E-PolyLearning

16. Following number is called the __________ number.
a. Peclet
b. Stanton
c. Graetz
d. none of these
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Answer: (c).Graetz

17. What is the logarithmic mean of r1 and r2 ?
a. A
b. B
c. C
d. D
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Answer: (a).A

18. The following equation is the __________ analogy.
a. Colburn
b. Reynolds
c. Prandtl
d. None of these
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Answer: (a).Colburn

19. The number given below is termed as the __________ number.
a. Grashoff
b. Nusselt
c. Prandtl
d. Stanton
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Answer: (c).Prandtl

20. Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by following equation. This is valid for the value of NRe equal to
a. < 2100
b. 2100-4000
c. > 4000
d. > 10000
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Answer: (d).> 10000

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