a <sup>SEC Z</sup> |
| D. | S<sub>0</sub> =4 S a <sup>SEC Z</sup> |
| Answer» B. S<sub>0</sub> =2 S a <sup>SEC Z</sup> | |
| 15. |
The heat energy absorbed by a known area in a fixed time is determined with the help of an instrument called |
| A. | Psychrometer |
| B. | Pyrheliometer |
| C. | Thermometric well |
| D. | Any instrument |
| Answer» C. Thermometric well | |