What type of compressor uses the inward stroke of a piston or diaphragm to draw gas into a chamber (intake) and then positively displace the gas using an outward stroke (discharge)?

A) Axial
B) Rotary
C) Reciprocating
D) Positive-displacement


Answer: C
Explanation: A) Incorrect. An axial compressor uses a series of rotor blades with a set of stator blades between each rotating wheel to move gases axially along the shaft.
B) Incorrect. A rotary compressor is a positive-displacement compressor that uses a rotating motion to move gases.
C) Correct. A reciprocating compressor uses the inward stroke of a piston or diaphragm to draw gas into a chamber (intake) and then positively displace the gas using an outward stroke (discharge).
D) Incorrect. Positive-displacement compressors use screws, pistons, sliding vanes, lobes, gears, or diaphragms to deliver a set volume of gas with each stroke.

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