Combination

Question 1

The “crack-the-whip” effect can:

Answer 1

Turn over a trailer.

Question 2

To help prevent rollovers, you should:

Answer 2

Drive slowly around turns.

Question 3

Large combination vehicles take the longest amount of time to stop:

Answer 3

When empty.

Question 4

What is off-tracking?

Answer 4

When a vehicle’s front wheels follow a different path than its rear wheels

Question 5

When backing a trailer, how should you turn the steering wheel?

Answer 5

Turn the top of the steering wheel in the direction opposite of where you want the trailer
to go.

Question 6

What does the trailer air supply control look like?

Answer 6

It is an eight-sided red knob.

Question 7

Air pressure in the ____ air line is controlled by either the foot brake or trailer hand brake.

Answer 7

Service

Question 8

One function of the emergency air line is to:

Answer 8

Control the emergency brakes.

Question 9

Having ABS on only one axle:

Answer 9

Will allow the driver additional control over their vehicle when braking.

Question 10

If a trailer begins to skid, the driver should:

Answer 10

Release the brakes.

Question 11

The trailer hand valve should:

Answer 11

Be used only to test the trailer brakes.

Question 12

All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).

Answer 12

1998

Question 13

When a combination vehicle goes around a corner:

Answer 13

The front and rear wheels move in different paths.

Question 14

If a parked trailer does not have spring brakes, you should keep the trailer from moving by:

Answer 14

Using wheel chocks.

Question 15

Trailers with low underneath clearance may be difficult to drive:

Answer 15

Over railroad crossings.

Question 16

A shut-off valve:

Answer 16

Prevents air from escaping an air brake system.

Question 17

If a trailer is too high:

Answer 17

It may not couple correctly.

Question 18

After coupling, there should be ____ between the upper and lower fifth wheel.

Answer 18

No space

Question 19

When uncoupling a trailer, landing gear should be:

Answer 19

Firmly on the ground.

Question 20

Before a drive, ensure that air flows to all trailers by:

Answer 20

Opening the rear shut-off valves and listening for escaping air.

Question 21

Test the tractor protection valve by:

Answer 21

Releasing air with the brake pedal.

Question 22

Pull out the trailer air supply control to test:

Answer 22

The trailer emergency brakes.

Question 23

To prevent a rollover, a driver should:

Answer 23

Keep cargo low.

Question 24

One way to prevent a rollover is to:

Answer 24

Keep cargo centered on the rig.

Question 25

In a sudden turn, the ____ trailer is the most likely to turn over.

Answer 25

Last

Question 26

Using the trailer hand brake while experiencing a trailer jackknife will:

Answer 26

Continue the skid.

Question 27

If you need to back your trailer but cannot back up in a straight path, you should:

Answer 27

Back toward the driver's side.

Question 28

Using the trailer hand valve while driving:

Answer 28

Can cause a skid.

Question 29

Push in the trailer air supply control to:

Answer 29

Supply the trailer with air.

Question 30

In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:

Answer 30

Air pressure drops to a level between 20 and 45 psi.

Question 31

An air supply control in its "emergency" position will:

Answer 31

Apply the trailer emergency brakes.

Question 32

The service air line is attached to the:

Answer 32

Relay valves.

Question 33

The emergency air line:

Answer 33

Supplies air to the trailer air tanks.

Question 34

Trailers built before 1975 are:

Answer 34

Not required to have spring brakes.

Question 35

While inspecting a coupling, you should go under the trailer and:

Answer 35

Look into the back of the fifth wheel.

Question 36

``` If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can: ```

Answer 36

Check for wheel speed sensors coming from the back of the brakes.

Question 37

After finishing a pre-trip inspection, you should:

Answer 37

Close the emergency line valve.

Question 38

After finishing a pre-trip inspection, you should:

Answer 38

Close the service line valve.

Question 39

During a trip, which shut-off valves should be open?

Answer 39

All shut-off valves should be in the open position, except the rear shut-off valves.

Question 40

To test the trailer service brakes, you should:

Answer 40

Move the vehicle forward slowly and apply the brakes with the hand control.

Question 41

____ are the cause of more than half of all accident-related truck driver deaths.

Answer 41

Truck rollovers

Question 42

When traveling more slowly than 40 mph, maintain at least ____ of following distance per every 10 feet of your vehicle.

Answer 42

One second

Question 43

Avoid needing to make sudden lane changes by:

Answer 43

Watching the road ahead while driving.

Question 44

A lightly-loaded combination vehicle will stop more slowly than a fully-loaded vehicle because:

Answer 44

The stiff suspension springs and strong brakes will have low traction.

Question 45

When driving a bobtail tractor, you should be aware that:

Answer 45

Bobtails are more difficult to stop than tractors with semitrailers.

Question 46

Compared to other commercial motor vehicles, combination vehicles need more space on the road because they are longer and they:

Answer 46

Need more space to turn and stop.

Question 47

When entering or crossing traffic while driving a combination vehicle, it is especially important that you:

Answer 47

Make sure there is a large enough gap for your vehicle.

Question 48

An air supply control lever should be in its "normal" position when you are:

Answer 48

Pulling a trailer.

Question 49

When glad hands are coupled, the seals should be pressed together at an angle of:

Answer 49

90 degrees.

Question 50

In a double or triple combination:

Answer 50

The heaviest trailer should be positioned directly behind the cab.