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 |
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Answer: (c).Convection
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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 |
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Answer: (d).Newton’s law of cooling
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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 |
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Answer: (d).Heat flow doesn’t depends on temperature
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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 |
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Answer: (d).Radiation will provide quick warmth
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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 |
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Answer: (b).During annealing of castings
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