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Heat Transfer

Heat Transfer
The unit of conductance in SI unit is

W/m²
W/m
W/°K
W/m°K

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Heat Transfer
For what value of Prandtl number, the Col-burn analogy is valid ?

0.6 to 120
l to 50
1 to 103
0.06 to 120

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Heat Transfer
Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is __________ law.

Dalton's
Stefan's
Kirchoffs
Wien's

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Heat Transfer
The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities εx & εy is given by

1/εx + 1/εy
(εx + εy)/(εx + εy - εx . εy)
Εx . εy
Εx + εy

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Heat Transfer
Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats

R and S
P and R
P and S
P and Q

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Heat Transfer
Choose the correct equation.

Nu = (Re)(Pr)
Nu = (Re) (Pr) (Gz)
Nu = (Pr)(St)
Nu = (Re) (Pr) (St)

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