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California
California CDL Combination 1
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Q.1
Submit
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.2
Submit
A loss of air pressure in the emergency line will cause:
The suspension springs to extend.
The tractor protection valve to open.
The emergency brakes to activate.
Q.3
Submit
When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.
Level with
Slightly higher than
Slightly lower than
Q.4
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In a sudden turn, the ____ trailer is the most likely to turn over.
Front
Last
Middle
Q.5
Submit
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.6
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All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).
1943
1998
2009
Q.7
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An air supply control lever should be in its "normal" position when you are:
Changing a tire.
Applying the trailer emergency brakes.
Pulling a trailer.
Q.8
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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.
Q.9
Submit
Which of the following will not help prevent a rig from rolling over?
Keeping the cargo as close to the ground as possible
Driving slowly around turns
Driving on the shoulder of a road
Q.10
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Push in the trailer air supply control to:
Activate the emergency brakes.
Deactivate the air brakes.
Supply the trailer with air.
Q.11
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To test the trailer service brakes, you should:
Move the vehicle forward slowly and apply the brakes with the brake pedal.
Reverse the vehicle slowly and apply the brakes with the hand control.
Move the vehicle forward slowly and apply the brakes with the hand control.
Q.12
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.13
Submit
Operating combination vehicles usually requires ____ operating single vehicles.
Less skill than
About the same level of skill as
More skill than
Q.14
Submit
To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:
Pump the air brakes to activate the ABS.
Look into the back of the fifth wheel.
Check for wheel speed sensors coming from the back of the brakes.
Q.15
Submit
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
Submit
The emergency air line supplies air to the:
Relay valves.
Trailer air tanks.
Signal line.
Q.17
Submit
The ____ trailer is the most likely to turn over if a driver takes a turn too quickly.
Front
Last
Middle
Q.18
Submit
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.19
Submit
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
Submit
Keeping cargo centered on a rig can:
Help you drive faster.
Prevent a rollover.
Make turns more dangerous.
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