CDL Combination Vehicles Practice Test Results

Question 1
91% answer correctly
When backing up under a trailer you should line the tractor up:
The right side wheels of the tractor with the left side wheels of the trailer
Directly in front of the trailer
Diagonally to the left so you can see the connection area in the driver side mirror
Diagonally to the left so you can see the connection area in the passenger side mirror
Question 2
96% answer correctly
To reduce the risk of rollover when driving a combination vehicle:
Concentrate the cargo at the front and back of the rig
Keep the cargo as far away from the ground as possible
Keep the cargo as close to the ground as possible
Concentrate the cargo to one side of the rig
Question 3
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?
4 psi
1 psi
2 psi
3 psi