Which of the following is a common symptom of a malfunctioning pneumatic system?

A common symptom of a malfunctioning pneumatic system is the presence of unusual vibrations or noise. This behavior often indicates underlying issues within the system such as air leaks, mechanical wear, or misalignment of components. These problems can disrupt the normal operation of pneumatic devices, leading to either excessive wear or the possibility of failure.

Vibrations or unusual noises can also signify that components like valves or actuators are not operating as they should, which can affect performance and efficiency. Identifying these symptoms is crucial for timely maintenance and troubleshooting, helping to avoid more significant problems and ensuring the system operates smoothly.

In contrast, options that suggest consistently high pressure readings and increased energy efficiency do not typically indicate a malfunction, as these may reflect a properly functioning system under certain conditions. Rapid operation of actuators, while it can indicate an efficiency issue or incorrect settings, does not inherently signal malfunction—depending on the context, it could also indicate a system operating as intended.