What does a Cetane Number refer to?

Prepare for the 2nd Class Power Engineering (2B1) Exam. Study with flashcards and multiple choice questions, each question offers hints and detailed explanations. Ensure you're ready for success!

A Cetane Number is a numerical measure that indicates the self-ignition capability of diesel fuel. In other words, it reflects how easily and quickly the fuel ignites in the combustion chamber when injected under pressure. A higher Cetane Number signifies that the fuel can ignite more readily upon injection, which contributes to smoother and more efficient combustion, reducing engine noise and emissions.

This property is crucial for diesel engines because they rely on compression ignition rather than using a spark plug as in gasoline engines. Thus, the self-ignition capability is a key factor in engine performance, fuel efficiency, and overall emissions.

The other options, while related to diesel fuel characteristics, do not accurately represent what the Cetane Number specifically measures. The ignition temperature refers to the temperature at which fuel ignites without external ignition sources. Viscosity refers to the thickness or flow characteristics of the fuel, affecting how easily it can be pumped and atomized. Volatility describes how readily a fuel evaporates, affecting its vaporization and subsequent combustion. These aspects are important, but they are distinct properties from what the Cetane Number conveys about diesel fuel.

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