MCQOPTIONS
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MCQOPTIONS
This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 |
| Answer» C. Cooling of billets in the atmosphere | |
| 2. |
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 |
| Answer» B. 786.9 W/m2 | |
| 3. |
Thermal conductivity is maximum for which substance |
| A. | Silver |
| B. | Ice |
| C. | Aluminum |
| D. | Diamond |
| Answer» E. | |
| 4. |
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 |
| Answer» D. Temperature potential difference | |
| 5. |
Convective heat transfer coefficient doesn’t depend on |
| A. | Surface area |
| B. | Space |
| C. | Time |
| D. | Orientation of solid surface |
| Answer» B. Space | |
| 6. |
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/ m 2 K. Find out the heat transfer rate? |
| A. | 238.43 W |
| B. | 190.68 W |
| C. | 543.67 W |
| D. | 675.98 W |
| Answer» C. 543.67 W | |
| 7. |
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 |
| A. | Temperature difference |
| B. | Energy difference |
| C. | Mass difference |
| D. | Volumetric difference |
| Answer» B. Energy difference | |
| 8. |
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/m<sup>2</sup> |
| B. | 786.9 W/m<sup>2</sup> |
| C. | 324.7 W/m<sup>2</sup> |
| D. | 592.1 W/m<sup>2</sup> |
| Answer» B. 786.9 W/m<sup>2</sup> | |
| 9. |
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 |
| Answer» C. Cooling of billets in the atmosphere | |
| 10. |
Thermal conductivity is maximum for which substanc? |
| A. | Silver |
| B. | Ice |
| C. | Aluminum |
| D. | Diamond |
| Answer» E. | |
| 11. |
How many types of convection process are there? |
| A. | One |
| B. | Three |
| C. | Four |
| D. | Two |
| Answer» C. Four | |
| 12. |
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 |
| Answer» D. Temperature potential difference | |
| 13. |
Convective heat transfer coefficient doesn’t depend on$ |
| A. | Surface area |
| B. | Space |
| C. | Time |
| D. | Orientation of solid surface |
| Answer» B. Space | |
| 14. |
Unit of the rate of heat transfer is |
| A. | Joule |
| B. | Newton |
| C. | Pascal |
| D. | Watt |
| Answer» E. | |
| 15. |
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/ m 2 K. Find out the heat transfer rate? |
| A. | 238.43 W |
| B. | 190.68 W |
| C. | 543.67 W |
| D. | 675.98 W |
| Answer» C. 543.67 W | |
| 16. |
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 |
| Answer» D. Four | |