E-PolyLearning

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

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

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

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

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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