Question 7Motor Plants - Assistant Engineer70% to pass
A diesel engine cylinder has a swept volume of 125 cubic inches and a compression ratio of 13.5 to 1. What is the clearance volume in the cylinder at top dead center?
AI Explanation
A) 10 cubic inches is the correct answer.
The clearance volume of a cylinder is the volume remaining above the piston at top dead center (TDC). This can be calculated using the formula:
Clearance volume = Swept volume / (Compression ratio - 1)
Given:
- Swept volume = 125 cubic inches
- Compression ratio = 13.5 to 1
Plugging these values into the formula:
Clearance volume = 125 / (13.5 - 1) = 125 / 12.5 = 10 cubic inches
The other answer choices are incorrect because they do not match the result of this calculation. For example, 12.5 cubic inches would correspond to a compression ratio of 11 to 1, which is different from the given value of 13.5 to 1.
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