CDL – Combination Vehicle Practice Test Questions And Answers
A tractor with a(n) _ trailer requires the shortest stopping distance: Fully loaded. You should not back a tractor under a trailer until the whole air system is: At normal pressure. You are coupling a tractor semitrailer of a semitrailer. You have backed up but are not under it. What should you hook up before backing under the semitrailer? The emergency and service air lines. When should you use chocks to park a trailer not equipped with spring brakes? Always. When you are uncoupling a loaded trailer, lower the landing gear until it: Makes firm contact with the ground and you lift the trailer off the fifth wheel. Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every feet of your vehicle’s length. 10.
You want to inspect the trailer support. You should place the tractor transmission in which gear after you have uncoupled the trailer? Neutral.
You are driving a combination vehicle. If the service air line comes apart but the emergency line stays together, what will happen right away? Nothing is likely to happen until you try to apply the brakes.
You are coupling a semitrailer to your tractor but have not yet backed under it. The trailer is at the right height when: It will be raised slightly when the tractor is backed under it.
You are driving a combination vehicle. The trailer breaks away and pulls apart both air lines. You would expect the trailer brakes to come on and the: Tractor protection valve to close.
“In general, the higher your truck’s “”center of gravity””, the:” Easier it is to turn over.
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. You do this by: Applying/releasing the trailer brakes and listening for brake sounds.
You have uncoupled a trailer and you want to inspect the landing gear. The tractor should be positioned: With the tractor frame under the trailer.
Which of these statements is true? “””Bobtail”” tractors can take longer to stop than a combination vehicle.”
When checking the trailer’s emergency brakes, the tractor protection control valve should be placed in the ___ position. Emergency.