E-PolyLearning

11. Regarding one dimensional heat transfer, choose the correct statement
a. Steady- f (x), Unsteady- f (x, t)
b. Steady- f (x, t), Unsteady- f (x)
c. Steady- f (x, y, t), Unsteady- f (x)
d. Steady- f (y, z), Unsteady- f (y)
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Answer: (d).Steady- f (y, z), Unsteady- f (y)

12. Which statement is true regarding steady state condition?
a. There is a variation in temperature in the course of time
b. Heat exchange is constant
c. It is a function of space and time coordinates
d. Internal energy of the system changes
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Answer: (b).Heat exchange is constant

13. Which of the following is an example of steady state heat transfer?
a. Boilers and turbines
b. Cooling of I.C engine
c. Chilling effect of cold wind on a warm body
d. Electric bulb cools down by the surrounding atmosphere
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Answer: (d).Electric bulb cools down by the surrounding atmosphere

14. Heat transfer in a long, hollow cylinder which is maintained at uniform but different temperatures on its inner and outer surfaces may be assumed to be taking place in which direction?
a. Axial only
b. Unpredictable
c. Radial only
d. No heat transfer takes place
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Answer: (c).Radial only

15. Heat transfer takes place according to which law?
a. Newton’s law of cooling
b. Second law of thermodynamics
c. Newton’s second law of motion
d. First law of thermodynamics
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Answer: (b).Second law of thermodynamics

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