The interchange factor for radiation heat transfer from surface ‘x� – McqOptions

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1.	The interchange factor for radiation heat transfer from surface ‘x’ to surface ‘y’ in case of an infinite parallel planes with emissivities εx & εy is given by_______________?
A.	εx + εy
B.	εx . εy
C.	1/εx + 1/εy
D.	(εx + εy)/( εx + εy – εx . εy)
Answer» E.

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