Question 48General Subjects - QMED

The correct answer is D) allow the motor to turn the compressor opposed only by friction. The unloading system on an air compressor is designed to reduce the compressor's load when starting, which allows the motor to turn the compressor opposed only by the friction of the mechanical components. This reduces the startup load and allows the compressor to reach operating speed more easily. The other options are incorrect because the unloading system does not increase compressor operating speed, reduce frictional load during operation, or increase discharge pressure on demand - its primary function is to facilitate an easier startup by reducing the initial load on the compressor.