| 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)
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| 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
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| 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
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| 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
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| 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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