CDL Combination
Vehicles Test

Select the statement that best explains the "crack-the-whip" effect.

How do you supply air to the trailer tanks?

Select the situation in which you should use the hand valve to park a combination vehicle.

A tractor should not be backed under a trailer until the whole air system is:

You should have the fifth wheel plate greased as recommened because:

Make sure____when the front trailer supports are up and the trailer is sitting on the tractor.

What is a king pin?

Select the accurate statement in regards to rolling up the landing gear to complete the coupling process.

The safety catch for the fifth wheel locking lever must be ____ for a coupling to be complete.

You need to raise the landing gear just to the height of where it clears the pavement before driving.

Select the true statement in regards to if a glad hand on the blue air line is missing a seal.

You must first______to supply air to the trailer.

How should the trailer be lined up when preparing to back the tractor up?

Select the true statement in regards to crossing your air lines on a new trailer with spring brakes

Make sure that_____before you back under a trailer.

Select the reason as to why you should not use the trailer hand valve while driving.

When you have a major leak in the service line and you apply pressure to the brakes, the service air pressure will escape and:

Why should you use chocks when parking a trailer without spring brakes?

The _____of the kingpin has the locking jaw close around it.

When you have a major leak in the service line and put on the brake, the service air pressure will escape and cause the:

You should follow behind other vehicles ______when traveling under 40 mph.

Off-tracking happens when going around a corner and:

Which trailer is most likely to turn over when you make a sudden turn while pulling doubles?

After coupling with a trailer, what position should the front trailer supports be in before driving away?

There should be ___space between the upper and lower fifth wheel after coupling.

You should line up_____when getting ready to back under the trailer.

To test the security of the tractor semi trailer connection you should:

Select the step that comes first:

A tractor should not be backed under a trailer until the whole air system is:

Make sure that____when the front trailer supports are up and the trailer is resting on the tractor.

It is good practice to_____when uncoupling.

How high should you crank the landing gear?

Select the two things that are important in preventing a rollover:

How should the hand valve be used?

Select the vehicle that off-tracks the most.

Check to ensure that____when inspecting the coupling.

The purpose for the emergency air line is:

The front trailer supports should be____before driving away.

Select the true statement:

Select the load of the trailer that will require the shorter distance to stop.