In how many categories heat exchangers are classified on the basis of mechanical design of heat exchanger surface?

In how many categories heat exchangers are classified on the basis of

1.	In how many categories heat exchangers are classified on the basis of mechanical design of heat exchanger surface?
A.	2
B.	4
C.	1
D.	3
Answer» E.

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In how many categories heat exchangers are classified on the basis of mechanical design of heat exchanger surface?

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