Question 103Motor Plants - Assistant Engineer

The correct answer is C) cylinder pressure without injection. The dotted line labeled 'L' on the cylinder indicator diagram represents the cylinder pressure without injection. This is the pressure curve in the cylinder during the compression and expansion strokes, excluding the effects of fuel injection. The other answer choices are incorrect because: A) The power expansion curve is the solid line on the diagram, not the dotted line labeled 'L'. B) The beginning of compression is not represented by the dotted line 'L'. D) The firing pressure at 90 degrees crank angle is not what the dotted line 'L' represents.