Question 72Motor Plants - QMED

The correct answer is D) adjusting the radiator louvers. In a diesel engine closed fresh water cooling system with a radiator, the proper water temperature can be obtained by adjusting the radiator louvers. The radiator louvers control the airflow across the radiator, which in turn regulates the cooling of the circulating fresh water. By adjusting the louvers, the amount of airflow can be increased or decreased to maintain the desired water temperature, without the need for additional cooling components like a space heater or lube oil cooler. The other options are incorrect because they do not directly adjust the radiator's cooling capacity. Passing cooling water through a space heater (A) or lube oil cooler (B) would not provide the necessary temperature control, and piping exhaust gases across the radiator front (C) would be an unconventional and inefficient method of cooling the system.