a) Shell and tube Heat exchanger, Plate heat exchangers
b) Steam injectors, plate heat exchangers
c) Cooling towers, Plate heat exchangers
d) Steam injectors, cooling towers
Answer: d
Explanation: In direct heat exchangers, there is a direct contact between the two immiscible fluids for transferring the heat. Cooling towers, jet condensers, steam injectors are the examples of direct heat exchangers.
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