Question 132Motor Plants - QMED

The correct answer is A) Higher compression ratios create higher temperatures. The reason for this is that as the compression ratio of an engine increases, the temperature in the combustion space also increases. This is due to the basic principles of thermodynamics - as a gas is compressed, its temperature rises. Higher compression ratios mean the air/fuel mixture is compressed to a greater degree before ignition, which results in higher temperatures in the combustion chamber. The other options are incorrect because: B) is the opposite of the correct relationship, C) lower temperatures do not create higher compression ratios, and D) higher compression ratios actually create higher, not lower, temperatures.