CDL Doubles and Triples Practice Test Results

Question 1
71% answer correctly
Before you can supply the air tanks of a second trailer with air you need to:
Open both shut off valves
Close the shut off valve at the rear of the first trailer and open the shut off valve at the rear of the second trailer
Open the shut off valve at the rear of the first trailer and close the shut off valve at the rear of the second trailer
Close both shut off valves
Question 2
41% answer correctly
How do you test air supply to the rear trailer?
Open the emergency line shut off on the rear trailer
Open the service line shut off on the rear trailer
Pull forward slowly then apply the brakes and watch for a drop in air tank psi
Use a calibrated air pressure gauge
Question 3
83% answer correctly
You disconnect the dolly from the front trailer while it is still under the rear trailer. What will happen?
The dolly tow bar will flip up
Nothing
It will collapse
The trailers will decouple