What type of lubrication does the GWL Series compressor use?

A. Increase noise B. Reduce efficiency C. Intelligent and energy-saving D. Reduce maintenance Answer: C. Intelligent and energy-saving

A. Cylinder head and air liner B. Piston and piston rod C. Valve assemblies and lubrication systems D. These are all answers: D. all of the above are

A. 5% B. 11% C. 20% D. 30% answer: B Analysis: For every 1000 meters increase in altitude, the air density drops by about 11%.

A. Low level of protection B. High level of protection C. Low power D. High noise answer: B. high protection level

A.≤0.5%FS B.≤1%FS C.≤1.5%FS D.≤ 2% FS Answer: A Analysis: Environmentally friendly oil-free air compressors need to meet pressure fluctuations ≤ 0.5% FS (0.7-1.0MP…