Question 39Motor Plants - Assistant Engineer

The correct answer is A) Higher compression ratios create higher temperatures. In an internal combustion engine, the compression ratio is the ratio of the maximum volume of the combustion chamber to the minimum volume. As the compression ratio increases, the air-fuel mixture is compressed to a smaller volume, which in turn increases the temperature and pressure in the combustion chamber. This higher temperature created by the higher compression ratio is necessary for the fuel to ignite and efficiently combust, generating the power required to drive the engine. The other options are incorrect because: B) and C) have the relationship reversed - the temperature does not create the compression ratio, but rather the compression ratio determines the temperature. D) is the opposite of the correct relationship, as higher compression ratios create higher temperatures, not lower temperatures.