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?
Use a calibrated air pressure gauge
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
Question 3
43% answer correctly
If you must drive through standing or flowing water, which of the following should you not do?
Increase the engine RPM
Drive through quickly
Use a lower gear
Stop in the middle