Massachusetts Wastewater Practice Exam

A clogged air filter is a common and likely cause for an air compressor not putting out air. The air filter is responsible for removing dust, dirt, and other particulates from the air before it enters the compressor. When the filter becomes clogged, it restricts airflow into the system. This lack of sufficient air severely hampers the compressor’s ability to function effectively, resulting in little or no air being delivered.

While a cracked intake valve could also lead to air loss, it typically would manifest as air escaping rather than a complete lack of output. Oil leakage, on the other hand, can damage the compressor and reduce its efficiency, but it doesn't inherently prevent the compressor from producing air. Lastly, low ambient temperatures can affect compressor performance, though they usually do not result in a complete failure to produce air. Instead, they might cause issues like increased viscosity of lubricants or frost formation that can affect operation but not entirely halt air output.