1 . A tractor protection valve:

Keeps air in a brake system if there is a bad leak.
Prevents a truck from being stolen.
Prevents a trailer from being accidentally released.
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2 . In a double or triple combination, the ____ trailer should be directly behind the cab.

Lightest
Heaviest
Smallest
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3 . How much space should be between the upper and lower fifth wheel?

About five inches of space
A maximum of two inches of space
No space
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4 . 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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5 . Shut-off valves:

Prevent air from escaping air brake systems.
Prevent air from entering air brake systems.
Override vehicles that are out of control.
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6 . If the emergency air line loses pressure:

The service brakes will activate.
The tractor protection valve will close.
The rear trailer will detach from the combination.
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7 . If color-coded, which color is used to identify service lines?

White
Yellow
Blue
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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 connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.

Level with
Slightly higher than
Slightly lower than
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10 . Rearward amplification refers to:

The amount of noise projected to the rear of the vehicle.
The cause of the "crack-the-whip" effect.
The number of trailers that can be pulled by one tractor.
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11 . The tractor protection valve:

Ensures that oil adequately lubricates the engine.
Protects the tractor from exceeding a set speed.
Keeps air in the truck braking system if the trailer develops a leak.
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12 . The trailer hand valve should not be used while you are driving because:

It will disconnect from the vehicle.
You will stop the vehicle too quickly.
It can cause a skid.
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13 . Combination vehicles are usually:

Easier to drive than single commercial vehicles.
Lighter than single commercial vehicles.
More difficult to drive than single commercial vehicles.
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14 . When glad hands are coupled, the seals should be pressed together at a ____ angle.

50-degree
180-degree
90-degree
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15 . The ____ trailer is the most likely to turn over if a driver takes a turn too quickly.

Front
Last
Middle
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16 . 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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17 . Combination vehicles:

Are usually shorter than single commercial vehicles.
Usually require less skill to drive than single commercial vehicles.
Usually require more skill to drive than single commercial vehicles.
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18 . 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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19 . When a combination vehicle goes around a corner:

The vehicle must use at least two lanes.
The front and rear wheels will move in different paths.
It is best to allow the rear wheels to drive over the curb.
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20 . Before beginning a trip, you should:

Leave the service line valve open.
Remove the relay valves.
Close the emergency line valve.
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