1 . 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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2 . 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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3 . 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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4 . Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:

The trailer will stop normally.
The trailer will not have brakes.
The trailer will speed up.
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5 . 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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6 . 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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7 . When coupling a trailer:

Make sure to couple the proper glad hands.
Glad hands can be connected to any other glad hands.
Only one set of glad hands should be connected.
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8 . When braking while pulling a trailer equipped with anti-lock brakes, you should:

Pump the brakes.
Use extra braking force to ensure the brakes kick in.
Brake as you would without anti-lock brakes.
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9 . When backing a trailer, you must first turn the steering wheel:

In the direction you want the trailer to go.
In the direction opposite of where you want the trailer to go.
To the left.
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10 . When driving while pulling trailers, you should:

Make sudden turns with the steering wheel.
Avoid making sudden moves.
Push the accelerator to the floor when starting from a stop.
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11 . 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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12 . All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).

1943
1998
2009
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13 . When backing up while coupling a trailer, the tractor should be positioned:

Directly in front of the trailer.
Directly next to the trailer.
Parallel with the trailer.
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14 . The service air line is often controlled by the foot brake and is attached to the ____ valves.

Relay
Supply
Emergency
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15 . During a trip, landing gear should be:

Completely raised.
Completely lowered.
Skimming the pavement.
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16 . Maintain a following distance of at least ____ for every 10 feet of your vehicle if you are traveling at a speed under 40 mph.

One second
Two seconds
Three seconds
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17 . Rollovers happen when:

Drivers turn too quickly.
Drivers turn too slowly.
It is raining.
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18 . Keeping cargo low can:

Prevent a rollover.
Help you drive faster.
Make turns more dangerous.
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19 . 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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20 . If the emergency air line loses pressure:

The Anti-Lock Braking System will activate.
The service air line will activate.
The emergency brakes will activate.
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