Question 22Motor Plants - Assistant Engineer

The correct answer is A) cylinder pressure without injection. The dotted line labeled 'L' on the cylinder indicator diagram represents the cylinder pressure without injection. This means it shows the pressure in the cylinder due to compression and expansion of the air, without the additional pressure caused by the fuel injection and combustion process. The other answer choices are incorrect because: B) describes the firing pressure at a specific crank angle, C) refers to the start of compression, and D) represents the power expansion curve after combustion, which is a different part of the indicator diagram.