2026 Free Alabama DMV Class A CDL Combination Test 2 (20 Questions And Complete Answers)
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The service air line is often controlled by the foot brake and is attached to the ____ valves.
1. Relay
2. Supply
3. Emergency
1. Relay
2. Supply
3. Emergency
Relay
When coupling, after you've connected the air lines to the trailer, you should:
1. Supply air to the trailer.
2. Activate the emergency brake.
3. Disconnect the glad hands.
1. Supply air to the trailer.
2. Activate the emergency brake.
3. Disconnect the glad hands.
Supply air to the trailer.
While inspecting a coupling, you should go under the trailer and:
1. Detach the jaws from around the kingpin.
2. Make sure the locking lever is in the "emergency" position.
3. Remove the safety latch.
4. Look into the back of the fifth wheel.
1. Detach the jaws from around the kingpin.
2. Make sure the locking lever is in the "emergency" position.
3. Remove the safety latch.
4. Look into the back of the fifth wheel.
Look into the back of the fifth wheel.
In a sudden turn, the ____ trailer is the most likely to turn over.
1. Front
2. Last
3. Middle
4. First
1. Front
2. Last
3. Middle
4. First
Last
Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
1. The trailer will stop normally.
2. The trailer will not have brakes.
3. The trailer will speed up.
1. The trailer will stop normally.
2. The trailer will not have brakes.
3. The trailer will speed up.
The trailer will not have brakes.
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 rear trailer to detach from the combination.
4. The emergency brakes to activate.
1. The suspension springs to extend.
2. The tractor protection valve to open.
3. The rear trailer to detach from the combination.
4. The emergency brakes to activate.
The emergency brakes to activate.
In a double or triple combination, the ____ trailer should be directly behind the cab.
1. Lightest
2. Heaviest
3. Smallest
1. Lightest
2. Heaviest
3. Smallest
Heaviest
When driving a vehicle equipped with an Anti-Lock Braking System (ABS), brakes should be applied:
1. In the same way as they would be in a vehicle without ABS.
2. As the vehicle is placed in neutral.
3. With the hand brake.
1. In the same way as they would be in a vehicle without ABS.
2. As the vehicle is placed in neutral.
3. With the hand brake.
In the same way as they would be in a vehicle without ABS.
In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:
1. 20 and 45 psi.
2. 75 and 105 psi.
3. 50 and 65 psi.
1. 20 and 45 psi.
2. 75 and 105 psi.
3. 50 and 65 psi.
20 and 45 psi.
Proper coupling technique:
1. Is the same on all vehicles.
2. Is essential to the safe operation of a vehicle.
3. Includes ensuring that the fifth wheel plate is not greased.
4. Can be learned over time.
1. Is the same on all vehicles.
2. Is essential to the safe operation of a vehicle.
3. Includes ensuring that the fifth wheel plate is not greased.
4. Can be learned over time.
Is essential to the safe operation of a vehicle.
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