*$_Double pipe heat exchangers are preferably useful, when? – McqOptions

MCQOPTIONS

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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