A compressor has a capacity rating of 5 m/min. What does this 5 m/min measurement indicate_______________?
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Answer: B. free air
Explanation
Compressor capacity ratings are conventionally expressed in terms of free air delivered under ambient atmospheric conditions. Free air standardizes volumetric output measurements regardless of intake temperature, humidity, and atmospheric pressure variations. Expressing capacity as free air allows engineers to compare different compressor models using a consistent volumetric baseline. Free air refers to ambient air at the specific atmospheric conditions existing at the compressor intake location. Air compressors intake atmospheric gas and reduce its volume, increasing pressure before delivering it to storage receivers. Volumetric efficiency calculations compare actual delivered free air volume against the theoretical displacement of the cylinders.
Option A refers generally to standard air reference conditions, but compressor rating nomenclature specifically uses free air. Option C describes compressed air within the vessel, which varies in volume depending on system operating pressure. Option D measures air at delivery pressure, which does not provide a universal standard for comparing volumetric compressor sizes.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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