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Washington
Washington CDL Combination 1
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Q.1
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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.2
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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.3
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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.4
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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.
Q.5
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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.6
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The emergency air line supplies air to the:
Relay valves.
Trailer air tanks.
Signal line.
Q.7
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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.8
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Trailers built before ____ are not required to have spring brakes.
1985
1975
1999
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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Look into the back of the fifth wheel:
While testing your air brakes.
If your vehicle begins to skid.
When inspecting a coupling.
Q.11
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Operating combination vehicles usually requires ____ operating single vehicles.
Less skill than
About the same level of skill as
More skill than
Q.12
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If you must cross traffic while driving a combination vehicle, you should:
Assume other drivers will make room for your vehicle.
Wait for a gap large enough for your vehicle to safely cross.
Rely only on your mirrors.
Q.13
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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.14
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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.15
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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.16
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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.17
Submit
More than half of all accident-related truck driver deaths are caused by:
Rollovers.
Slippery roads.
Other drivers.
Q.18
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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.
Q.19
Submit
If you use the trailer hand brake while your trailer is skidding, it will:
Stop the skid.
Straighten the trailer.
Continue the skid.
Q.20
Submit
During a trip, the ____ should be open.
Rear service line shut-off valve
Rear supply line shut-off valve
Inner shut-off valves
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