Which of the following air compressors are commonly used inside ventilators? I. fluidic II. piston and cylinder III. turbine IV. bellows

A. I, III only
B. II, IV only
C. I, III, IV only
D. II, III, IV only

ANS: D?I. Incorrect response: Control circuits can be fluidic, not compressors. Fluidic circuits are analogs of electronic logic circuits. Fluidic circuits use small amounts of gas flow to generate signals that operate timing systems and pressure switches.
II. Correct response: Piston and cylinder is one of three types of small compressors used inside certain ventilators.
III. Correct response: Turbine compressors are another type of compressor used inside some ventilators.
IV. Correct response: Bellows compressors are a third type of compressor housed inside some older-generation ventilators.?