| 1. | In case of heat conduction through plane wall, which one of the following is not a correct assumption? |
| a. | Steady state |
| b. | Three dimensional heat flow |
| c. | Volumetric heat generation must be constant |
| d. | K must be constant |
| View Answer Report Discuss 50-50! |
|
Answer: (b).Three dimensional heat flow
|
| 2. | If Q X is heat generated in at distance ‘x’, then heat conducted out at a distance (x + d x) will be |
| a. | Q X + 3d (Q X) d x /d x |
| b. | 2Q X + d (Q X) d x /d x |
| c. | d (Q X) d x /d x |
| d. | Q X + d (Q X) d x /d x |
| View Answer Report Discuss 50-50! |
|
Answer: (d).Q X + d (Q X) d x /d x
|
| 3. | Notable example of uniform generation of heat within the conducting medium are
(i) Energy of a nuclear reactor (ii) Liberation of energy due to some exothermic chemical reactions (iii) Resistance heating in electrical appliances Which of the statements made above are correct? |
| a. | 1, 2 and 3 |
| b. | 1 and 2 |
| c. | 1 and 3 |
| d. | Only 2 |
| View Answer Report Discuss 50-50! |
|
Answer: (a).1, 2 and 3
|
| 4. | For a plane wall of thickness l with uniformly distributed heat generation q g per unit volume, the temperature t₀ at mid plane is given by |
| a. | t₀ = q g l²/2k +t w |
| b. | t₀ = q g l²/4k +t w |
| c. | t₀ = q g l²/8k +t w |
| d. | t₀ = q g l²/16k +t w |
| View Answer Report Discuss 50-50! |
|
Answer: (c).t₀ = q g l²/8k +t w
|
| 5. | The temperature drop in a plane wall with uniformly distributed heat generation can be decreased by reducing |
| a. | Wall thickness |
| b. | Heat generation rate |
| c. | Thermal conductivity |
| d. | Surface area |
| View Answer Report Discuss 50-50! |
|
Answer: (a).Wall thickness
|