CDL Combination Vehicles Practice Test Results

Question 1
87% answer correctly
In which of the following circumstances should the valve hand be used to park a combination vehicle?
When parked on a grade
When unloading
Never
When parking for less than 10 minutes
Question 2
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 3
73% answer correctly
Why is it a good idea to lock the glad hands together when not pulling a trailer?
Saves wear on the dummy coupler
All of these are true
Maintains air tank pressure by keeping air from escaping
Keeps water and dirt out of the lines