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Driving Test
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Driving Test
Idaho
Idaho CDL Combination 2
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Q.1
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The emergency air line supplies air to the:
Relay valves.
Trailer air tanks.
Signal line.
Q.2
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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.3
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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.4
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During a trip, landing gear should be:
Completely raised.
Completely lowered.
Skimming the pavement.
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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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.7
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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.8
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Rollovers happen when:
Drivers turn too quickly.
Drivers turn too slowly.
It is raining.
Q.9
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If you are backing and the trailer begins to drift off-course, the driver should:
Return the steering wheel to the 12 o’clock position.
Turn the top of the steering wheel in the direction of the drift.
Turn the top of the steering wheel in the direction opposite of the drift.
Q.10
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Combination vehicles are usually:
Easier to drive than single commercial vehicles.
Lighter than single commercial vehicles.
More difficult to drive than single commercial vehicles.
Q.11
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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.12
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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.13
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If a load is placed on one side of a trailer, the trailer:
May lean during turns.
May add extra support during turns.
May be easier to steer during turns.
Q.14
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Combination vehicles:
Are usually shorter than single commercial vehicles.
Usually require less skill to drive than single commercial vehicles.
Usually require more skill to drive than single commercial vehicles.
Q.15
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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.16
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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.17
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A trailer that is too high:
May not couple correctly.
Will couple securely.
Is not an issue.
Q.18
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The best way to recognize that your trailer has started to skid is by:
Seeing other drivers' faces.
Checking the trailer in your mirrors.
Feeling the trailer move.
Q.19
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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.20
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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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