1 . More than half of all accident-related truck driver deaths are caused by:

Rollovers.
Slippery roads.
Other drivers.
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2 . If you press the tractor air supply control and your trailer's spring brakes do not release, you should:

Inspect the air line connections.
Activate the Anti-Lock Braking System.
Turn the engine off and on again.
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3 . The trailer hand valve should be used:

To test the trailer brakes.
To check the connection between the trailer and tractor.
To accelerate.
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4 . Place the trailer air supply control in its "emergency" position to test:

The trailer emergency brakes.
A coupling device.
The anti-lock brakes.
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5 . If a trailer begins to skid, it is best for the driver to:

Release the brakes.
Accelerate.
Quickly turn the steering wheel in one direction, then in the other.
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6 . Watching the road ahead:

Is more dangerous than only watching your mirrors.
Does not help you drive more safely.
Can help you avoid the need for sudden lane changes.
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7 . If you must cross traffic while driving a combination vehicle, you should:

Assume other drivers will make room for your vehicle.
Wait for a gap large enough for your vehicle to safely cross.
Rely only on your mirrors.
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8 . The "crack-the-whip" effect can:

Turn over a trailer.
Be more effective than braking.
Make a truck move faster.
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9 . Operating combination vehicles usually requires ­­­­­____ operating single vehicles.

Less skill than
About the same level of skill as
More skill than
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10 . Keeping cargo low can:

Prevent a rollover.
Help you drive faster.
Make turns more dangerous.
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11 . What does an Anti-Lock Braking System (ABS) do?

It allows a vehicle's wheels to lock up.
It prevents a vehicle's wheels from locking up.
It makes turning a vehicle easier.
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12 . Trailers built before ____ are not required to have spring brakes.

1985
1975
1999
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13 . In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:

20 and 45 psi.
75 and 105 psi.
50 and 65 psi.
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14 . When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.

The Anti-Lock Braking System
The emergency braking system
The trailer service brakes
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15 . A trailer that is too high:

May not couple correctly.
Will couple securely.
Is not an issue.
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16 . Trailers with low underneath clearance can present challenges when driving over:

Bridges.
Railroad tracks.
Overpasses.
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17 . In an empty combination vehicle, the stiff suspension springs and strong brakes will have:

High traction.
Low traction.
No traction.
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18 . Which of the following will not help prevent a rig from rolling over?

Keeping the cargo as close to the ground as possible
Driving slowly around turns
Driving on the shoulder of a road
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19 . What is a bobtail tractor?

A tractor without a semi-trailer
A tractor with two semi-trailers
A tractor that travels faster than the speed limit
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20 . The emergency air line supplies air to the:

Relay valves.
Trailer air tanks.
Signal line.
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