FAA Ground School Practice Test

What is a common consequence of excessively high engine temperatures?

1. Increased fuel efficiency

2. Increase in engine weight

3. Loss of power, excessive oil consumption, and possible permanent internal engine damage

4. Improved engine performance

The correct answer is: Loss of power, excessive oil consumption, and possible permanent internal engine damage

Excessively high engine temperatures can significantly impact the performance and longevity of an engine. When temperatures rise beyond the optimal operating range, several detrimental effects can occur. One of the primary consequences is a loss of power. High temperatures can lead to reduced engine efficiency, which means less power output for the same amount of fuel consumed. In a similar vein, excessive heat can result in increased oil consumption. This happens because the oil, which is designed to lubricate the engine components, can break down and become less effective when exposed to extreme heat over time, leading to a faster depletion of oil. Furthermore, sustained high temperatures can cause permanent internal engine damage. Components such as pistons, cylinders, and valve seats can warp or wear out more quickly, leading to costly repairs or even total engine failure. This damaging process may include issues like seizures, scoring, or the formation of cracks in critical parts of the engine. In contrast, the other choices do not accurately reflect the consequences of high engine temperatures. For instance, there is a noted decrease in fuel efficiency rather than an increase, and engine weight does not change significantly as a direct result of rising temperatures. Lastly, performance improvements are not a characteristic of excessively high temperatures; rather, they are indicative of