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Driving Test
Utah
Utah 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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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.3
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Before a drive, ensure that air flows to all trailers by:
Opening the rear shut-off valves and listening for escaping air.
Closing the rear shut-off valves and listening for escaping air.
Disconnecting air supply lines and listening for escaping air.
Rolling each trailer down a hill and testing the brakes.
Q.4
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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.5
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To prevent a rollover, a driver should:
Keep cargo low.
Place cargo high.
Keep cargo loose.
Turn quickly.
Q.6
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An air supply control in its "emergency" position will:
Turn on the air supply.
Apply the trailer emergency brakes.
Prevent a skid.
Accelerate the vehicle.
Q.7
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Rollovers happen when:
Drivers turn too quickly.
Drivers turn too slowly.
It is raining.
Q.8
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What is off-tracking?
When a vehicle’s front wheels follow a different path than its rear wheels
When a vehicle's wheels all follow the exact same path
When a load shifts during a turn
When a vehicle's wheels run over a curb during a turn
Q.9
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When lightly loaded, combination vehicles:
Should not be driven.
Have reduced braking capabilities.
Will not rollover.
Should be loaded with most of the weight in the rear of the trailer.
Q.10
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When a vehicle goes around a corner, the rear wheels:
Follow the same path as the front wheels.
Follow a different path than the front wheels.
Should not be a concern to the driver.
Q.11
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During a trip, the ____ should be open.
Rear service line shut-off valve
Rear supply line shut-off valve
Inner shut-off valves
Q.12
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Compared to other commercial motor vehicles, combination vehicles need more space on the road because they are longer and they:
Need more space to turn and stop.
Drive more slowly.
Are twice the width.
Swerve more often.
Q.13
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Failure to keep the fifth wheel plate properly greased could:
Cause the trailer to disconnect.
Cause steering problems.
Cause braking problems.
Affect the lights.
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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When should the trailer hand valve be used?
Only when the trailer is carrying a load
Only to test the trailer’s brakes
Only in inclement weather when the trailer may skid
Q.16
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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.17
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If colors are being used to distinguish glad hands, which color is used for emergency lines?
Orange
Yellow
Blue
Red
Q.18
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If color-coded, which color is used to identify emergency, or supply, lines?
White
Yellow
Red
Q.19
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The trailer hand valve should not be used while you are driving because:
It will disconnect from the vehicle.
You will stop the vehicle too quickly.
It can cause a skid.
Q.20
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When a combination vehicle goes around a corner:
The vehicle must use at least two lanes.
The front and rear wheels will move in different paths.
It is best to allow the rear wheels to drive over the curb.
Q.21
Submit
A tractor protection valve is:
A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.
A device that prevents theft.
A device that controls fuel levels.
A device that allows the battery to recharge efficiently.
Q.22
Submit
The best way to recognize that your trailer has begun to skid is by:
Seeing other drivers' faces.
Seeing it in your mirrors.
Feeling it.
Listening to the radio.
Q.23
Submit
In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:
Air pressure drops to a level between 20 and 45 psi.
You are experiencing a trailer jackknife.
Wheels have regained traction after a skid.
Air pressure is above 45 psi.
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