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?
When you start to recover from the jackknife
As soon as you start to jackknife
Never
In the middle of the jackknife
Question 2
88% answer correctly
Large combination vehicles that are empty take __________ time to stop than those that are fully loaded.
More
The same amount of
Half
Less
Question 3
90% answer correctly
How would a driver supply air to trailer air tanks?
Pull out the trailer air supply valve
Activate the service line
Push in the trailer air supply valve
Activate the air generator