| 16. | Heat transfer takes place in liquids and gases is essentially due to |
| a. | Radiation |
| b. | Conduction |
| c. | Convection |
| d. | Conduction as well as convection |
| View Answer Report Discuss 50-50! |
|
Answer: (c).Convection
|
| 17. | The appropriate rate equation for convective heat transfer between a surface and adjacent fluid is prescribed by |
| a. | Newton’s first law |
| b. | Wein’s displacement law |
| c. | Kirchhoff’s law |
| d. | Newton’s law of cooling |
| View Answer Report Discuss 50-50! |
|
Answer: (d).Newton’s law of cooling
|
| 18. | Identify the wrong statement. |
| a. | The process of heat transfer is an irreversible process |
| b. | For heat exchange, a temperature gradient must exist |
| c. | A material medium is not necessary for heat transmission |
| d. | Heat flow doesn’t depends on temperature |
| View Answer Report Discuss 50-50! |
|
Answer: (d).Heat flow doesn’t depends on temperature
|
| 19. | During a cold winter season, a person prefers to sit near a fire. Which of the following modes of heat transfer provides him the maximum heat? |
| a. | Conduction from the fire |
| b. | If it is near the fire, convection sounds good |
| c. | Convection and radiation together |
| d. | Radiation will provide quick warmth |
| View Answer Report Discuss 50-50! |
|
Answer: (d).Radiation will provide quick warmth
|
| 20. | Most unsteady heat flow occurs |
| a. | Through the walls of the refrigerator |
| b. | During annealing of castings |
| c. | Through the walls of the furnace |
| d. | Through lagged pipe carrying steam |
| View Answer Report Discuss 50-50! |
|
Answer: (b).During annealing of castings
|