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:
Close both shut off valves
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
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
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
Use a calibrated air pressure gauge
Pull forward slowly then apply the brakes and watch for a drop in air tank psi
Open the service line shut off on the rear trailer
Question 3
43% answer correctly
If you must drive through standing or flowing water, which of the following should you not do?
Drive through quickly
Increase the engine RPM
Stop in the middle
Use a lower gear