1 . 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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2 . When a combination vehicle goes around a corner:

The turn should be made as tightly as possible.
The front and rear wheels move in different paths.
The rear wheels should run over the curb.
It is acceptable for street signs to be knocked over if they are too close to the road.
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3 . When coupling:

You can assume all vehicles are the same.
Be sure that you are coupling correctly.
Cracks in the mounting are acceptable.
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4 . When traveling more slowly than 40 mph, maintain at least ____ of following distance per every 10 feet of your vehicle.

One second
Two seconds
Three seconds
Four seconds
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5 . Trailers with low underneath clearance may be difficult to drive:

On interstate highways.
Over railroad crossings.
On dirt roads.
At the posted speed limit.
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6 . If the trailer begins to skid, it is best to:

Release the brakes.
Accelerate.
Quickly turn the steering wheel one way, then the other.
Brake.
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7 . The best way to notice if a trailer has begun to skid is to:

Ask another driver.
Use your mirrors to determine if the trailer has left the lane.
Look at the skid sensor.
Feel the tractor move.
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8 . In an empty combination vehicle, the stiff suspension springs and strong brakes will have:

High traction.
Low traction.
No traction.
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9 . When backing a trailer, how should you turn the steering wheel?

Turn the top of the steering wheel in the direction you want the trailer to go.
Turn the top of the steering wheel in the direction opposite of where you want the trailer to go.
It doesn’t matter.
It depends on where the trailer is being backed.
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10 . Pushing in the trailer air supply control will:

Supply the trailer with air.
Deactivate the air brakes.
Prevent the vehicle from skidding.
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11 . ____ are the cause of more than half of all accident-related truck driver deaths.

Truck rollovers
Motorcycles
Slippery roads
Pedestrians
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12 . If you need to back your trailer but cannot back up in a straight path, you should:

Back toward the passenger's side.
Back toward the driver's side.
Swerve back and forth while backing.
Always turn to your right.
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13 . If a parked trailer does not have spring brakes, you should keep the trailer from moving by:

Having the vehicle parked against a wall or other vehicle.
Using chock blocks.
Parking on a slight incline.
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14 . After connecting the air lines to the trailer while coupling, you should:

Supply air to the trailer.
Chock the wheels.
Inspect the fifth wheel.
Connect the electrical cord.
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15 . Pull out the trailer air supply control to test:

The parking brake.
The trailer emergency brakes.
The trailer service brakes.
The landing gear.
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16 . After finishing a pre-trip inspection, you should:

Close the service line valve.
Remove the service line valve.
Leave the emergency line valve open.
Leave the rear shut-off valves open.
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17 . A shut-off valve:

Is located on the front of a trailer.
Is located on the instrument panel.
Prevents air from escaping an air brake system.
Should always be open.
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18 . When entering or crossing traffic while driving a combination vehicle, it is especially important that you:

Sound your horn.
Make sure there is a large enough gap for your vehicle.
Expect other drivers to make room for your vehicle.
Let other drivers wave you into their lane.
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19 . The service air line is often controlled by the foot brake and is attached to the ____ valves.

Relay
Supply
Emergency
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20 . The best way to recognize that your trailer has started to skid is by:

Seeing other drivers' faces.
Checking the trailer in your mirrors.
Feeling the trailer move.
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