CDL Combination Test Flashcards

CDL Combination Test Flashcards Under good driving conditions, you should leave at least one second of space between your vehicle and the ahead for every ___ feet of your vehicle's length.10

You should crank the landing gear until: It is as far up as it will go

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 brake sounds; and also by lifting the brake pedal In normal driving, some drivers use the hand valve before applying the brake pedal to prevent a jackknife. Which of these statements is true?It should not be done If you cross air lines on a new trailer with spring brakes:You won't be able to release the trailer brakes When connecting the glad hands press the two seals with the couplers together at what degree to each other?90 degrees How much space should there be between the upper and lower fifth wheel after coupling?none If you cannot make a turn without entering another lane,

you should:

Turn wide before you start your turn The front trailer supports are up and the trailer is resting on

the tractor. Make sure:

There is enough clearance between the tractor frame and the landing gear and that there is enough clearance between the tops of the tractor tires and the nose of the trailer The safest way to turn without entering another traffic lane

is:

You should turn wide as you complete the turn The tractor protection valve will close and the trailer emergency brakes will come on when there is a major break leak in the ___ brake line.Emergency

The earliest way to notice a trailer skid is: By seeing it in your mirrors

After you lock the kingpin into the fifth wheel, you should

check the connection by:

Pulling the tractor ahead gently with trailer brakes locked Which of the following steps comes first? Connect the air supply lines Off-tracking or cheating causes which of these to follow the wider path while making a turn?Tractor towing a 45 feet trailer Emergency controlled braking is when you: Apply the brakes as hard as you can without locking the wheels When coupling the glad hands, you should NOT do the

following:

Cross air supply lines to test them for leaks After you connect the air lines, but before you back under

the trailer, you should:

Supply air to the trailer system, then pull out the air supply knob In order to supply air to the trailer, you must first:Stop engine so you can hear the brakes When coupling the trailer, back up slowly until: The fifth wheel touches the trailer

The trailer should be lowered so that:It's raised slightly when the tractor's backed under it Air and electrical lines from the tractor to the trailer should

be:

Secured but with enough to loop the turn When should you use the hand valve to park a combination vehicle?Never

You supply air to the trailer tanks by:Pushing the trailer air supply valve

The driver crosses the air lines when hooking up to an old trailer. What will happen?If the trailer has no spring brakes, you can drive away, but you will not have trailer brakes You are uncoupling a trailer. After you shut off the trailer air

supply and lock the trailer brakes, you should:

Back up gently to ease pressure on the fifth wheel locking jaws

Th trailer air supply control:Is a red, eight sided knob

You have pushed in the trailer supply valve. You should not

move the tractor until the whole air system is:

At normal pressure

Before you begin coupling:Check your path for hazards

The semitrailer made before 1975 that are equipped with

the air brakes:

Often do not have spring brakes After you have coupled the trailer you should raise the

landing gear by using:

Low gear What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports?Neutral "Off-tracking" occurs when you go around a corner and:The rear wheels follow a different path than the front wheels

A king pin is:A pin which locks the trailer to the tractor on the fifth wheel

When you get ready to back under the semi-trailer you should line up Directly in front of the trailer You are coupling a tractor to a semi-trailer and have backed up but are not under it. What should you hook up before backing under?The emergency and service air lines Which part of the kingpin should the locking jaws close around The shank When uncoupling, if you park the trailer at an angle...You could do damage to the landing gear When you inspect the coupling, check to ensure that:There's a little slack in the air lines How should you test the tractor semitrailer connection for security?Pull gently forward against the locked trailer brakes then look at it carefully

You can damage the landing gear if you:Back under the trailer at an angle

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 There are two things that a driver can do to prevent a roll

over. They are: (1) keep the cargo as close to the ground

as possible; and (2):

Go slowly around turns When backing a tractor under a trailer you should:Always use the lowest reverse gear You should not back a tractor under a trailer until the whole

air system is:

At normal pressure

A device which connects the service and emergency air lines from the truck to the trailer is called..Glad hands

If you start a trailer skid you should:Release the brakes to get traction back

You are coupling a semi-trailer to your tractor but have not

yet backed under. The trailer is at the right height when:

It will be raised slightly when the tractor is backed under it 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 You have coupled with a semi-trailer. In what position should you put the front trailer supports before driving away?Fully raised with the crank handle secured in its bracket Why should you lock the tractor glad hands (or dummy couplers) to each other when they are not towing a trailer?It will keep dirt and water out of the lines The safety catch for the fifth wheel locking level must be ______ for a coupling to be complete.Over the locking lever

Large combination vehicles take longer to stop: When they are empty

The air leakage rate for a combination vehicle (engine off, brakes off) should be no more than _____ psi per minute.3 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 vehicle

Before you back under a trailer, make sure the: Trailer brakes are locked

Why should you be sure that the fifth wheel plate is greased as required?To prevent steering problems Where should the tractor be when you inspect landing gear after uncoupling the trailer?Completely cleared from the trailer If one of the glad hands on your blue air line is missing a

seal:

You might end up with a service line air leak When checking the trailer emergency brakes, the tractor protection control valve should be placed in what position?Emergency The trailer air supply control (also called the tractor prevention valve control) should automatically close when the air pressure fails to, between ____ psi 20 and 45 When uncoupling, it's generally good practice to: Couple the glad hands together; Couple the glad hands to dummy couplers; Hag the electrical cable with the plug end down The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than _______ psi per minute 4 When coupling, the proper position of the fifth wheel is:Tilted down towards the end of the tractor Compared to a straight truck or bus there are ____ things to inspect in combination vehicles.More Which of these statements is true?"Bobtail" tractors can take longer to stop than a combination vehicle loaded to the maximum gross weight Which one of the following is controlled by the foot brake?The service air line If the service air 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