1 . 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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2 . When a vehicle goes around a corner, the rear wheels:

Follow the same path as the front wheels.
Follow a different path than the front wheels.
Should not be a concern to the driver.
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3 . A loss of air pressure in the emergency line will cause:

The service brakes to activate.
The tractor protection valve to close.
The rear trailer to detach from the combination.
The suspension springs to extend.
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4 . To control surge when stopping, you should not:

Keep a steady pressure on the brakes.
Brake well in advance of a stop.
Release the brakes too quickly.
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5 . 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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6 . Fully-loaded rigs:

Are less likely to roll over than empty rigs.
Are more likely to roll over than empty rigs.
Are just as likely to roll over as empty rigs.
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7 . 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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8 . 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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9 . To lower the risk of a rollover, you should:

Load the cargo as far forward as possible.
Load the cargo as far back as possible.
Load the cargo as low as possible.
Stack the cargo as high as possible.
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10 . 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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11 . Fully-loaded rigs:

Usually are very responsive to steering.
Are more likely to roll over than empty rigs.
Can stop quickly.
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12 . 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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13 . 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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14 . 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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15 . A tractor protection valve is:

A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.
A device that prevents theft.
A device that controls fuel levels.
A device that allows the battery to recharge efficiently.
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16 . An Anti-Lock Braking System (ABS):

Allows wheels to lock up.
Prevents wheels from locking up.
Makes it easier to turn a large vehicle.
Assists with the operation of brake lights.
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17 . If you use the trailer hand brake while your trailer is skidding, it will:

Stop the skid.
Straighten the trailer.
Continue the skid.
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18 . If a trailer is too high:

It will not make a difference when coupling.
It may not couple correctly.
Coupling will be more secure.
Coupling will be easier.
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19 . If a parked trailer does not have spring brakes, you should keep the trailer from moving by:

Using the air brakes.
Using wheel chocks.
Parking near a wall.
Parking on a slight incline.
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20 . Test the tractor protection valve by:

Removing the air supply knob.
Removing the parking brake control knob.
Releasing air with the brake pedal.
Releasing air with the gas pedal.
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