2026 Free California DMV Combination Class A CDL Test 1 (20 Questions And Complete Answers)
1 / 20
Terms in this set
20
A loss of air pressure in the emergency line will cause:
1. The suspension springs to extend.
2. The tractor protection valve to open.
3. The emergency brakes to activate.
1. The suspension springs to extend.
2. The tractor protection valve to open.
3. The emergency brakes to activate.
The emergency brakes to activate.
When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.
1. Level with
2. Slightly higher than
3. Slightly lower than
1. Level with
2. Slightly higher than
3. Slightly lower than
Slightly lower than
In a sudden turn, the ____ trailer is the most likely to turn over.
1. Front
2. Last
3. Middle
1. Front
2. Last
3. Middle
Last
After completing a pre-trip inspection, you should ensure that the:
1. Service line valve is closed.
2. Trailer hand brake is applied.
3. Emergency line valve is open.
1. Service line valve is closed.
2. Trailer hand brake is applied.
3. Emergency line valve is open.
Service line valve is closed.
All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).
1. 1943
2. 1998
3. 2009
1. 1943
2. 1998
3. 2009
1998
An air supply control lever should be in its "normal" position when you are:
1. Changing a tire.
2. Applying the trailer emergency brakes.
3. Pulling a trailer.
1. Changing a tire.
2. Applying the trailer emergency brakes.
3. Pulling a trailer.
Pulling a trailer.
How much space should be between the upper and lower fifth wheel?
1. About five inches of space
2. A maximum of two inches of space
3. No space
1. About five inches of space
2. A maximum of two inches of space
3. No space
No space
In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:
1. Air pressure drops to a level between 20 and 45 psi.
2. You are experiencing a trailer jackknife.
3. Wheels have regained traction after a skid.
1. Air pressure drops to a level between 20 and 45 psi.
2. You are experiencing a trailer jackknife.
3. Wheels have regained traction after a skid.
Air pressure drops to a level between 20 and 45 psi.
Which of the following will not help prevent a rig from rolling over?
1. Keeping the cargo as close to the ground as possible
2. Driving slowly around turns
3. Driving on the shoulder of a road
1. Keeping the cargo as close to the ground as possible
2. Driving slowly around turns
3. Driving on the shoulder of a road
Driving on the shoulder of a road
Push in the trailer air supply control to:
1. Activate the emergency brakes.
2. Deactivate the air brakes.
3. Supply the trailer with air.
1. Activate the emergency brakes.
2. Deactivate the air brakes.
3. Supply the trailer with air.
Supply the trailer with air.
Showing the first 10 terms. Use the flashcard player above to study all 20 terms!