Question 235Motor Plants - Assistant Engineer

The correct answer is B) higher than raw water cooled installations. The reasoning is that in a keel cooler installation, the reduction gear lube oil is cooled by the relatively warm seawater circulating through the keel cooler, rather than the raw water that would be used in a raw water cooled installation. Since the seawater in the keel cooler is warmer than the raw water, the reduction gear lube oil temperature will be higher in a keel cooler installation compared to a raw water cooled installation. The other options are incorrect because A) and D) state that the temperatures would be lower, which is the opposite of the correct answer, and C) states the temperatures would be identical, when in fact they are higher in a keel cooler system.