Primary drive mechanisms used by modern ventilators include which of the following? 1. Compressed gas or reducing valve 2. Hydraulic or fluidic compressor 3. Electrical motor or compressor
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: B
Drive mechanisms can be either (1) a direct application of compressed gas via a pressure reducing valve or (2) an indirect application via an electrical motor or compressor.
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