| 6. | The rate equation used to describe the mechanism of convection is called Newton’s law of cooling. So rate of heat flow by convection doesn’t depend on |
| a. | Convective heat transfer coefficient |
| b. | Surface area through which heat flows |
| c. | Time |
| d. | Temperature potential difference |
| View Answer Report Discuss 50-50! |
|
Answer: (c).Time
|
| 7. | How many types of convection process are there? |
| a. | One |
| b. | Three |
| c. | Four |
| d. | Two |
| View Answer Report Discuss 50-50! |
|
Answer: (b).Three
|
| 8. | Thermal conductivity is maximum for which substance |
| a. | Silver |
| b. | Ice |
| c. | Aluminum |
| d. | Diamond |
| View Answer Report Discuss 50-50! |
|
Answer: (d).Diamond
|
| 9. | A radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body |
| a. | 697.2 W/m² |
| b. | 786.9 W/m² |
| c. | 324.7 W/m² |
| d. | 592.1 W/m² |
| View Answer Report Discuss 50-50! |
|
Answer: (a).697.2 W/m²
|
| 10. | Which of the following is an example of forced convection? |
| a. | Chilling effect of cold wind on a warm body |
| b. | Flow of water in condenser tubes |
| c. | Cooling of billets in the atmosphere |
| d. | Heat exchange on cold and warm pipes |
| View Answer Report Discuss 50-50! |
|
Answer: (b).Flow of water in condenser tubes
|