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Combination Vehicles


When backing a tractor under a trailer you should ___________. Always use the lowest reverse gear.
After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what posistion? Normal position.
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that: The coupling is not right and should be fixed before driving the coupled unit.
Off-tracking or cheating causes which of these to follow the wider pass while making a turn? Tractor towing a 45-feet trailer.
The air lines on combination vehicles are often colored to prevent them from mixing up. The emergency line is _________ and the service line is ________. Red, Blue
The semitrailer made before 1975 that are equipped with air brakes: Often do not have spring brakes.
The air leakage rate for a combination vehicle (engine off, brakes on) should be less than _______ psi per minute. 3
You have a major leak in the service line and you put on the brakes. Service air will escape and cause the: Trailer emergency brakes to come on.
A tractor with a _______ trailer requires the shortest amount of stopping distance? Fully loaded
When you get ready to back under a semitrailer you should line up: Directly in front of the trailer.
To unlock the fifth wheel the locking lever should be placed in the ________ position. Open
The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the _______ brake line. Emergency
When coupling, the proper position of the fifth wheel is: Tilted down toward the end of the trailer.
What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports? Neutral
You have coupled with a semitrailer. Where should you put the iron trailer supports before driving away? Fully raised with the crank handle secured in its bracket.
The safety catch for the fifth wheel locking lever must be _________ for the couplimg to be complete. Over the locking lever.
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by: Applying and releasing the trailer brakes and listening for the sound of the brake.
Before you back under a trailer, make sure that: The trailer brakes are locked.
When you are uncoupling a loaded trailer you should lower the landing gear until it: Make firm contact with the ground, then crackle hits a low gear a few extra turns.
What will happen if the air lines are crossed when you hook up an old trailer? If the trailer has no spring brakes, you could drive away but you wouldn't have trailer brakes.
There are two things you can do to prevent a rollover. They are (1) keep the cargo as close to the ground as possible, and (2): Go slow around turns.
To stop a trailer skid, you should: Release the service brakes.
Why should you be sure that the fifth wheel plate is greased as required? To prevent steering problems.
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the: Emergency trailer brakes to come on.
When connecting the glad hands, press the coupler together at what degree to each other? 90 degrees.
Which of these statements is true? Bobtail tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.
Tractor with _______ trailer requires the shortest amount of stopping distance? Fully loaded.
After you have coupled the trailer you should have to raise the landing gear by using: Low gear.
You supply air to the trailer tanks by: Pushing in the trailer air supply valve.
Which part of the kingpin should the locking jaws close first? The shank.
How much space should be allowed between upper and lower fifth wheel after coupling? Nothing.
You have pushed the trailer air supply valve. You should not back a tractor under a trailer until the whole air system is: At normal pressure.
You are coupling a tractor to a semitrailer. You have connected the air lines. Before backing under the trailer you should: Supply air to the trailer system, then pull out the air supply knob.
The air leakage rate for a combination vehicle (engine off, brakes off) should be less than _______psi per minute. 3
The safest way to make turns without entering another traffic lane is: You should turn wide as you complete the turn.
The higher the center of gravity of your truck, the: Easier to turn over.
The hand valve should be used: To test the trailer brakes.
When driving a set of doubles, it is necessary to close which shut-off valve in the last trailer? Back valve.
If the service line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away? Nothing is likely to happen until you try to apply the brakes.
Created by: Honeynut718
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