Question 48 QMED01 - Junior Engineer

The Correct Answer is A **Explanation for Option A (Correct):** The air receiver (or storage tank) acts as a buffer. Reciprocating compressors, in particular, produce intermittent high-pressure pulses of air. When the compressed air leaves the compressor and enters the receiver, the receiver's large volume absorbs and dampens these pressure fluctuations. By evening out the pressure peaks and troughs, the receiver minimizes the system's line pulsations, ensuring a steadier, more uniform pressure supply downstream to the equipment. **Explanation for Incorrect Options:** * **B) dry the air discharged from the intercooler:** While some water vapor condenses in the receiver due to cooling, the primary function of drying the air (removing significant moisture) is performed by dedicated air drying equipment, such as refrigerated dryers or desiccant dryers, which are typically installed after the receiver. * **C) receive exhaust air from pneumatic accessories:** The air receiver stores compressed air supplied *to* the accessories. Exhaust air from pneumatic tools and accessories is typically vented directly to the atmosphere. * **D) remove all traces of oil from the air:** Removing oil traces is the function of specific filters (e.g., coalescing filters or activated carbon filters) placed downstream of the receiver. While the receiver can trap some oil carryover, it is not designed or effective for removing *all traces* of oil.