Question 74Motor Plants - QMED

The correct answer is B) increase jacket water temperature for easier starting in cold weather. The electric heater built into some smaller diesel engines is used to increase the jacket water temperature for easier starting in cold weather. This helps the engine warm up more quickly, reducing the amount of cranking required to start the engine in cold conditions. Increasing the jacket water temperature facilitates the engine's warm-up process, making it easier to start the engine, especially in cold environments. The other options are incorrect because: A) increasing air inlet temperature is not the primary purpose of the electric heater, C) the electric heater does not directly increase the compression ratio, and D) raising lube oil viscosity is not the main function of the electric heater in this context.