Do you currently have car insurance? Yes I have insurance. Great, you're all set! Click here if you still want to compare rates. No, I need insurance and I want to compare options. Before you start the test, please answer the following question regarding your insurance status. Without insurance you will not be able to drive in California Question Which part of the truck is the air compressor connected to? Answers The transmission The engine The radiator The door latch Explanation In an air brake system, the air compressor is connected to the engine through gears or a v-belt. Take a FREE Practice Test Now This questions appears in the following tests: North Dakota Knowledge Test Class A , West Virginia Knowledge Test Class A , District Of Columbia Knowledge Test Class B , Mississippi Air Brakes , Wyoming Air Brakes ,