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When was the diesel engine invented? 1878 1892 1902 Correct:1892 What inspired Rudolf Diesel to invent a new kind of engine? global warming family efficiency Correct:efficiency Disturbed by the inefficiency of gasoline and steam engines, Diesel decided to devote his time to developing one with higher efficiency. What's the first step in a diesel engine's combustion process? fuel injection air compression fuel mixing Correct:diesel engines work by first compressing the air and then injecting the fuel. What lights the fuel in a diesel engine? spark plugs heat the piston Correct:heat Diesel engines, which have no spark plugs, rely on the heat of the compressed air to light the injected fuel. Which type of engine has the highest compression ratio? diesel steam gasoline Correct:diesel Higher compression ratios lead to higher efficiency and more power. While gasoline engines have compression ratios of 10-to-1, diesel engines compress at a ratio as high as 25-to-1. What might smaller diesel engines and diesel engines without advanced computer control use to start on a cold day? spark plugs glow plugs toaster plugs glow plugs On cold days, when the compression process is not enough to raise the air to a high enough temperature to ignite the fuel, some engines use glow plugs to get the job done. What percentage of shipped freight relies on diesel? 50 percent 75 percent 94 percent Correct:94 percent Responsible for the shipment of about 94 percent of freight, diesel is an integral part of the economy. Why does diesel fuel evaporate slower than gasoline? its boiling point is lower it's heavier it's oilier Correct:it's heavier Diesel fuel has more carbon atoms in longer chains than gasoline does, making it heavier and causing it to slowly evaporate. Which of the following technologies has helped reduce some of diesel's harmful emissions? catalytic converters diesel daubers smaller engines Correct:catalytic converters CRT particulate filters and catalytic converters burn soot and reduce particulate matter, carbon monoxide and hydrocarbons by as much as 90 percent. What's biodiesel made from? recycled plastics petroleum plant oils and animal fats Correct:plant oils and animal fats Biodiesel is an alternative or additive to diesel fuel that can be used in diesel engines with little to no modifications to the engines themselves. It's not made from petroleum -- instead it comes from plant oils or animal fats that have been chemically altered. |