2026 Maine DMV Combination Class A Test 1 (20 Questions And Complete Answers)
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Place the trailer air supply control in its "emergency" position to test:
1. The trailer emergency brakes.
2. A coupling device.
3. The anti-lock brakes.
1. The trailer emergency brakes.
2. A coupling device.
3. The anti-lock brakes.
The trailer emergency brakes.
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
If a trailer begins to skid, it is best for the driver to:
1. Release the brakes.
2. Release the brakes.
3. Quickly turn the steering wheel in one direction, then in the other.
1. Release the brakes.
2. Release the brakes.
3. Quickly turn the steering wheel in one direction, then in the other.
Release the brakes.; Release the brakes.
To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:
1. Pump the air brakes to activate the ABS.
2. Look into the back of the fifth wheel.
3. Check for wheel speed sensors coming from the back of the brakes.
1. Pump the air brakes to activate the ABS.
2. Look into the back of the fifth wheel.
3. Check for wheel speed sensors coming from the back of the brakes.
Check for wheel speed sensors coming from the back of the brakes.
Shut-off valves:
1. Prevent air from escaping air brake systems.
2. Prevent air from entering air brake systems.
3. Override vehicles that are out of control.
1. Prevent air from escaping air brake systems.
2. Prevent air from entering air brake systems.
3. Override vehicles that are out of control.
Prevent air from escaping air brake systems.
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
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.
When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.
1. The Anti-Lock Braking System
2. The emergency braking system
3. The trailer service brakes
1. The Anti-Lock Braking System
2. The emergency braking system
3. The trailer service brakes
The trailer service brakes
Rollovers happen when:
1. You drive too slowly.
2. You are stopped.
3. You take a turn too fast.
1. You drive too slowly.
2. You are stopped.
3. You take a turn too fast.
You take a turn too fast.
What does an Anti-Lock Braking System (ABS) do?
1. It allows a vehicle's wheels to lock up.
2. It prevents a vehicle's wheels from locking up.
3. It makes turning a vehicle easier.
1. It allows a vehicle's wheels to lock up.
2. It prevents a vehicle's wheels from locking up.
3. It makes turning a vehicle easier.
It prevents a vehicle's wheels from locking up.
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