Question 43Steam Plants - Assistant Engineer

The correct answer is C) single-pass heat exchanger. A main condenser utilizing a scoop for the circulation of sea water must be constructed as a single-pass heat exchanger. In a single-pass heat exchanger, the two fluids (in this case, the steam and the sea water) flow through the exchanger in a single, straight-through pass, with no reversal of flow direction. This configuration is best suited for a main condenser with a sea water scoop, as it allows for a simple and efficient circulation of the cooling sea water through the exchanger. The other options are incorrect because: A) a two-pass heat exchanger has the fluids pass through the exchanger twice, B) a counter-flow heat exchanger has the fluids flow in opposite directions, and D) a parallel-flow heat exchanger has the fluids flow in the same direction but through separate paths, which is not the typical configuration for a main condenser with a sea water scoop.