Which of the following type(s) of air compressors is (are) used in bulk supply systems? 1. Piston 2. Rotary 3. Liquid air 4. Diaphragm
a. 1 and 4 c. 1 and 2
b. 1 and 3 d. 2
ANS: C
To power a bulk air supply, either a piston or a rotary compressor is necessary. Liquid air is not used as a source for bulk supply. A diaphragm air compressor could not keep up with the re-quirements of a bulk system.
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