2026 Minnesota DMV Combination Class A Test 2 (20 Questions And Complete Answers)
1 / 20
Terms in this set
20
Before a drive, ensure that air flows to all trailers by:
1. Opening the rear shut-off valves and listening for escaping air.
2. Closing the rear shut-off valves and listening for escaping air.
3. Disconnecting air supply lines and listening for escaping air.
4. Rolling each trailer down a hill and testing the brakes.
1. Opening the rear shut-off valves and listening for escaping air.
2. Closing the rear shut-off valves and listening for escaping air.
3. Disconnecting air supply lines and listening for escaping air.
4. Rolling each trailer down a hill and testing the brakes.
Opening the rear shut-off valves and listening for escaping air.
If a load is placed on one side of a trailer, the trailer:
1. May lean during turns.
2. May add extra support during turns.
3. May be easier to steer during turns.
1. May lean during turns.
2. May add extra support during turns.
3. May be easier to steer during turns.
May lean during turns.
When coupling:
1. You can assume all vehicles are the same.
2. Be sure that you are coupling correctly.
3. Cracks in the mounting are acceptable.
1. You can assume all vehicles are the same.
2. Be sure that you are coupling correctly.
3. Cracks in the mounting are acceptable.
Be sure that you are coupling correctly.
If a trailer begins to skid, the driver should:
1. Lock the brakes.
2. Release the brakes.
3. Steer in the opposite direction.
4. Accelerate.
1. Lock the brakes.
2. Release the brakes.
3. Steer in the opposite direction.
4. Accelerate.
Release the brakes.
Failure to keep the fifth wheel plate properly greased could:
1. Cause the trailer to disconnect.
2. Cause steering problems.
3. Cause braking problems.
4. Affect the lights.
1. Cause the trailer to disconnect.
2. Cause steering problems.
3. Cause braking problems.
4. Affect the lights.
Cause steering problems.
If a parked trailer does not have spring brakes, you should keep the trailer from moving by:
1. Having the vehicle parked against a wall or other vehicle.
2. Using chock blocks.
3. Parking on a slight incline.
1. Having the vehicle parked against a wall or other vehicle.
2. Using chock blocks.
3. Parking on a slight incline.
Using chock blocks.
If unsure if a trailer is equipped with ABS, you can:
1. Check under the trailer for wheel speed sensors coming from the back of the brakes.
2. Try driving on a slippery surface and see if ABS kicks in.
3. Assume it does have ABS.
4. Remove a tire and look for the ABS sensor on the axle.
1. Check under the trailer for wheel speed sensors coming from the back of the brakes.
2. Try driving on a slippery surface and see if ABS kicks in.
3. Assume it does have ABS.
4. Remove a tire and look for the ABS sensor on the axle.
Check under the trailer for wheel speed sensors coming from the back of the brakes.
If an air supply control is in its "emergency" position:
1. The vehicle will increase speed.
2. The trailer emergency brakes will be applied.
3. The air supply to the trailer will increase.
1. The vehicle will increase speed.
2. The trailer emergency brakes will be applied.
3. The air supply to the trailer will increase.
The trailer emergency brakes will be applied.
If you press the tractor air supply control and your trailer's spring brakes do not release, you should:
1. Inspect the air line connections.
2. Activate the Anti-Lock Braking System.
3. Turn the engine off and on again.
1. Inspect the air line connections.
2. Activate the Anti-Lock Braking System.
3. Turn the engine off and on again.
Inspect the air line connections.
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.
4. Air pressure is above 45 psi.
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.
4. Air pressure is above 45 psi.
Air pressure drops to a level between 20 and 45 psi.
Showing the first 10 terms. Use the flashcard player above to study all 20 terms!