In regenerator type heat exchanger, heat transfer takes place by

1.	In regenerator type heat exchanger, heat transfer takes place by
A.	Direct mixing of hot and cold fluids
B.	A complete separation between hot and cold fluids
C.	Flow of hot and cold fluids alternately over a surface
D.	Generation of heat again and again
Answer» D. Generation of heat again and again

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In regenerator type heat exchanger, heat transfer takes place by

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