Question 95Motor Plants - Assistant Engineer

The correct answer is B) After air in the cylinder is compressed. In a diesel engine, fuel is injected into the cylinder after the air has been compressed. This is because diesel engines use the heat generated by the compression of air to ignite the fuel, rather than using a spark like in a gasoline engine. By injecting the fuel after the air has been compressed, the high temperature and pressure inside the cylinder allows the fuel to ignite and burn efficiently, generating the power needed to drive the engine. The other options are incorrect because: A) Fuel is not injected before compression, as there needs to be high temperature and pressure for ignition. C) Fuel is injected during the compression stroke, not after the expansion of combustion gases. D) Fuel is not injected as air is taken into the cylinder, but rather after the air has been compressed.