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

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

It makes no difference

In a straight line

Curving to the left

Curving to the right

2 / 30

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

Seeing it in your mirrors

Being warned by other road users

Hearing the tires squeal

Feeling it through the steering wheel

3 / 30

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

Swing wide at the beginning

Any of these

Swing wide on exit

Swing wide half way through

4 / 30

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

Accelerate

Apply the handbrake

Increase foot brake pressure

Release the foot brake

5 / 30

The emergency air line is usually colored what?

Red

Green

Blue

Yellow

6 / 30

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

Wedge the foot brake down when parked

Always park facing uphill

Always use chocks under the wheels when parked

Always park facing a wall or other solid object

7 / 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?

3.5 times

1.5 times

4.5 times

2.5 times

8 / 30

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

45 – 65 psi

30 – 55 psi

20 – 45 psi

15 – 30 psi

9 / 30

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

A tractor and triple trailer

A tractor and double trailer

A car mover

A single tractor and trailer

10 / 30

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

Call your employer

Call a tow truck

Call the railroad company

Call 911

11 / 30

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

Accelerate

Leave the highway

Pull into a parking lot

Brake hard

12 / 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

5 feet of vehicle length

7.5 feet of vehicle length

10 feet of vehicle length

13 / 30

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

Making high-speed stops

Make emergency stops

Testing the brakes

Making slow speed stops

14 / 30

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

Half loaded

Fully loaded

Empty

Three quarters loaded

15 / 30

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

Follow a tighter line than your tractor

Do any of these depending on road conditions

Follow the same line as your tractor

Follow a wider line than your tractor

16 / 30

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

Having to stop for you

Getting too close to your rear bumper

Passing you on the left

Passing you on the right

17 / 30

The most frequent cause of rollover is...?

Turning too fast

Turning too slowly

Turning at too shallow an angle

Turning at too sharp an angle

18 / 30

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

The truck loses all braking power

The trailer loses all braking power

The trailer emergency brakes apply

The truck emergency brakes apply

19 / 30

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

10 times

15 times

2 times

5 times

20 / 30

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

30% plus

50% plus

20% plus

40% plus

21 / 30

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

Evacuate the vehicle

Stay in the vehicle

Ask others to tow your vehicle

Stay by the vehicle

22 / 30

Before reversing a trailer, you should...?

Walk all around the vehicle

Sound your horn several times

Rev your engine loudly

Shout a warning

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

So it is set straight ahead

Opposite the direction you want to go

24 / 30

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

They are 50% loaded

They are empty

They are 75% loaded

They are fully loaded

25 / 30

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

Green

Blue

Red

Yellow

26 / 30

The service air line is controlled by...?

The trailer handbrake only

The foot brake or the trailer handbrake

The trailer air supply control

The foot brake only

27 / 30

Which of these will help to prevent rollover?

Keeping the cargo as low as possible

Keeping the cargo as high as possible

Keeping the cargo as far to the back as possible

Keeping the cargo as far to the front as possible

28 / 30

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

30 mph

60 mph

50 mph

40 mph

29 / 30

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

Smooth and swift

Gentle and smooth

Firm and slow

Harsh and swift

30 / 30

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

The tractor breaks away from the trailer

The tractor/trailer air hose is severed

The air system develops a bad leak

Any of these things happen

Your score is

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