CDL Air Brakes Practice Test Results

Question 1
50% answer correctly
Modulating control valves are used to:
Apply the spring brakes gradually
Apply the spring and air brakes together
Apply the air brakes gradually
Switch between spring and air brakes
Question 2
76% answer correctly
For air brakes, the cut-out level is:
The level at which the air compressor will start pumping air into the air storage tanks
The minimum air pressure for the air storage tanks
The average air pressure maintained in the air storage tanks
The level at which the air compressor will stop pumping air into the air storage tanks
Question 3
81% answer correctly
Air tank drains:
Deliver air from the air tanks to the air brakes
Deliver air from the air compressor to the air tanks
Allow water and oil to be expelled from air tanks
Allow excess air pressure to be released from air tanks