What compressors move gases by turning a set of screws, lobes, or vanes?
A. Axial compressors
B. Rotary compressors
C. Centrifugal compressors
D. Reciprocating compressors
A. Incorrect. Axial compressors are dynamic compressors in which the flow of gas is axial or parallel to the shaft.
B. Correct. Rotary compressors move gases by turning a set of screws, lobes, or vanes.
C. Incorrect. Centrifugal compressors are dynamic compressors in which the gas flows from the inlet, located near the suction eye, to the outer tip of the impeller blade.
D. Incorrect. Reciprocating compressors use a back-and-forth or up-and-down motion to pressurize and move gas through the device.
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