In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.

In case of heat transfer by conduction in a hollow cylinder, _________

1.	In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.
A.	geometric
B.	arithmetic
C.	logarithmic
D.	either (a), (b) or (c)
Answer» D. either (a), (b) or (c)

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In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.

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