MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 3 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. |
Air at 20 degree Celsius flows over a flat surface maintained at 80 degree Celsius. The local heat flow at a point was measured as 1250 W/m2 .Take thermal conductivity of air as 0.028 W/m K, calculate the temperature at a distance 0.5 mm from the surface |
| A. | 57.682 degree celsius |
| B. | 67.682 degree celsius |
| C. | 77.682 degree celsius |
| D. | 87.682 degree celsius |
| Answer» B. 67.682 degree celsius | |
| 2. |
The temperature profile at a particular location on a surface is prescribed by the identity(t s t) / (t s t infinity) = (1/2) (y/0.0075) 3 + (3/2) (y/0.0075) |
| A. | nIf thermal conductivity of air is stated to be 0.03 W/m K, determine the value of convective heat transfer coefficient |
| B. | 4 W/m<sup>2 </sup>K |
| C. | 5 W/m<sup>2 </sup>K |
| D. | 6 W/m<sup>2 </sup>K |
| E. | 7 W/m<sup>2 </sup>K |
| Answer» D. 6 W/m<sup>2 </sup>K | |
| 3. |
Consider the above problem, make calculations for the rate of heat dissipation from the cylinder fins by convection when motor cycle is moving at 60 km/hr and convective coefficient is 75 W/m2 K |
| A. | 9640 W |
| B. | 9540 W |
| C. | 9440 W |
| D. | 9340 W |
| Answer» C. 9440 W | |