E-PolyLearning

6. What is Nusselt number ?
a. A
b. B
c. C
d. D
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Answer: (b).B

7. The Dietus-Boelter equation for convective heat transfer given by following equation, cannot be used for
a. low Reynold's number
b. very low Grashoff number
c. molten metals
d. all (a), (b) and (c)
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Answer: (d).all (a), (b) and (c)

8. The rate of heat transfer through a pipe wall is given by following equation. For cylinder of very thin wall, q can be approximated by
a. A
b. B
c. C
d. D
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Answer: (d).D

9. Graetz number is given by
a. A
b. B
c. C
d. D
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Answer: (a).A

10. Harmonic mean temperature difference is given by
a. A
b. B
c. C
d. D
View Answer Report Discuss 50-50!
Answer: (b).B

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