Question 92Motor Plants - Assistant Engineer

The correct answer is A) higher. When a diesel engine is operating at a light load, it requires less fuel to produce the necessary power. This results in a higher air/fuel ratio compared to when the engine is operating at a heavy load. At heavy load, the engine requires more fuel to produce the necessary power, leading to a lower air/fuel ratio. The other options are incorrect because: B) lower - This is the opposite of the correct answer, as the air/fuel ratio is higher at light load. C) equal - The air/fuel ratio will not be equal at different load conditions, as it changes based on the fuel requirement. D) directly proportional - The air/fuel ratio is inversely proportional to the load, not directly proportional.