Free Combination CDL Test 2019

COMBINATION CDL TEST – 01

The combination CDL test will examine your knowledge of driving combinations, combination vehicle air brakes, antilock brake systems, coupling and uncoupling, and inspecting combinations. In order to receive your combination vehicle endorsement, it is required that you pass the state’s official CDL written Knowledge exam.

Combination Test 01

1 / 30

On newer vehicles, the trailer air supply control will be a knob of which color?

Red

Yellow

Blue

Green

2 / 30

The earliest and best way to learn that your trailer has started to skid is...?

Feeling it through the steering wheel

Seeing it in your mirrors

Being warned by other road users

Hearing the tires squeal

3 / 30

The tractor protection valve will be activated if air pressure falls below...?

30 – 55 psi

15 – 30 psi

45 – 65 psi

20 – 45 psi

4 / 30

The service air line is controlled by...?

The trailer air supply control

The trailer handbrake only

The foot brake only

The foot brake or the trailer handbrake

5 / 30

The tractor protection valve keeps air in the tractor or truck brake system if...?

The air system develops a bad leak

The tractor breaks away from the trailer

Any of these things happen

The tractor/trailer air hose is severed

6 / 30

When air is let out of the trailer emergency line, what happens?

The trailer emergency brakes apply

The truck loses all braking power

The trailer loses all braking power

The truck emergency brakes apply

7 / 30

Ideally, when you have to back up a trailer, you should position your vehicle so you come back...?

In a straight line

It makes no difference

Curving to the left

Curving to the right

8 / 30

Your following distance to other vehicles when driving with a trailer should be at least one second for every...?

15 feet of vehicle length

10 feet of vehicle length

5 feet of vehicle length

7.5 feet of vehicle length

9 / 30

Which of these is one of the first things you should do if your vehicle becomes stuck on a railroad crossing?

Call a tow truck

Call your employer

Call 911

Call the railroad company

10 / 30

Which of these vehicles is most likely to get stuck on a railroad crossing?

A car mover

A tractor and double trailer

A single tractor and trailer

A tractor and triple trailer

11 / 30

You should add at least an extra second to your following distance to other vehicles if you are traveling in excess of...?

60 mph

40 mph

50 mph

30 mph

12 / 30

To regain control of a trailer which is jackknifing, you should...?

Increase foot brake pressure

Apply the handbrake

Release the foot brake

Accelerate

13 / 30

The emergency air line is usually colored what?

Blue

Red

Green

Yellow

14 / 30

A rig with triple 27 foot trailers is how much more likely to roll in a crash than a five axle tractor semitrailer of 45 feet?

2.5 times

1.5 times

4.5 times

3.5 times

15 / 30

If your vehicle gets stuck on a railroad crossing, what should you do?

Ask others to tow your vehicle

Evacuate the vehicle

Stay in the vehicle

Stay by the vehicle

16 / 30

The most frequent cause of rollover is...?

Turning too slowly

Turning at too sharp an angle

Turning too fast

Turning at too shallow an angle

17 / 30

Truck rollovers are responsible for what percentage of driver deaths in truck crashes?

40% plus

30% plus

20% plus

50% plus

18 / 30

Jackknifing is more likely to happen when a trailer is...?

Fully loaded

Half loaded

Three quarters loaded

Empty

19 / 30

Which of these will help to prevent rollover?

Keeping the cargo as high as possible

Keeping the cargo as low as possible

Keeping the cargo as far to the back as possible

Keeping the cargo as far to the front as possible

20 / 30

If you are using a trailer which does not have spring brakes, you should...?

Wedge the foot brake down when parked

Always use chocks under the wheels when parked

Always park facing a wall or other solid object

Always park facing uphill

21 / 30

How much more likely is a truck to roll over if it is fully loaded, compared to an empty rig?

2 times

15 times

5 times

10 times

22 / 30

When pulling a trailer, you should aim to make your steering...?

Gentle and smooth

Firm and slow

Smooth and swift

Harsh and swift

23 / 30

When backing up with a trailer, you should start the maneuver by turning the steering wheel...?

In the direction you want to go

Any of these depending on length of trailer

Opposite the direction you want to go

So it is set straight ahead

24 / 30

You have to make a right turn that can only be completed by using another traffic lane. You should...?

Any of these

Swing wide on exit

Swing wide half way through

Swing wide at the beginning

25 / 30

Before reversing a trailer, you should...?

Walk all around the vehicle

Shout a warning

Rev your engine loudly

Sound your horn several times

26 / 30

In a vehicle with air brakes, the trailer hand valve should only be used for...?

Making slow speed stops

Make emergency stops

Making high-speed stops

Testing the brakes

27 / 30

Large combination vehicles take longer to stop when...?

They are empty

They are 50% loaded

They are 75% loaded

They are fully loaded

28 / 30

When making a right-hand turn, you should aim to stop other drivers...?

Passing you on the left

Having to stop for you

Getting too close to your rear bumper

Passing you on the right

29 / 30

You should check in your mirrors to see if your trailer is in the correct position every time you...?

Leave the highway

Accelerate

Brake hard

Pull into a parking lot

30 / 30

The longer your trailer is, the more the path of your rear wheels will...?

Do any of these depending on road conditions

Follow a wider line than your tractor

Follow a tighter line than your tractor

Follow the same line as your tractor

Your score is

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