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Alaska
Alaska CDL Combination 1
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Q.1
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Before beginning a trip, you should:
Leave the service line valve open.
Remove the relay valves.
Close the emergency line valve.
Q.2
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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.
Q.3
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Which of the following will not help prevent a rig from rolling over?
Keeping the cargo as close to the ground as possible
Driving slowly around turns
Driving on the shoulder of a road
Q.4
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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.
Q.5
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When driving a vehicle equipped with an Anti-Lock Braking System (ABS), brakes should be applied:
In the same way as they would be in a vehicle without ABS.
As the vehicle is placed in neutral.
With the hand brake.
Q.6
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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
Q.7
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The service air line is often controlled by the foot brake and is attached to the ____ valves.
Relay
Supply
Emergency
Q.8
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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
Q.9
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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.
Q.10
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The trailer hand valve:
Should always be used for parking.
Should only be used for parking on a downgrade.
Should never be used for parking.
Q.11
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Pushing in the trailer air supply control will:
Supply the trailer with air.
Deactivate the air brakes.
Prevent the vehicle from skidding.
Q.12
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If unsure if a trailer has an Anti-Lock Braking System (ABS), you can:
Look under the trailer for wheel speed sensors coming from the back of the brakes.
Remove a tire and look for the ABS sensor on the axle.
Assume it does have ABS.
Q.13
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When coupling, after you've connected the air lines to the trailer, you should:
Supply air to the trailer.
Activate the emergency brake.
Disconnect the glad hands.
Q.14
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What does an Anti-Lock Braking System (ABS) do?
It allows a vehicle's wheels to lock up.
It prevents a vehicle's wheels from locking up.
It makes turning a vehicle easier.
Q.15
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Trailers built before ____ are not required to have spring brakes.
1985
1975
1999
Q.16
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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.
Q.17
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What is a bobtail tractor?
A tractor without a trailer
A tractor attached to two trailers
A tractor with a tank
Q.18
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When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.
The Anti-Lock Braking System
The emergency braking system
The trailer service brakes
Q.19
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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
Q.20
Submit
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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