Question 268Motor Plants - Assistant Engineer70% to pass
A mixture of 45% cetane and 55% alpha-methyl-naphthalene is found to have the same ignition delay as a sample of diesel oil. The sample can be described as having a/an _______________.
AI Explanation
The correct answer is B) cetane number of 45.
The cetane number is a measure of the ignition quality of a fuel, with higher cetane numbers indicating better ignition and combustion characteristics. Since the given mixture has the same ignition delay as diesel oil, it can be described as having a cetane number of 45, which is the typical cetane number range for diesel fuels.
The other options are incorrect because:
A) A cetane number of 55 would indicate a higher ignition quality than the diesel oil sample.
C) The octane number is a measure of the antiknock properties of a fuel, which is not relevant for this diesel fuel mixture.
D) A cetane number of 45 is more accurate than 55 for describing the ignition characteristics of the given mixture.
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