CDL Combination Vehicles Practice Test Results

Question 1
89% answer correctly
When is the proper time to use the trailer handbrake to straighten out a trailer that`s jackknifing?
In the middle of the jackknife
Never
When you start to recover from the jackknife
As soon as you start to jackknife
Question 2
88% answer correctly
Large combination vehicles that are empty take __________ time to stop than those that are fully loaded.
Less
More
Half
The same amount of
Question 3
53% answer correctly
What function does the service line perform?
Carries air controlled by the footbrake or trailer handbrake
Distributes air throughout the cab and to each of the trailers
Marks the maximum refill point for air tanks
Supplies air to the footbrake and trailer handbrake