Combination Vehicle Practice Test 2019

COMBINATION VEHICLE PRACTICE TEST – 02

The combination vehicle Practice 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 02

1 / 30

Before lowering your landing gear, you should check...?

That the landing gear isn't damaged

All of these things

That the ground is hard enough

That the tractor frame is under the trailer

2 / 30

If you have ABS brakes, you can expect your braking distance to be shortened by...?

20%

10%

30%

3 / 30

For your brakes to work properly, air supply must reach...?

From the tractor to the rear trailer

From the tractor to at least the first trailer

From the tractor to at least the second trailer

From the first trailer to the rear trailer

4 / 30

Before you connect hose couplers 'glad hands' you should...?

Roughen them with sandpaper

Grease them

Moisten them

Clean them

5 / 30

You should always test the trailer brakes before driving with the hand valve or by pulling the air supply control. This is particularly important on...?

Newer trucks

Older trucks

Smaller trucks

Bigger trucks

6 / 30

Having ABS brakes allows you to...?

Drive faster

Do none of these things

Drive less carefully

Follow more closely

7 / 30

You will know you have connected your hose couplers incorrectly if...?

The trailer spring brakes won't release

The brake pedal feels spongy

The engine won't start

The truck spring brakes won't release

8 / 30

If you have ABS only on your trailer and you lose steering control, you should...?

Keep the brake pressure constant

Increase the brake pressure

Pump the brakes

Release the brakes

9 / 30

If you are towing a three trailer combination, the order of the cutout cocks/shutoff valves, going from the tractor backwards, should be...?

Open – closed – open

Any of these depending on loading

Open – open – closed

Closed – open – open

10 / 30

The foot pedal on a tractor-trailer combination applies air to the service brakes...?

At all trailer wheels

At all wheels

At all tractor wheels

At the front and rear wheels

11 / 30

You should always make sure when driving that your landing gear is...?

At least 80% retracted

At least 90% retracted

At least 75% retracted

Fully retracted

12 / 30

In the coupling system, the locking jaw should be around...?

The base of the kingpin

The shank of the kingpin

The head of the kingpin

Any of these

13 / 30

If a trailer is too high when you try to couple, what might happen?

The tractor may damage the trailer

Any of these things may happen

The trailer may damage the tractor

The coupling may not engage properly

14 / 30

When checking your air brakes, it is essential that...?

At least one of the emergency or service brakes are fully functional

The emergency brakes are fully functional

The service brakes are fully functional

Both emergency and service brakes are fully functional

15 / 30

Your trailer and converter dolly will have mandatory ABS brakes if they were built after...?

1-Mar-03

1-Mar-95

1-Mar-93

1-Mar-98

16 / 30

If you have the trailer air supply knob in and the handbrake on but cannot hear air escaping from either line at the shutoff valve at the rear of the last trailer, you should first check...?

The shutoff valves

The couplings

The brake pedal

The air tanks

17 / 30

When beginning to connect a tractor to a semitrailer, you should start with the tractor positioned...?

15° to the right of the trailer

Directly in front of the trailer

15° to the left of the trailer

Any of these depending on environment

18 / 30

When you have connected the tractor and trailer, you can check the system for crossed air lines by applying the brakes and...?

Pressing the accelerator

Looking in your mirror

Asking an assistant to look

Listening

19 / 30

All air tanks in an air brake system should be drained of oil and moisture at least...?

Once every three days

Once a week

Once a month

Once a day

20 / 30

The service air line is usually colored...?

Green

Blue

Yellow

Red

21 / 30

The tractor protection valve should be checked with...?

Engine off

Spring brakes on

Engine on

Handbrake on

22 / 30

Air is supplied to the emergency supply lines by...?

Applying the handbrake

Any of these

Pushing in the trailer air supply knob

Pumping the foot brake

23 / 30

When connecting a tractor to a trailer, you should have your transmission in...?

Second gear

Neutral

First gear

Fifth gear

24 / 30

When a tractor and trailer are connected properly, there should be what space between the upper and lower fifth wheel?

None

3/8 of an inch

7/8 of an inch

1/8 of an inch

25 / 30

The sliding fifth wheel on the combination vehicle must be...?

Properly moistened

Properly oiled

Properly painted

Properly greased

26 / 30

If the fifth wheel plate is not greased as required on a tractor semitrailer combination, it could cause...?

Fuel leak problems

Tire pressure problems

Braking problems

Steering problems

27 / 30

You must remember that converter dollies and trailers were not required to have spring brakes if they were built before...?

1985

1980

1975

1970

28 / 30

The first thing to do before testing trailer service brakes is to check for...?

That tractor protection valve is out

That air pressure is reduced

Normal air pressure

Air pressure above normal

29 / 30

If you identify a damaged air or electrical line in your inspection, you should...?

Have it repaired immediately

Drive with extra caution

Inform the operator when possible

Note it on your inspection report

30 / 30

If you are not sure whether or not your trailer has ABS brakes, you can find out by...?

Testing the brakes on the road

Inspecting under the trailer

Inspecting the brake pedal

Looking for the manufacturer's plate on the back

Your score is

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