Question 22Motor Plants - Assistant Engineer
70% to passOn the cylinder indicator diagram illustrated, the dotted line indicated as 'L' is describing the _______________. Illustration MO-0033
Acylinder pressure without injection
Bfiring pressure at 90 degrees crank angle
Cbeginning of compression
Dpower expansion curve
AI Explanation
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.
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