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Engine classification terminology: diesel engines are also known as what type? Fill the blank with the standard engine classification term. Choose the correct option.

Difficulty: Easy

Spark-ignition engines
Constant-volume engines
Compression-ignition engines
External-combustion engines

Correct Answer: Compression-ignition engines

Explanation:

Concept
Diesel engines are compression-ignition (CI) engines: fuel auto-ignites due to high temperature produced by compressing air. Spark-ignition (SI) uses an electric spark, while EC engines (e.g., steam) burn fuel outside the working cylinder.

Final Answer
Compression-ignition engines

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