At what engine RPM is the best output for a compressor typically achieved?

Answer: B — 50%

The best output for a compressor is typically achieved at around 75% of the engine's RPM. This range allows the compressor to operate efficiently without reaching the limits of engine load or potential overheating. At this level of RPM, the compressor can maximize its air output, ensuring that the braking system has adequate air supply for effective operation. Operating at lower RPMs, such as 25% or even 50%, may not generate sufficient air pressure for optimal brake performance. Conversely, running the compressor at 100% RPM could lead to increased wear and tear, potential overheating, and reduced longevity. Therefore, maintaining the compressor around 75% RPM strikes a balance between performance and reliability.