Discussion
The thermal efficiency of two stroke cycle engine is_____ a four stroke cycle engine.
Answer: C
The thermal efficiency of a two stroke engine is less than that of a four stroke engine.
In a two stroke engine the exhaust and fresh charge overlap during scavenging, so some fresh charge escapes with the exhaust and some exhaust stays in the cylinder. The effective compression stroke is also shorter because the ports occupy part of it.
These losses lower its thermal efficiency, even though it gives more power for its size, so 'equal to', 'greater than' and 'three times more' are all wrong.
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