CDL Combination Vehicles Practice Test Results

Question 1
73% answer correctly
Where are the shut off valves?
At the front of trailers
At the back of the tractor
At the back of trailers
In the tractor cab
Question 2
73% answer correctly
What is the maximum amount of air that a combination vehicle air brake system should leak in one minute with the brakes released and the engine off?
2 psi
4 psi
3 psi
1 psi
Question 3
90% answer correctly
How would a driver supply air to trailer air tanks?
Pull out the trailer air supply valve
Push in the trailer air supply valve
Activate the air generator
Activate the service line