Free Combination Vehicles Practice Test 1 designed to help you pass the written exam with ease

By Tommy on Tuesday, November 17th, 2009 | 1 Comment

To better help you pass the Combination Vehicles section of the CDL exam, I have added a few pod cast. The pod cast that will help you prepare for the Combination Vehicles practice exam are here; CDL 101 Weekly – Episode #20, CDL 101 Weekly – Episode #21, CDL 101 Weekly – Episode #22 and CDL 101 Weekly – Episode #23.

Combination Vehicles Practice Test 1

Taking the CDL written exam can be stressful, feel free to practice on our free practice exam. This practice exam has been put together by a former CDL instructor and hits all the right points. You can even choose to e-mail yourself the results if you so desire. This practice test will help you prepare for the Combination Vehicles test when testing for your CDL. Good luck.

Combination vehicles are usually heavier, longer and require more driving skill than single commercial vehicles.

True

False

Rearward amplification causes the crack-the-whip effect.

True

False

Large combination vehicles take longer to stop when they are empty than when they are fully loaded.

True

False

It takes bobtails longer to
stop than a tractor-semi trailer loaded to maximum
gross weight.

True

False

When the wheels of a trailer lock up, the trailer will tend to swing around.

True

False

Trailer lock up is less likely to happen when the trailer is empty or lightly loaded.

True

False

When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels.

True

False

When you back a trailer, you should position your vehicle so you can back in a curved path to the driver’s side.

True

False

Use the trailer hand brake (if
you have one) to straighten out a trailer skid.

True

False

The trailer hand valve should be used only to test the trailer brakes.

True

False

The tractor protection valve keeps air in the tractor or truck brake system should the trailer break away or develop a bad leak.

True

False

When the tractor protection
valve closes, it stops any air from going out of the tractor.

True

False

Every combination vehicle has two air lines, the service line and the emergency line.

True

False

The emergency line carries air, which is controlled by the foot brake or the trailer hand brake.

True

False

The emergency line controls the emergency brakes on combination vehicles.

True

False

Emergency lines are often coded with the color blue to keep from
getting them mixed up with the blue service line.

True

False

If you cross the air lines, supply air will be sent to the service line instead of going to charge the trailer air tanks.

True

False

The pressure in the service line is controlled by the brake pedal (and the trailer hand brake).

True

False

Shut-off valves (also called cut-out cocks) are used in the service and supply air lines at the back of trailers used to tow other trailers.

True

False

You may not notice a major leak in the service line until you try to put the brakes on. Then, the air loss from the leak will lower the air tank pressure quickly. If it goes low enough, the trailer emergency brakes will come on.

True

False