Which of the following is an accurate statement? A. An important distinction bet

Question

Which of the following is an accurate statement?
A. An important distinction between the Diesel cycle and the Otto cycle is that there is no fuel in the cylinder at the beginning of the compression stroke and no spark plug is used.
B. An important distinction between the Diesel cycle and the Otto cycle is that for the Diesel cycle high efficiencies may be obtained with low compression ratios.
C. Because a Diesel engine requires no fuel ignition system, Diesel engines tend to be lighter and easier to start than a comparable gasoline engine.
D. The efficiency of the Otto cycle does not depend on the compression ratio.
E. A typical gasoline engine has an efficiency of about 2%.

Explanation / Answer

The way a diesel engine compares to a otto cycle is that with a diesel engine there is no fuel in the cylinder at the beginning of the compression stroke, because of this the air is able to be compressed to a higher ratio, and when the fuel is added later during the compression, the pressure and temperature inside of the cylinder is so high that once the fuel is injected the fuel ignites spontaneously. Thus there is no need for a spark plug. So long story short, the answer is: A. An important distinction between the Diesel cycle and the Otto cycle is that there is no fuel in the cylinder at the beginning of the compression stroke and no spark plug is used.

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