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Driving Test
Vermont
Vermont CDL Combination 1
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Q.1
Submit
What is the tractor protection valve?
A valve that keeps air in the brake system should a bad leak occur
A valve that prevents the trailer from being accidentally released
A valve that prevents the vehicle from going too fast
Q.2
Submit
Bobtail tractors are ____ to stop than tractors attached to full semitrailers.
Quicker
Easier
More difficult
Q.3
Submit
If color-coded, which color is used to identify service lines?
White
Yellow
Blue
Q.4
Submit
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
Submit
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.6
Submit
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.7
Submit
A trolley valve:
Should be used while driving.
Should only be used to test trailer brakes.
Should be used when parking uphill.
Q.8
Submit
The service air line is often controlled by the foot brake and is attached to the ____ valves.
Relay
Supply
Emergency
Q.9
Submit
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.10
Submit
In an empty combination vehicle, the stiff suspension springs and strong brakes will have:
High traction.
Low traction.
No traction.
Q.11
Submit
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.12
Submit
What is a tractor protection valve?
A valve to keep air in the brake system should there be a bad leak
A valve that prevents a truck from being stolen
A valve that prevents the driver from driving too fast
Q.13
Submit
When you are pulling a trailer, the air supply control lever should be in its ____ position.
Emergency
Supply
Normal
Q.14
Submit
When backing a trailer, you must turn the steering wheel:
In the direction you want the trailer to move.
In the direction opposite of where you want the trailer to move.
To the left until backing is complete.
Q.15
Submit
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.16
Submit
During a trip, the ____ should be open.
Rear service line shut-off valve
Rear supply line shut-off valve
Inner shut-off valves
Q.17
Submit
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.18
Submit
Pushing in the trailer air supply control will:
Supply the trailer with air.
Deactivate the air brakes.
Prevent the vehicle from skidding.
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
Place the trailer air supply control in its "emergency" position to test:
The trailer emergency brakes.
A coupling device.
The anti-lock brakes.
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