| 21. | The temperature distribution profile for a solid cylinder is |
| a. | Parabolic |
| b. | Linear |
| c. | Ellipse |
| d. | Hyperbolic |
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Answer: (a).Parabolic
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| 22. | A slab of 12 cm thickness and generating heat uniformly at 10⁶ W/m³ has thermal conductivity of 200 W/m degree. Both surfaces of the slab are maintained at 150 degree Celsius. Determine the heat flow rate at the quarter planes
 |
| a. | 30000 W/m² |
| b. | 40000 W/m² |
| c. | 50000 W/m² |
| d. | 60000 W/m² |
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Answer: (a).30000 W/m²
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| 23. | Consider a convective heat flow to water at 75 degree Celsius from a cylindrical nuclear reactor fuel rod of 50 mm diameter. The rate of heat generation is 50000000 W/m³ and convective heat transfer coefficient is I kW/m² K. The outer surface temperature of the fuel element would be |
| a. | 625 degree Celsius |
| b. | 700 degree Celsius |
| c. | 550 degree Celsius |
| d. | 400 degree Celsius |
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Answer: (b).700 degree Celsius
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| 24. | For a cylindrical rod with uniformly distributed heat sources, the thermal gradient at half the radius location will be |
| a. | Four times |
| b. | Twice |
| c. | One fourth |
| d. | One half |
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Answer: (d).One half
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| 25. | Consider heat conduction through a solid sphere of radius R. There are certain assumptions
(i) Unsteady state conditions (ii) One-dimensional radial conduction (iii) Constant thermal conductivity Identify the correct statements |
| a. | i and iii |
| b. | ii and iii |
| c. | i, ii and iii |
| d. | i and ii |
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Answer: (b).ii and iii
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