Double pipe heat exchangers are preferably useful, when

1.	Double pipe heat exchangers are preferably useful, when
A.	high viscosity liquid is to be cooled.
B.	requirement of heat transfer area is low.
C.	overall heat transfer co-efficient is very high.
D.	a corrosive liquid is to be heated.
Answer» C. overall heat transfer co-efficient is very high.

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Double pipe heat exchangers are preferably useful, when

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