MCQOPTIONS
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MCQOPTIONS
| 1. |
Heat exchange between two black surfaces enclosed by an insulated surface is given by |
| A. | Q <sub>12</sub> = A <sub>1</sub> σ <sub>b </sub>(T <sub>1</sub><sup>4</sup> – T<sub>2</sub><sup>4</sup>) [A <sub>2 </sub>– A <sub>1</sub> F <sub> 12</sub><sup>2</sup>/A <sub>1</sub> + A <sub>2 </sub>– 2 A <sub>1</sub> F <sub>12</sub>]. |
| B. | Q <sub>12</sub> = 2 A <sub>1</sub> σ <sub>b </sub>(T <sub>1</sub><sup>4</sup> – T<sub>2</sub><sup>4</sup>) [A <sub>2 </sub>– A <sub>1</sub> F <sub> 12</sub><sup>2</sup>/A <sub>1</sub> + A <sub>2 </sub>– 2 A <sub>1</sub> F <sub>12</sub>]. |
| C. | Q <sub>12</sub> = 3 A <sub>1</sub> σ <sub>b </sub>(T <sub>1</sub><sup>4</sup> – T<sub>2</sub><sup>4</sup>) [A <sub>2 </sub>– A <sub>1</sub> F <sub> 12</sub><sup>2</sup>/A <sub>1</sub> + A <sub>2 </sub>– 2 A <sub>1</sub> F <sub>12</sub>]. |
| D. | Q <sub>12</sub> = 4 A <sub>1</sub> σ <sub>b </sub>(T <sub>1</sub><sup>4</sup> – T<sub>2</sub><sup>4</sup>) [A <sub>2 </sub>– A <sub>1</sub> F <sub> 12</sub><sup>2</sup>/A <sub>1</sub> + A <sub>2 </sub>– 2 A <sub>1</sub> F <sub>12</sub>]. |
| Answer» B. Q <sub>12</sub> = 2 A <sub>1</sub> ‚âà√¨‚àö√¢ <sub>b </sub>(T <sub>1</sub><sup>4</sup> ‚Äö√Ñ√∂‚àö√ë‚àö¬® T<sub>2</sub><sup>4</sup>) [A <sub>2 </sub>‚Äö√Ñ√∂‚àö√ë‚àö¬® A <sub>1</sub> F <sub> 12</sub><sup>2</sup>/A <sub>1</sub> + A <sub>2 </sub>‚Äö√Ñ√∂‚àö√ë‚àö¬® 2 A <sub>1</sub> F <sub>12</sub>]. | |