Engine 2014: General Subjects

1. A self-contained recovery devices can only be used on large CFC and HCFC units
2. B self-contained recovery devices usually contain a compressor, system- dependent recovery devices do not
3. C the system compressor must be working to use system dependent devices, the system compressor may or may not be  operational when self-contained devices are used
4. D there is no difference between the devices

Tip: press A-D to answer