Question 25

The Correct Answer is A The air receiver (or storage tank) serves several critical functions in a compressed air system, one of which is to act as a buffer between the compressor and the demands of the system. **By providing a large volume for the air to collect and stabilize before entering the main distribution lines, the receiver effectively dampens the pressure fluctuations and surges (pulsations) created by the cycling action of reciprocating or screw compressors.** This helps ensure a smoother, more consistent flow and pressure downstream, protecting equipment and improving performance. **Why the other options are incorrect:** * **B) remove all traces of oil from the air:** Removing oil is the primary function of specialized filtration components, specifically coalescing filters and oil-removal filters, which are installed downstream of the receiver. While some oil vapor might condense in the receiver, it is not its primary or comprehensive function to remove "all traces" of oil. * **C) dry the air discharged from the intercooler:** Drying the air (removing water vapor) is the function of air dryers (such as refrigerated or desiccant dryers), which are typically installed after the receiver. While water vapor will condense into liquid water inside the receiver as the air cools, the tank itself is not a dryer designed to reduce the relative humidity or dew point of the air to acceptable system levels. * **D) receive exhaust air from pneumatic accessories:** The air receiver contains pressurized air *supplied* to pneumatic accessories. Exhaust air from tools and equipment is discharged directly into the atmosphere, not routed back into the pressurized storage tank.