Question 267Motor Plants - Assistant Engineer70% to pass
Which of the following statements is true concerning the cetane number of diesel fuel?
AI Explanation
You are correct, the statement "Ignition lag is reduced with fuels having a high cetane number" is the true statement concerning the cetane number of diesel fuel.
The cetane number is a measure of the fuel's ignition quality, with higher cetane numbers indicating better ignition properties. Fuels with higher cetane numbers have shorter ignition delays, meaning the time between fuel injection and the start of combustion is reduced. This shorter ignition lag allows for more efficient combustion and better engine performance.
The other options are incorrect because: A) the cetane number does not affect the amount of injection lag, which is determined by the fuel injection system design; B) the cetane number is not an indication of fuel viscosity, which is a separate fuel property; and D) the cetane number is in fact very significant in the diesel combustion process, as it determines the fuel's ignition characteristics.
Related Questions
#265 The ignition quality of diesel fuel becomes LESS critical as_______________. #266 The cetane number rates fuels for diesel engines according to its_______________.#268 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 _______________. #269 If a particular liquid has a specific gravity of 0.96 kg/dm3 at 77°F, what will be the specific gravity of the liquid, as determined from the graph shown in the illustration, if the temperature is increased to 167°F? Illustration MO-0113 #270 For optimum results, centrifugal purification of heavy fuel oil should be accomplished with the fuel at the lowest practicable_______________.