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Washington
Washington CDL Combination 2
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Q.1
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Before a trip, you can make sure air flows to all trailers by:
Checking for moving air inside of each trailer.
Listening for air at the rear shut-off valve.
Feeling for air at the front shut-off valve.
Q.2
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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.3
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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.
Q.4
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When braking with ABS, you should:
Push the brake pedal harder than usual.
Push the brake pedal as you normally would.
Push the brake pedal more lightly than usual.
Q.5
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A driver should test the tractor protection valve by:
Pulling the yellow, diamond-shaped knob.
Releasing air with the brake pedal.
Unlocking the trailer doors.
Q.6
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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.7
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After completing a pre-trip inspection, you should ensure that the:
Service line valve is closed.
Trailer hand brake is applied.
Emergency line valve is open.
Q.8
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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.
Q.9
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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.10
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Keeping cargo centered on a rig can:
Help you drive faster.
Prevent a rollover.
Make turns more dangerous.
Q.11
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The ____ trailer is the most likely to turn over if a driver takes a turn too quickly.
Front
Last
Middle
Q.12
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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.13
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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
Q.14
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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.
Q.15
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If a trailer begins to jackknife, the driver:
Should not apply the trailer hand brake.
Should firmly apply the brakes.
Can straighten the trailer with the parking brake.
Q.16
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In an empty combination vehicle, the stiff suspension springs and strong brakes will have:
High traction.
Low traction.
No traction.
Q.17
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When you are pulling a trailer, the air supply control lever should be in its ____ position.
Emergency
Supply
Normal
Q.18
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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.19
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All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).
1943
1998
2009
Q.20
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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
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