1 . Avoid needing to make sudden lane changes by:

Using your horn to encourage other drivers to move out of your lane.
Only driving slower than the posted speed limit.
Watching the road ahead while driving.
Pulling off the road and waiting when there is high traffic.
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2 . To prevent a rollover, cargo should be:

Loaded with most weight on the driver’s side of the trailer.
Placed near the rear of the trailer.
Spread out in the trailer.
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3 . What is a bobtail tractor?

A tractor without a trailer
A tractor attached to two trailers
A tractor with a tank
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4 . What is the Johnson bar?

A hand valve that works the trailer brakes
A valve that indicates the fuel level
A valve that limits the amount of cargo
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5 . What is another name for the service line?

The signal line
The cable line
The surplus line
The power line
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6 . If an air supply control is in its "emergency" position:

The vehicle will increase speed.
The trailer emergency brakes will be applied.
The air supply to the trailer will increase.
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7 . If a trailer begins to jackknife, the driver:

Should not apply the trailer hand brake.
Should firmly apply the brakes.
Can straighten the trailer with the parking brake.
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8 . If a load is placed on one side of a trailer, the trailer:

May lean during turns.
May add extra support during turns.
May be easier to steer during turns.
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9 . When braking with ABS, you should:

Push the brake pedal harder than usual.
Push the brake pedal as you normally would.
Push the brake pedal more lightly than usual.
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10 . Before a drive, ensure that air flows to all trailers by:

Opening the rear shut-off valves and listening for escaping air.
Closing the rear shut-off valves and listening for escaping air.
Disconnecting air supply lines and listening for escaping air.
Rolling each trailer down a hill and testing the brakes.
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11 . Trailers with low underneath clearance can present challenges when driving over:

Bridges.
Railroad tracks.
Overpasses.
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12 . 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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13 . In a sudden turn, the ____ trailer is the most likely to turn over.

Front
Last
Middle
First
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14 . When coupling, you should:

Make sure to couple the proper glad hands.
Only couple one set of glad hands.
It is best to leave one glad hand loose.
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15 . What is another name for the service line?

The control line
The utility line
The open line
The parallel line
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16 . 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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17 . The emergency air line supplies air to the:

Relay valves.
Trailer air tanks.
Signal line.
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18 . In an empty combination vehicle, the stiff suspension springs and strong brakes will have:

High traction.
Low traction.
No traction.
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19 . A combination vehicle has:

One air line.
Two air lines.
Three air lines.
Four air lines.
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20 . 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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21 . Combination vehicles need extra space on the road because they:

Drive more slowly than other commercial motor vehicles.
Are heavier than other commercial motor vehicles.
Need more space to turn and stop than other commercial motor vehicles.
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22 . When coupling a trailer, you should:

Couple together the proper glad hands.
Couple glad hands with any other glad hands.
Leave one pair of glad hand loose.
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23 . The service air line is attached to the:

Relay valves.
Supply line.
Emergency air line.
Steering wheel.
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24 . When glad hands are coupled, the seals should be pressed together at an angle of:

30 degrees.
45 degrees.
60 degrees.
90 degrees.
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25 . A driver should test the tractor protection valve by:

Pulling the yellow, diamond-shaped knob.
Releasing air with the brake pedal.
Unlocking the trailer doors.
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26 . Glad hands are:

Coupling devices.
Happy passengers.
Eager mechanics.
Pleased drivers.
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27 . What can the “crack-the-whip” effect do?

Turn over trailers.
Make loud noises.
Make trucks accelerate.
Make trucks decelerate.
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28 . 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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29 . What does the trailer air supply control look like?

It is a square blue knob.
It is a triangular yellow knob.
It is an eight-sided red knob.
It is a circular orange knob.
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30 . After finishing a pre-trip inspection, you should:

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