Question 46Motor Plants - Assistant Engineer

The correct answer is B) maximum pressure in the engine cylinders during injection. The minimum fuel oil delivery pressure required for efficient injection primarily depends on the maximum pressure in the engine cylinders during the injection period. This is because the fuel oil needs to be injected against the high cylinder pressure in order to atomize the fuel properly and achieve efficient combustion. The other factors, such as air turbulence, quantity of fuel, and injection delay period, are also important, but the cylinder pressure is the primary determinant of the required fuel delivery pressure. The other answer choices are incorrect because they do not directly relate to the primary factor that determines the minimum fuel delivery pressure for efficient injection.