| 1. |
Consider system A at uniform temperature t and system B at another uniform temperature T (t > T). Let the two systems be brought into contact and be thermally insulated from their surroundings but not from each other. Energy will flow from system A to system B because of
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| a. | Temperature difference |
| b. | Energy difference |
| c. | Mass difference |
| d. | Volumetric difference |
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Answer: (a).Temperature difference
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| 2. | The literature of heat transfer generally recognizes distinct modes of heat transfer. How many modes are there? |
| a. | One |
| b. | Two |
| c. | Three |
| d. | Four |
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Answer: (c).Three
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| 3. | An oil cooler in a high performance engine has an outside surface area 0.12 m² and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m² K. Find out the heat transfer rate? |
| a. | 238.43 W |
| b. | 190.68 W |
| c. | 543.67 W |
| d. | 675.98 W |
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Answer: (b).190.68 W
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| 4. | Unit of rate of heat transfer is |
| a. | Joule |
| b. | Newton |
| c. | Pascal |
| d. | Watt |
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Answer: (d).Watt
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| 5. | Convective heat transfer coefficient doesn’t depend on |
| a. | Surface area |
| b. | Space |
| c. | Time |
| d. | Orientation of solid surface |
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Answer: (a).Surface area
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