A. oil injection air compressor
B. oil free compressor
C. both can
D. unable to determine
Answer: A
Analysis: Oil injection air compressors have low initial investment and are suitable for companies with limited budgets.
Answer: The main features include energy efficiency, low pressure, oil-free operation, and water lubrication, providing pure compressed air suitable for industries with high air quality requirements.
Answer: The discharge pressure range varies depending on the specific model, typically suitable for low-pressure applications such as 2-5 bar.
Answer: It alerts the operator with visual and audible warnings, and provides diagnostic information to help identify the problem.
A. 0.5-0.6 B. 0.7-0.85 C. 0.9-1.0 D. 1.1-1.2 Answer: B Analysis: When selecting the model, it needs to be multiplied by an efficiency factor of 0.7-0.85.
Answer: The advantages include no oil contamination, low maintenance costs, long service life, and high energy efficiency.