CDL Combination Vehicles Test #2 | Free Practice Questions

Combination Vehicles Test #2
(english)

Combination Vehicles Test #2 (en)

1 / 20

To prevent a rollover, a driver can do two things: 1) Drive slowly when turning, and 2):

Keep the cargo as close to the ground as possible.

Drive in the middle of the road

Fill the fuel tank to the top before turning.

2 / 20

To unlock the fifth wheel, you need to move the locking lever to the ______ position.

Horizontal

Open

Locked

3 / 20

How much room should there be between the top and bottom parts of the fifth wheel after coupling?

2 inches

1/2inch

None.

4 / 20

When you have supplied air to the trailer, you should check that the air lines are not crossed and that the brakes are functioning. You can do this by:

Checking the radio for static changes.

Flipping the light switches inside the cab.

Applying and releasing the trailer brakes and listening for the sound of the brake.

5 / 20

What do glad hands usually connect?

Transmission cables for gear shifting

Hydraulic fluid lines for brake cooling.

Service and emergency air lines from the vehicle to the trailer.

6 / 20

A major leak has occurred in the service line, so you put the brakes on. The service air will escape and cause:

Transmission to fail

Trailer emergency brakes to come on.

Engine to overheat

7 / 20

The hand valve should be used:

To change the radio station.

To adjust the side mirrors.

To test the trailer brakes.

8 / 20

After connecting with a semitrailer, where should you place the iron trailer supports before you start driving?

Hanging loosely without securing the crank handle

Lowered completely touching the ground

Fully raised with the crank handle secured in its bracket.

9 / 20

Which of these vehicles will follow the wider path while turning because of off-tracking?

Tractor with two 27-feet trailers.

Tractor towing a 45-feet trailer.

53-feet bobtail.

10 / 20

What are the potential consequences when a driver mixes up the air hose connections when connecting to an old trailer?

The ABS system will fail to activate when needed.

If the trailer has no spring brakes, you could drive away but you would not have trailer brakes.

The trailer might automatically detach while driving.

11 / 20

How can you check if the connection between the tractor and the semitrailer is safe and secure?

Drive in a circle and listen for unusual noises.

Pull gently forward in low gear against the locked trailer brakes then look at it carefully.

Tap the side of the trailer with a hammer to check for sound changes.

12 / 20

What happens if you cross the air lines when hooking up to an old trailer?

The trailer will automatically disconnect from the tractor.

If the trailer has no spring brakes, you could drive away but you would not have trailer brakes.

The trailer wheels will lock up immediately when connected.

13 / 20

Air and electrical lines from the tractor to the trailer should be:

Attached with a short chain

Secured but with enough loop to turn.

Hanging loosely near the road surface

14 / 20

When the iron trailer supports are up and the trailer sits on the tractor, make sure that :

There is enough clearance between the tractor frame and the landing gear.

The air supply to the trailer is disconnected.

The trailer tires are inflated to their maximum capacity.

15 / 20

If the emergency air line in your vehicle breaks or comes apart while driving, this will make the:

Air pressure gauge to increase rapidly.

Emergency trailer brakes to come on.

Air tank to refill automatically.

16 / 20

It is common for combination vehicles to have colored air lines to prevent the lines from getting mixed up. The emergency line is _____ , the service line is _____.

Red, blue

Green, purple

Yellow, green

17 / 20

When uncoupling a full trailer, you should lower the landing gear until it:

Make firm contact with the ground, turn crank in low gear a few extra turns.

Reaches the ground.

Make contact with the ground and leave the trailer off the fifth wheel.

18 / 20

When making sure the trailer is properly coupled to the truck, the landing gears should be:

Slightly raised.

Fully raised.

Touching the ground lightly

19 / 20

In what position should you set the tractor's safety control valve when testing the emergency brakes on a trailer?

Parked

Emergency

Drive mode

20 / 20

While driving a combination vehicle, the service line disconnects, but the emergency line remains connected. What will happen immediately?

The vehicle's speed will automatically increase.

Nothing is likely to happen until you try to apply the brakes.

The steering will lock up.

Your score is

The average score is 85%

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Combination Vehicles Test #1 (english)

What is the CDL Air Brakes Test?

The CDL Combination Vehicles test is a written exam that evaluates your knowledge of safely operating combination vehicles. It covers topics specific to these types of vehicles, including:

Coupling and uncoupling trailers
Handling characteristics of combination vehicles
Inspecting combination vehicles
Safe operating practices

Who Needs to Take the CDL Combination Vehicles Test?

Anyone wanting to drive a combination vehicle needs to pass this test. This includes drivers of:

Tractor-trailers
Truck and trailer combinations
Other vehicles with a GVWR of 26,001 pounds or more, towing a trailer over 10,000 pounds

Why are Practice Tests Important?

Practicing for the CDL Combination Vehicles test is vital for success. Here’s why:

Familiarization: Practice tests get you used to the real exam’s format, question types, and time limits.
Knowledge Assessment: They help you gauge your current understanding and pinpoint areas needing more study.
Confidence Building: Seeing your progress on practice tests boosts your confidence and reduces test anxiety.
Improved Performance: Studies show that those who use practice tests do significantly better on exams.