1 . Combination vehicles:

Often have taller trailers than single commercial vehicles.
Are usually lighter than single commercial vehicles.
Require more skill to drive than single commercial vehicles.
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2 . 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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3 . 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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4 . 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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5 . 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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6 . When driving with trailers, you should:

Make quick, sudden changes.
Avoid making sudden moves.
Accelerate by pushing the accelerator to the floor.
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7 . 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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8 . When glad hands are coupled, the seals should be pressed together at a ____ angle.

50-degree
180-degree
90-degree
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9 . Trailers built before ____ are not required to have spring brakes.

1985
1975
1999
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10 . 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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11 . 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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12 . 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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13 . 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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14 . When should the trailer hand valve be used?

Only when the trailer is carrying a load
Only to test the trailer’s brakes
Only in inclement weather when the trailer may skid
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15 . The service air line is often controlled by the foot brake and is attached to the ____ valves.

Relay
Supply
Emergency
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16 . 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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17 . Rearward amplification refers to:

The amount of noise projected to the rear of a vehicle.
The cause of the "crack-the-whip" effect.
The number of trailers that can be pulled by a tractor.
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18 . 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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19 . 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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20 . 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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