Engineman (EN) A School Test 1 Practice Test

In an opposed-piston engine, what is the position called when the pistons are at their minimum separation?

Outer dead center Top dead center Inner dead center Mid-stroke

Correct Answer:

Inner dead center

Explanation:

In an opposed-piston engine, two pistons move toward and away from each other inside the same cylinder. The pistons are closest together at the point called inner dead center, because that’s the position where the inner faces meet and the compression is at its peak. This is the end of the compression stroke just before ignition. The farthest apart position is outer dead center, while mid-stroke is any point between the extremes. So the minimum separation is inner dead center.

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