Final answer:
The excessive moisture in an air reservoir tank can be caused by a failed air dryer purge valve or a clogged air compressor intake. Regular maintenance and cleaning of these components can help prevent moisture buildup.Option D is the correct answer.
Step-by-step explanation:
The excessive amount of moisture in an air reservoir tank can be caused by a failed air dryer purge valve. When the air dryer purge valve fails, it is unable to remove the moisture from the compressed air, resulting in a buildup of moisture in the tank. This can lead to problems in the air system, such as corrosion and damage to downstream components.
One way to prevent excessive moisture in the air reservoir tank is to regularly check and maintain the air dryer purge valve. If the valve is found to be faulty, it should be replaced to ensure proper functioning of the air system.
Another possible cause of excessive moisture could be a clogged air compressor intake. When the intake is clogged, it can restrict the flow of air into the compressor, causing it to work harder and produce more moisture. Regular cleaning and maintenance of the air compressor intake can help prevent this issue.